CVE-2023-27599

Name: CVE-2023-27599
Creator: NVD / NIST
Published: 2023-03-15T21:15:09.247+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.97%

Last modified Jun 17, 2026

CVE-2023-27599 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. OpenSIPS is a Session Initiation Protocol (SIP) server implementation. Prior to versions 3.1.7 and 3.2.4, when the function `append_hf` handles a SIP message with a malformed To header, a call to the function `abort()` is performed, resulting in a crash. EPSS estimates a 0.97% chance of exploitation in the next 30 days.

Description

OpenSIPS is a Session Initiation Protocol (SIP) server implementation. Prior to versions 3.1.7 and 3.2.4, when the function `append_hf` handles a SIP message with a malformed To header, a call to the function `abort()` is performed, resulting in a crash. This is due to the following check in `data_lump.c:399` in the function `anchor_lump`. An attacker abusing this vulnerability will crash OpenSIPS leading to Denial of Service. It affects configurations containing functions that make use of the affected code, such as the function `append_hf`. This issue has been fixed in versions 3.1.7 and 3.2.4.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.97%

57.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Opensips	Opensips	< 3.1.7
Opensips	Opensips	>= 3.2.0, < 3.2.4

References

https://github.com/OpenSIPS/opensips/commit/cb56694d290530ac308f44b453c18120b1c1109dPatch, Third Party Advisory
https://github.com/OpenSIPS/opensips/security/advisories/GHSA-qvj2-vqrg-f5jxThird Party Advisory
https://opensips.org/pub/audit-2022/opensips-audit-technical-report-full.pdfThird Party Advisory
https://github.com/OpenSIPS/opensips/commit/cb56694d290530ac308f44b453c18120b1c1109dPatch, Third Party Advisory
https://github.com/OpenSIPS/opensips/security/advisories/GHSA-qvj2-vqrg-f5jxThird Party Advisory
https://opensips.org/pub/audit-2022/opensips-audit-technical-report-full.pdfThird Party Advisory

Timeline

Published: Mar 15, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-27599?

How severe is CVE-2023-27599?

CVE-2023-27599 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.97% probability of exploitation in the next 30 days.

How do I fix CVE-2023-27599?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-27599?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST