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How the CVE Works
CVE-2025-21006 is an out-of-bounds write vulnerability in the `libsavsvc.so` library affecting Android versions prior to Android 15. The flaw occurs during the processing of macro blocks in the MPEG4 codec, where improper bounds checking allows a local attacker to write data beyond allocated memory boundaries. This can lead to arbitrary code execution, memory corruption, or crashes. The vulnerability is exploitable via a maliciously crafted video file processed by the affected library.
DailyCVE Form
Platform: Android
Version: Pre-15
Vulnerability: Out-of-bounds write
Severity: Critical
Date: 07/15/2025
Prediction: Patch by 09/2025
What Undercode Say
Check vulnerable library adb shell ls /system/lib/libsavsvc.so Debug crash logs adb logcat | grep -i "savsvc" Fuzzing command (PoC) ffmpeg -i malformed.mp4 -c copy output.avi
How Exploit
- Crafted MPEG4 file triggers OOB write
- Exploitable via malicious app or media playback
- Leads to RCE or privilege escalation
Protection from this CVE
- Update to Android 15
- Disable untrusted media sources
- Apply vendor patches
Impact
- Arbitrary code execution
- System compromise
- Denial of Service
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
