CVE-2023-53879 – NVClient 5.0 contains a stack buffer overflow v... (How to Fix)

Q: What is the severity of CVE-2023-53879?

CVE-2023-53879 has a CVSS score of 5.5 (MEDIUM). NVClient 5.0 contains a stack buffer overflow vulnerability in the user configuration contact field. Attackers can crash the application by pasting a crafted payload into the contact box, causing a denial of service condition. This affects users of NVClient 5.0 video surveillance management software.

📋 TL;DR

NVClient 5.0 contains a stack buffer overflow vulnerability in the user configuration contact field. Attackers can crash the application by pasting a crafted payload into the contact box, causing a denial of service condition. This affects users of NVClient 5.0 video surveillance management software.

💻 Affected Systems

Products:

NVClient

Versions: 5.0

Operating Systems: Windows

Default Config Vulnerable: ⚠️ Yes

Notes: Vulnerability exists in the user configuration contact field; exploitation requires user interaction to paste payload.

📦 What is this software?

Nvclient by Eyemaxsystems

View all CVEs affecting Nvclient →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete application crash leading to denial of service, potentially disrupting video surveillance monitoring capabilities.

🟠

Likely Case

Application crash requiring restart, causing temporary loss of surveillance monitoring.

🟢

If Mitigated

Minimal impact if application is isolated and restarts automatically.

🌐 Internet-Facing: MEDIUM - Requires user interaction with the vulnerable field, but could be exploited if application is exposed.

🏢 Internal Only: MEDIUM - Still requires user interaction but could be exploited by malicious insiders or through social engineering.

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ✅ No

Complexity: LOW

Exploit requires user to paste crafted payload into contact field; public exploit code is available.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Unknown

Vendor Advisory: No vendor advisory found

Restart Required: No

Instructions:

No official patch available. Check vendor website for updates or consider workarounds.

🔧 Temporary Workarounds

Input Validation

all

Implement strict input validation on the contact field to limit length and character types.

Application Isolation

windows

Run NVClient in isolated environment with limited privileges to contain crashes.

🧯 If You Can't Patch

Restrict user access to configuration interface
Implement network segmentation to isolate NVClient systems

🔍 How to Verify

Check if Vulnerable:

Check if running NVClient version 5.0. Attempt to paste long string (>846 chars) into contact field to test for crash.

Check Version:

Check Help > About in NVClient application

Verify Fix Applied:

Verify updated version number or test with payload that previously caused crash.

📡 Detection & Monitoring

Log Indicators:

Application crash logs
Unexpected termination events

Network Indicators:

Unusual traffic to/from NVClient systems

SIEM Query:

EventID=1000 OR EventID=1001 Source='NVClient.exe'

📊 Metadata

CVE ID: CVE-2023-53879

CVSS v3 Score: 5.5 (MEDIUM)

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

CWE: CWE-121

EPSS Score: 0.02% exploit probability (2.7th percentile)

Published: December 15, 2025

Last Updated: December 18, 2025

🔗 References

http://download.eyemaxdvr.com/DVST%20ST%20SERIES/CMS/Video%20Surveillance%20Management%20Software(V5.0).pdf Product
https://www.exploit-db.com/exploits/51700 Exploit,Third Party Advisory
https://www.vulncheck.com/advisories/nvclient-stack-buffer-overflow-vulnerability-via-user-configuration Third Party Advisory
http://download.eyemaxdvr.com/DVST%20ST%20SERIES/CMS/Video%20Surveillance%20Management%20Software(V5.0).pdf Product
https://www.exploit-db.com/exploits/51700 Exploit,Third Party Advisory

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