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CVE-2023-38703: PJSIP has use-after-free vulnerability in SRTP media transport

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-10-06 · updated 2026-06-17
• Weakness: CWE-416

Description

PJSIP is a free and open source multimedia communication library written in C with high level API in C, C++, Java, C#, and Python languages. SRTP is a higher level media transport which is stacked upon a lower level media transport such as UDP and ICE. Currently a higher level transport is not synchronized with its lower level transport that may introduce use-after-free issue. This vulnerability affects applications that have SRTP capability (`PJMEDIA_HAS_SRTP` is set) and use underlying media transport other than UDP. This vulnerability’s impact may range from unexpected application termination to control flow hijack/memory corruption. The patch is available as a commit in the master branch.

Affected products

• teluu pjsip: through 2.13.1

References

• https://github.com/pjsip/pjproject/commit/6dc9b8c181aff39845f02b4626e0812820d4ef0d
• https://github.com/pjsip/pjproject/security/advisories/GHSA-f76w-fh7c-pc66
• https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html
• https://github.com/pjsip/pjproject/commit/6dc9b8c181aff39845f02b4626e0812820d4ef0d
• https://github.com/pjsip/pjproject/security/advisories/GHSA-f76w-fh7c-pc66
• https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html

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