CVE-2025-21487

Q: What is the severity of CVE-2025-21487?

CVE-2025-21487 has a CVSS score of 8.2 (HIGH). This vulnerability allows attackers to read sensitive information from memory when User Equipment (UE) processes malformed RTP packets with manipulated payload length fields. It affects devices using Qualcomm chipsets with vulnerable RTP decoding implementations. The information disclosure could expose network data, session information, or other sensitive memory contents.

8.2 HIGH

📋 TL;DR

This vulnerability allows attackers to read sensitive information from memory when User Equipment (UE) processes malformed RTP packets with manipulated payload length fields. It affects devices using Qualcomm chipsets with vulnerable RTP decoding implementations. The information disclosure could expose network data, session information, or other sensitive memory contents.

💻 Affected Systems

Products:

Qualcomm chipsets with vulnerable RTP implementations

Versions: Specific versions not publicly detailed; refer to Qualcomm September 2025 security bulletin

Operating Systems: Android and other OS using affected Qualcomm components

Default Config Vulnerable: ⚠️ Yes

Notes: Affects RTP packet processing in UE (User Equipment) implementations. Exact product list requires checking Qualcomm's security bulletin.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete memory dump of sensitive data including authentication credentials, session keys, or proprietary information leading to full system compromise.

🟠

Likely Case

Limited information disclosure exposing network configuration data, partial session information, or adjacent memory contents.

🟢

If Mitigated

No data exposure if proper bounds checking is implemented or vulnerable components are isolated.

🌐 Internet-Facing: MEDIUM - Requires sending specially crafted RTP packets to vulnerable endpoints, which may be exposed in certain network configurations.

🏢 Internal Only: HIGH - Internal network attackers could exploit this to gather intelligence about network infrastructure and connected devices.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Exploitation requires sending malformed RTP packets to vulnerable endpoints. No public exploit code available as of current information.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Refer to Qualcomm September 2025 security bulletin for specific patched versions

Vendor Advisory: https://docs.qualcomm.com/product/publicresources/securitybulletin/september-2025-bulletin.html

Restart Required: Yes

Instructions:

1. Check Qualcomm security bulletin for affected chipset versions. 2. Obtain firmware/software updates from device manufacturer. 3. Apply updates following manufacturer instructions. 4. Reboot affected devices.

🔧 Temporary Workarounds

Network filtering

all

Implement network filtering to block or inspect RTP packets with suspicious payload length values

Isolate vulnerable devices

all

Segment network to limit exposure of vulnerable devices to untrusted networks

🧯 If You Can't Patch

Implement strict network segmentation to isolate vulnerable devices
Deploy network monitoring for anomalous RTP traffic patterns

🔍 How to Verify

Check if Vulnerable:

Check device chipset version against Qualcomm's security bulletin. No public vulnerability scanner available.

Check Version:

Device-specific commands vary by manufacturer; typically 'getprop' on Android or manufacturer-specific diagnostic tools

Verify Fix Applied:

Verify firmware/software version has been updated to patched version specified in Qualcomm bulletin.

📡 Detection & Monitoring

Log Indicators:

RTP decoding errors
Memory access violations in RTP processing
Unusual packet size anomalies

Network Indicators:

RTP packets with payload length exceeding typical values
Malformed RTP header patterns

SIEM Query:

Search for RTP protocol anomalies with payload length field values exceeding expected ranges

📊 Metadata

CVE ID: CVE-2025-21487

CVSS v3 Score: 8.2 (HIGH)

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

CWE: CWE-126

EPSS Score: 0.04% exploit probability (12.2th percentile)

Published: September 24, 2025

Last Updated: November 28, 2025

🔗 References

https://docs.qualcomm.com/product/publicresources/securitybulletin/september-2025-bulletin.html Vendor Advisory

📋 TL;DR

💻 Affected Systems

📦 What is this software?

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