CVE-2021-39300

Q: What is the severity of CVE-2021-39300?

CVE-2021-39300 has a CVSS score of 8.8 (HIGH). This CVE describes UEFI firmware vulnerabilities in certain HP PC products that could allow attackers to execute arbitrary code with elevated privileges. The vulnerability affects the system's BIOS/firmware layer, potentially compromising the entire system before the operating system loads. Only specific HP PC models with vulnerable UEFI firmware are affected.

8.8 HIGH

📋 TL;DR

This CVE describes UEFI firmware vulnerabilities in certain HP PC products that could allow attackers to execute arbitrary code with elevated privileges. The vulnerability affects the system's BIOS/firmware layer, potentially compromising the entire system before the operating system loads. Only specific HP PC models with vulnerable UEFI firmware are affected.

💻 Affected Systems

Products:

HP PC products with vulnerable UEFI firmware

Versions: Specific firmware versions not detailed in references

Operating Systems: All operating systems running on affected hardware

Default Config Vulnerable: ⚠️ Yes

Notes: Vulnerability exists at firmware level, so OS configuration doesn't matter. Only specific HP PC models are affected.

📦 What is this software?

Eliteone 800 G4 23.8 In Healthcare Edition All In One Business Pc Firmware by Hp

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Eliteone 800 G4 23.8 Inch Non Touch All In One Pc Firmware by Hp

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Eliteone 800 G4 23.8 Inch Non Touch Gpu All In One Pc Firmware by Hp

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Eliteone 800 G4 23.8 Inch Touch All In One Pc Firmware by Hp

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Eliteone 800 G4 23.8 Inch Touch Gpu All In One Pc Firmware by Hp

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Eliteone 800 G5 23.8 In Healthcare Edition All In One Firmware by Hp

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Eliteone 800 G5 23.8 Inch All In One Firmware by Hp

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Eliteone 800 G6 24 All In One Pc Firmware by Hp

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Eliteone 800 G6 27 All In One Pc Firmware by Hp

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Eliteone 800 G8 24 All In One Pc Firmware by Hp

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Eliteone 800 G8 27 All In One Pc Firmware by Hp

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Engage Flex Mini Retail System Firmware by Hp

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Mp9 G4 Retail System Firmware by Hp

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Probook 430 G5 Firmware by Hp

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Probook 430 G6 Firmware by Hp

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Probook 430 G7 Firmware by Hp

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Probook 430 G8 Firmware by Hp

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Probook 440 G5 Firmware by Hp

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Probook 440 G6 Firmware by Hp

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Probook 440 G7 Firmware by Hp

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Probook 440 G8 Firmware by Hp

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Probook 450 G5 Firmware by Hp

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Probook 450 G6 Firmware by Hp

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Probook 450 G7 Firmware by Hp

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Probook 450 G8 Firmware by Hp

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Probook 470 G5 Firmware by Hp

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Probook 630 G8 Firmware by Hp

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Probook 640 G4 Firmware by Hp

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Probook 640 G5 Firmware by Hp

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Probook 640 G7 Firmware by Hp

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Probook 640 G8 Firmware by Hp

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Probook 650 G4 Firmware by Hp

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Probook 650 G5 Firmware by Hp

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Probook 650 G7 Firmware by Hp

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Probook 650 G8 Firmware by Hp

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Probook X360 11 G3 Education Edition Firmware by Hp

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Probook X360 11 G4 Education Edition Firmware by Hp

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Probook X360 11 G5 Education Edition Firmware by Hp

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Probook X360 11 G6 Education Edition Firmware by Hp

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Probook X360 11 G7 Education Edition Firmware by Hp

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Probook X360 440 G1 Firmware by Hp

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Prodesk 400 G4 Desktop Mini Pc Firmware by Hp

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Prodesk 400 G5 Desktop Mini Pc Firmware by Hp

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Prodesk 400 G5 Microtower Pc Firmware by Hp

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Prodesk 400 G5 Small Form Factor Pc Firmware by Hp

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Prodesk 400 G6 Desktop Mini Pc Firmware by Hp

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Prodesk 400 G6 Microtower Pc Firmware by Hp

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Prodesk 400 G6 Small Form Factor Pc Firmware by Hp

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Prodesk 400 G7 Microtower Pc Firmware by Hp

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Prodesk 400 G7 Small Form Factor Pc Firmware by Hp

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Prodesk 405 G8 Desktop Mini Pc Firmware by Hp

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Prodesk 405 G8 Small Form Factor Pc Firmware by Hp

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Prodesk 480 G5 Microtower Pc Firmware by Hp

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Prodesk 480 G6 Microtower Pc Firmware by Hp

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Prodesk 480 G7 Pci Microtower Pc Firmware by Hp

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Prodesk 600 G4 Desktop Mini Pc Firmware by Hp

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Prodesk 600 G4 Microtower Pc \(with Pci Slot\) Firmware by Hp

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Prodesk 600 G4 Microtower Pc Firmware by Hp

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Prodesk 600 G4 Small Form Factor Pc Firmware by Hp

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Prodesk 600 G5 Desktop Mini Pc Firmware by Hp

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Prodesk 600 G5 Microtower Pc \(with Pci Slot\) Firmware by Hp

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Prodesk 600 G5 Microtower Pc Firmware by Hp

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Prodesk 600 G5 Small Form Factor Pc Firmware by Hp

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Prodesk 600 G6 Desktop Mini Pc Firmware by Hp

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Prodesk 600 G6 Microtower Pc Firmware by Hp

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Prodesk 600 G6 Small Form Factor Pc Firmware by Hp

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Prodesk 680 G4 Microtower Pc \(with Pci Slot\) Firmware by Hp

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Prodesk 680 G4 Microtower Pc Firmware by Hp

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Prodesk 680 G6 Pci Microtower Pc Firmware by Hp

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Proone 400 G4 20 Inch Non Touch All In One Business Pc Firmware by Hp

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Proone 400 G4 23.8 Inch Non Touch All In One Business Pc Firmware by Hp

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Proone 400 G5 20 Inch All In One Business Pc Firmware by Hp

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Proone 400 G5 23.8 Inch All In One Business Pc Firmware by Hp

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Proone 400 G6 20 All In One Pc Firmware by Hp

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Proone 400 G6 24 All In One Pc Firmware by Hp

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Proone 440 G4 23.8 Inch Non Touch All In One Business Pc Firmware by Hp

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Proone 440 G5 23.8 In All In One Business Pc Firmware by Hp

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Proone 440 G6 24 All In One Pc Firmware by Hp

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Proone 600 G4 21.5 Inch Touch All In One Business Pc Firmware by Hp

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Proone 600 G5 21.5 In All In One Business Pc Firmware by Hp

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Proone 600 G6 22 All In One Pc Firmware by Hp

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Z1 Entry Tower G5 Workstation Firmware by Hp

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Z1 Entry Tower G6 Workstation Firmware by Hp

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Z1 G8 Tower Desktop Pc Firmware by Hp

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Z4 G4 Workstation \(core X\) Firmware by Hp

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Z4 G4 Workstation \(core X\) Firmware by Hp

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Z4 G4 Workstation \(core X\) Firmware by Hp

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Z4 G4 Workstation \(xeon W\) Firmware by Hp

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Z4 G4 Workstation \(xeon W\) Firmware by Hp

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Z4 G4 Workstation \(xeon W\) Firmware by Hp

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Z6 G4 Workstation Firmware by Hp

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Z6 G4 Workstation Firmware by Hp

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Z6 G4 Workstation Firmware by Hp

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Z8 G4 Workstation Firmware by Hp

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Z8 G4 Workstation Firmware by Hp

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Z8 G4 Workstation Firmware by Hp

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Zbook 14u G5 Firmware by Hp

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Zbook 14u G6 Firmware by Hp

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Zbook 15 G5 Firmware by Hp

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Zbook 15 G6 Firmware by Hp

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Zbook 15u G5 Firmware by Hp

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Zbook 15u G6 Firmware by Hp

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Zbook 17 G5 Firmware by Hp

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Zbook 17 G6 Firmware by Hp

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Zbook Create G7 Firmware by Hp

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Zbook Firefly 14 G7 Firmware by Hp

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Zbook Firefly 14 G8 Firmware by Hp

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Zbook Firefly 15 G7 Firmware by Hp

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Zbook Firefly 15 G8 Firmware by Hp

View all CVEs affecting Zbook Firefly 15 G8 Firmware →

Zbook Fury 15 G7 Firmware by Hp

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Zbook Fury 15 G8 Firmware by Hp

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Zbook Fury 17 G7 Firmware by Hp

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Zbook Fury 17 G8 Firmware by Hp

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Zbook Power 15 G8 Firmware by Hp

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Zbook Power G7 Firmware by Hp

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Zbook Studio 15 G8 Firmware by Hp

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Zbook Studio G5 Firmware by Hp

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Zbook Studio G7 Firmware by Hp

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Zbook Studio X360 G5 Firmware by Hp

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Zhan 66 Pro 13 G2 Firmware by Hp

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Zhan 66 Pro 14 G2 Firmware by Hp

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Zhan 66 Pro 14 G3 Firmware by Hp

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Zhan 66 Pro 14 G4 Firmware by Hp

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Zhan 66 Pro 15 G2 Firmware by Hp

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Zhan 66 Pro 15 G3 Firmware by Hp

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Zhan 66 Pro G1 Firmware by Hp

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Zhan 66 Pro G3 22 All In One Pc Firmware by Hp

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Zhan 66 Pro G3 24 All In One Pc Firmware by Hp

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Zhan X 13 G2 Firmware by Hp

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⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete system compromise with persistent malware that survives OS reinstallation and disk formatting, allowing attackers to maintain long-term access and control over the device.

🟠

Likely Case

Local privilege escalation allowing attackers to bypass security controls, install persistent malware, or access sensitive system resources.

🟢

If Mitigated

Limited impact if physical access controls are strong and users have limited privileges, though firmware-level attacks remain difficult to detect.

🌐 Internet-Facing: LOW

🏢 Internal Only: HIGH

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: HIGH

Firmware exploitation typically requires local access and specialized knowledge. No public exploit code is mentioned in the references.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Updated UEFI firmware versions from HP

Vendor Advisory: https://support.hp.com/us-en/document/ish_5661066-5661090-16

Restart Required: Yes

Instructions:

1. Visit HP Support website. 2. Enter your HP PC model. 3. Download latest UEFI firmware update. 4. Run the update utility. 5. Restart system as prompted.

🔧 Temporary Workarounds

Physical Security Controls

all

Restrict physical access to vulnerable systems to prevent local exploitation

Secure Boot Enforcement

all

Enable and enforce Secure Boot in UEFI settings to prevent unauthorized firmware modifications

🧯 If You Can't Patch

Isolate affected systems from critical networks and sensitive data
Implement strict physical access controls and monitoring for affected devices

🔍 How to Verify

Check if Vulnerable:

Check HP Support site with your PC model to see if it's listed as affected

Check Version:

Windows: wmic bios get smbiosbiosversion
Linux: sudo dmidecode -s bios-version

Verify Fix Applied:

Check UEFI firmware version in BIOS settings matches latest version from HP Support

📡 Detection & Monitoring

Log Indicators:

Unexpected BIOS/UEFI firmware modification events
System boot anomalies

Network Indicators:

Unusual outbound connections during boot process

SIEM Query:

EventID=12 OR EventID=13 (System boot events) with suspicious details

📊 Metadata

CVE ID: CVE-2021-39300

CVSS v3 Score: 8.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Published: February 16, 2022

Last Updated: November 21, 2024

🔗 References

https://support.hp.com/us-en/document/ish_5661066-5661090-16 Patch,Vendor Advisory
https://support.hp.com/us-en/document/ish_5661066-5661090-16 Patch,Vendor Advisory

📋 TL;DR

💻 Affected Systems

📦 What is this software?

260 G3 Desktop Mini Pc Firmware by Hp

Elite Dragonfly Firmware by Hp

Elite Dragonfly G2 Firmware by Hp

Elite Dragonfly Max Firmware by Hp

Elite X2 1013 G3 Firmware by Hp

Elite X2 G4 Firmware by Hp

Elite X2 G8 Tablet Firmware by Hp

Elitebook 1050 G1 Firmware by Hp

Elitebook 830 G5 Firmware by Hp

Elitebook 830 G6 Firmware by Hp

Elitebook 830 G7 Firmware by Hp

Elitebook 830 G8 Firmware by Hp

Elitebook 836 G5 Firmware by Hp

Elitebook 836 G6 Firmware by Hp

Elitebook 840 Aero G8 Firmware by Hp

Elitebook 840 G5 Firmware by Hp

Elitebook 840 G5 Healthcare Edition Firmware by Hp

Elitebook 840 G6 Firmware by Hp

Elitebook 840 G6 Healthcare Edition Firmware by Hp

Elitebook 840 G7 Firmware by Hp

Elitebook 840 G8 Firmware by Hp

Elitebook 840r G4 Firmware by Hp

Elitebook 846 G5 Firmware by Hp

Elitebook 850 G5 Firmware by Hp

Elitebook 850 G6 Firmware by Hp

Elitebook 850 G7 Firmware by Hp

Elitebook 850 G8 Firmware by Hp

Elitebook X360 1030 G3 Firmware by Hp

Elitebook X360 1030 G4 Firmware by Hp

Elitebook X360 1030 G7 Firmware by Hp

Elitebook X360 1030 G8 Firmware by Hp

Elitebook X360 1040 G5 Firmware by Hp

Elitebook X360 1040 G6 Firmware by Hp

Elitebook X360 1040 G7 Firmware by Hp

Elitebook X360 1040 G8 Firmware by Hp

Elitebook X360 830 G5 Firmware by Hp

Elitebook X360 830 G6 Firmware by Hp

Elitebook X360 830 G7 Firmware by Hp

Elitebook X360 830 G8 Firmware by Hp

Elitedesk 800 35w G4 Desktop Mini Pc Firmware by Hp

Elitedesk 800 65w G4 Desktop Mini Pc Firmware by Hp

Elitedesk 800 95w G4 Desktop Mini Pc Firmware by Hp

Elitedesk 800 G4 Small Form Factor Pc Firmware by Hp

Elitedesk 800 G4 Tower Pc Firmware by Hp

Elitedesk 800 G4 Tower Pc Firmware by Hp

Elitedesk 800 G4 Workstation Edition Firmware by Hp

Elitedesk 800 G5 Desktop Mini Pc Firmware by Hp

Elitedesk 800 G5 Small Form Factor Pc Firmware by Hp

Elitedesk 800 G5 Tower Pc Firmware by Hp

Elitedesk 800 G6 Desktop Mini Pc Firmware by Hp

Elitedesk 800 G6 Small Form Factor Pc Firmware by Hp

Elitedesk 800 G6 Tower Pc Firmware by Hp

Elitedesk 800 G8 Desktop Mini Pc Firmware by Hp

Elitedesk 800 G8 Small Form Factor Pc Firmware by Hp

Elitedesk 800 G8 Tower Pc Firmware by Hp

Elitedesk 805 G6 Desktop Mini Pc Firmware by Hp

Elitedesk 805 G6 Small Form Factor Pc Firmware by Hp

Elitedesk 805 G8 Desktop Mini Pc Firmware by Hp

Elitedesk 805 G8 Small Form Factor Pc Firmware by Hp

Elitedesk 880 G4 Tower Pc Firmware by Hp

Elitedesk 880 G5 Tower Pc Firmware by Hp

Elitedesk 880 G6 Tower Pc Firmware by Hp

Elitedesk 880 G8 Tower Pc Firmware by Hp

Eliteone 1000 G2 23.8 In All In One Business Pc Firmware by Hp

Eliteone 1000 G2 23.8 In Touch All In One Business Pc Firmware by Hp

Eliteone 1000 G2 27 In 4k Uhd All In One Business Pc Firmware by Hp

Eliteone 1000 G2 34 In Curved All In One Business Pc Firmware by Hp

Eliteone 800 G4 23.8 In Healthcare Edition All In One Business Pc Firmware by Hp

Eliteone 800 G4 23.8 Inch Non Touch All In One Pc Firmware by Hp

Eliteone 800 G4 23.8 Inch Non Touch Gpu All In One Pc Firmware by Hp

Eliteone 800 G4 23.8 Inch Touch All In One Pc Firmware by Hp

Eliteone 800 G4 23.8 Inch Touch Gpu All In One Pc Firmware by Hp

Eliteone 800 G5 23.8 In Healthcare Edition All In One Firmware by Hp

Eliteone 800 G5 23.8 Inch All In One Firmware by Hp

Eliteone 800 G6 24 All In One Pc Firmware by Hp

Eliteone 800 G6 27 All In One Pc Firmware by Hp

Eliteone 800 G8 24 All In One Pc Firmware by Hp