CVE-2023-27596: Opensips

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

OpenSIPS is a Session Initiation Protocol (SIP) server implementation. Prior to versions 3.1.8 and 3.2.5, OpenSIPS crashes when a malformed SDP body is sent multiple times to an OpenSIPS configuration that makes use of the `stream_process` function. This issue was discovered during coverage guided fuzzing of the function `codec_delete_except_re`. By abusing this vulnerability, an attacker is able to crash the server. It affects configurations containing functions that rely on the affected code, such as the function `codec_delete_except_re`. This issue has been fixed in version 3.1.8 and 3.2.5.

Affected products

• Opensips Opensips: before 3.1.8 (fixed in 3.1.8); from 3.2.0, before 3.2.5 (fixed in 3.2.5)

Published 2023-03-15. Last modified 2026-06-17.