CVE-2025-27091— Cisco OpenH264 安全漏洞
一分钟漏洞结论
影响对象
cisco openh264
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Cisco OpenH264是美国思科（Cisco）公司的一个开源 H.264 编解码器。 Cisco OpenH264 2.5.0及之前版本存在安全漏洞，该漏洞源于SPS内存分配存在竞争条件，会导致堆溢出及远程代码执行。
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一、 漏洞 CVE-2025-27091 基础信息
漏洞信息
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Vulnerability Title
OpenH264 Decoding Functions Heap Overflow Vulnerability
来源: CVE Program / CVE List V5
Vulnerability 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)
来源: CVE Program / CVE List V5
CVSS Information
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
来源: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
来源: CVE Program / CVE List V5
Vulnerability Title
Cisco OpenH264 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Cisco OpenH264是美国思科（Cisco）公司的一个开源 H.264 编解码器。 Cisco OpenH264 2.5.0及之前版本存在安全漏洞，该漏洞源于SPS内存分配存在竞争条件，会导致堆溢出及远程代码执行。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2025-27091 的公开POC
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CVE-2025-27091 补丁与修复 (1)
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Release Release Version 2.6.0 · cisco/openh264 · GitHub x_refsource_MISC
CVE-2025-27091 厂商安全公告 (1)
IV. Related Vulnerabilities
V. Comments for CVE-2025-27091
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