Description
An issue in kamailio v.6.1.1 and before allows a remote attacker to cause a denial of service via the ims_registrar_pcscf module, specifically the pcscf_save_pending/save_pending path and security-agreement parsing in sec_agree.c:parse_sec_agree()
Published: 2026-09-01
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: Denial of Service
Action: Apply Patch
AI Analysis

Impact

A vulnerability in Kamailio versions 6.1.1 and earlier allows a remote attacker to cause a denial of service by sending a malformed IMS registration or security‑agreement message that triggers a crash in the ims_registrar_pcscf module, specifically during pcscf_save_pending or when parsing the security‑agreement in sec_agree.c.

Affected Systems

The affected product is the Kamailio SIP server, versions 6.1.1 and all earlier releases; later versions are not known to contain the flaw.

Risk and Exploitability

The CVSS score of 7.5 indicates high severity. The EPSS score of <1% signals a low exploitation likelihood. The vulnerability is not listed in CISA KEV. The flaw can be exploited remotely by an attacker able to send crafted IMS traffic, but no public exploits are known, so the risk remains moderate to high for environments relying on continuous service.

Generated by OpenCVE AI on September 21, 2026 at 06:26 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Upgrade Kamailio to a version newer than 6.1.1 that resolves the parsing issue
  • If an upgrade is delayed, disable the ims_registrar_pcscf module or block incoming IMS registration traffic from untrusted sources
  • Monitor the SIP server logs for repeated failures or crashes related to pcscf registrar activity and implement redundancy or fail‑over measures

Generated by OpenCVE AI on September 21, 2026 at 06:26 UTC.

Tracking

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Advisories
Source ID Title
Debian DSA Debian DSA DSA-6494-1 kamailio security update
History

Mon, 21 Sep 2026 06:45:00 +0000

Type Values Removed Values Added
Title Denial of Service via IMS Registrar Module in Kamailio SIP Server

Tue, 15 Sep 2026 19:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-415
CPEs cpe:2.3:a:kamailio:kamailio:*:*:*:*:*:*:*:*

Thu, 10 Sep 2026 05:30:00 +0000

Type Values Removed Values Added
Title Remote Denial of Service via Security Agreement Parsing in Kamailio ims_registrar_pcscf Module
Weaknesses CWE-119

Tue, 08 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-400
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 02 Sep 2026 01:30:00 +0000

Type Values Removed Values Added
Title Remote Denial of Service via Security Agreement Parsing in Kamailio ims_registrar_pcscf Module
Weaknesses CWE-119

Wed, 02 Sep 2026 00:30:00 +0000

Type Values Removed Values Added
First Time appeared Kamailio
Kamailio kamailio
Vendors & Products Kamailio
Kamailio kamailio

Tue, 01 Sep 2026 22:00:00 +0000

Type Values Removed Values Added
Description An issue in kamailio v.6.1.1 and before allows a remote attacker to cause a denial of service via the ims_registrar_pcscf module, specifically the pcscf_save_pending/save_pending path and security-agreement parsing in sec_agree.c:parse_sec_agree()
References

Subscriptions

Kamailio Kamailio
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-09-08T19:11:35.219Z

Reserved: 2026-06-08T00:00:00.000Z

Link: CVE-2026-52023

cve-icon Vulnrichment

Updated: 2026-09-08T19:10:59.163Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-01T18:17:43.360

Modified: 2026-09-15T19:08:17.017

Link: CVE-2026-52023

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-21T06:30:09Z

Weaknesses