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CVE-2023-28097: OpenSIPS has vulnerability in the Content-Length Parser

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-03-15 · updated 2026-06-17
• Weakness: CWE-190

Description

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: before 3.1.9; from 3.2.0 before 3.2.6 — fixed in 3.1.9, 3.2.6

How to fix

Upgrade to a fixed version: opensips 3.1.9, 3.2.6. Check the vendor advisory for mitigations.

References

• https://github.com/OpenSIPS/opensips/commit/7cab422e2fc648f910abba34f3f0dbb3ae171ff5
• https://github.com/OpenSIPS/opensips/security/advisories/GHSA-c6j5-f4h4-2xrq
• https://opensips.org/pub/audit-2022/opensips-audit-technical-report-full.pdf
• https://github.com/OpenSIPS/opensips/commit/7cab422e2fc648f910abba34f3f0dbb3ae171ff5
• https://github.com/OpenSIPS/opensips/security/advisories/GHSA-c6j5-f4h4-2xrq
• https://opensips.org/pub/audit-2022/opensips-audit-technical-report-full.pdf

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