CVE-2023-28097: Opensips

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

OpenSIPS is a Session Initiation Protocol (SIP) server implementation. Prior to versions 3.1.9 and 3.2.6, a malformed SIP message containing a large _Content-Length_ value and a specially crafted Request-URI causes a segmentation fault in OpenSIPS. This issue occurs when a large amount of shared memory using the `-m` flag was allocated to OpenSIPS, such as 10 GB of RAM. On the test system, this issue occurred when shared memory was set to `2362` or higher. This issue is fixed in versions 3.1.9 and 3.2.6. The only workaround is to guarantee that the Content-Length value of input messages is never larger than `2147483647`.

Affected products

• Opensips Opensips: before 3.1.9 (fixed in 3.1.9); from 3.2.0, before 3.2.6 (fixed in 3.2.6)

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