- Description
- OpenH264 is a free license codec library which supports H.264 encoding and decoding. A vulnerability in the decoding functions of OpenH264 codec library could allow a remote, unauthenticated attacker to trigger a heap overflow. This vulnerability is due to a race condition between a Sequence Parameter Set (SPS) memory allocation and a subsequent non Instantaneous Decoder Refresh (non-IDR) Network Abstraction Layer (NAL) unit memory usage. An attacker could exploit this vulnerability by crafting a malicious bitstream and tricking a victim user into processing an arbitrary video containing the malicious bistream. An exploit could allow the attacker to cause an unexpected crash in the victim's user decoding client and, possibly, perform arbitrary commands on the victim's host by abusing the heap overflow. This vulnerability affects OpenH264 2.5.0 and earlier releases. Both Scalable Video Coding (SVC) mode and Advanced Video Coding (AVC) mode are affected by this vulnerability. OpenH264 software releases 2.6.0 and later contained the fix for this vulnerability. Users are advised to upgrade. There are no known workarounds for this vulnerability. ### For more information If you have any questions or comments about this advisory: * [Open an issue in cisco/openh264](https://github.com/cisco/openh264/issues) * Email Cisco Open Source Security ([oss-security@cisco.com](mailto:oss-security@cisco.com)) and Cisco PSIRT ([psirt@cisco.com](mailto:psirt@cisco.com)) ### Credits: * **Research:** Octavian Guzu and Andrew Calvano of Meta * **Fix ideation:** Philipp Hancke and Shyam Sadhwani of Meta * **Fix implementation:** Benzheng Zhang (@BenzhengZhang) * **Release engineering:** Benzheng Zhang (@BenzhengZhang)
- Source
- security-advisories@github.com
- NVD status
- Received
CVSS 4.0
- Type
- Secondary
- Base score
- 8.6
- Impact score
- -
- Exploitability score
- -
- Vector string
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Severity
- HIGH
- security-advisories@github.com
- CWE-122
Hype score is a measure of social media activity compared against trending CVEs from the past 12 months. Max score 100.
- Hype score
1
Dear @firefox @brave will u bring a fix to the CVE-2025-27091 issue? (instead of deactivating the codec)
@Quantumbux
23 Feb 2025
10 Impressions
0 Retweets
0 Likes
0 Bookmarks
0 Replies
0 Quotes
Two things you should know about CVE-2025-27091: 🚀 The vulnerability is a heap overflow, which can lead to code execution (but no public exploit... yet). 🚀 H.264 is the most popular codec for video files on the internet. CVSS4.0: 8.6
@it4sec
21 Feb 2025
638 Impressions
2 Retweets
9 Likes
3 Bookmarks
0 Replies
0 Quotes
⚠️ Vulnerability Alert: OpenH264 Decoding Functions Heap Overflow Vulnerability 📅 Timeline: Disclosure: 2025-02-20 Patch: 2025-02-06 📌 Attribution: Identified by Octavian Guzu and Andrew Calvano of Meta. 🆔 cveId: CVE-2025-27091 📊 baseScore: 8.6 📏 cvssMetrics:… https://t
@syedaquib77
21 Feb 2025
30 Impressions
0 Retweets
0 Likes
0 Bookmarks
0 Replies
0 Quotes
New post from https://t.co/uXvPWJy6tj (CVE-2025-27091 | Cisco OpenH264 up to 2.5.x Decoding heap-based overflow (GHSA-m99q-5j7x-7m9x)) has been published on https://t.co/Svvb4lMG4L
@WolfgangSesin
20 Feb 2025
11 Impressions
0 Retweets
0 Likes
0 Bookmarks
0 Replies
0 Quotes
New post from https://t.co/uXvPWJy6tj (CVE-2025-27091 | Cisco OpenH264 up to 2.5.x Decoding heap-based overflow (GHSA-m99q-5j7x-7m9x)) has been published on https://t.co/CsfItL5DRQ
@WolfgangSesin
20 Feb 2025
13 Impressions
0 Retweets
0 Likes
0 Bookmarks
0 Replies
0 Quotes
CVE-2025-27091 OpenH264 is a free license codec library which supports H.264 encoding and decoding. A vulnerability in the decoding functions of OpenH264 codec library could allow a… https://t.co/GO6a24ylX5
@CVEnew
20 Feb 2025
310 Impressions
0 Retweets
0 Likes
1 Bookmark
0 Replies
0 Quotes
[CVE-2025-27091: HIGH] Vulnerability in OpenH264 codec library allows remote attackers to exploit heap overflow. Upgrade to version 2.6.0+ to fix this issue. No known workarounds available. More info at cisco/ope...#cybersecurity,#vulnerability https://t.co/FIO2TX3IPz https://t.c
@CveFindCom
20 Feb 2025
6 Impressions
0 Retweets
0 Likes
0 Bookmarks
0 Replies
0 Quotes