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CVE-2026-121625— GNU Gatekeeper before 5.16 Out-of-Bounds Read via RTCP SDES Parsing

Quick assessment

Affected
willamowius gnugk
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 5.16 版本之前的 GNU Gatekeeper（gnugk）中， 文件中的 函数存在一个越界读取漏洞。该漏洞允许远程 RTP 对等方读取接收到的数据包之后的堆内存。攻击者可以在启用 的代理 H.323 呼叫过程中，向媒体代理端口发送缺少 NUL 字节的 RTCP SDES 项目，从而导致网守（gatekeeper）崩溃。

CVSS 3.7 · Low EPSS 0.36% · P30

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
willamowius gnugk < 5.16 affected
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I. Basic Information for CVE-2026-121625

Vulnerability Information
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Vulnerability Title
GNU Gatekeeper before 5.16 Out-of-Bounds Read via RTCP SDES Parsing
Source: CVE Program / CVE List V5
Vulnerability Description
GNU Gatekeeper (gnugk) before 5.16 contains an out-of-bounds read vulnerability in ParseRTCP() in ProxyChannel.cxx that allows remote RTP peers to read heap memory past received packets. Attackers can send RTCP SDES items lacking a NUL byte to the media proxy port during proxied H.323 calls with EnableRTCPStats enabled, crashing the gatekeeper.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
willamowius gnugk 0 ~ 5.16 -

II. Public POCs for CVE-2026-121625

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III. Intelligence Information for CVE-2026-121625

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Other References for CVE-2026-121625 (5)

IV. Related Vulnerabilities

Same product: gnugk
Same vendor: willamowius
Same weakness: CWE-125