EUVD-2026-20617Severity by source
AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
4DescriptionGitHub Advisory
Kamailio is an open source implementation of a SIP Signaling Server. Prior to 6.0.5 and 5.8.7, an out-of-bounds read in the auth module of Kamailio (formerly OpenSER and SER) allows remote attackers to cause a denial of service (process crash) via a specially crafted SIP packet if a successful user authentication without a database backend is followed by additional user identity checks. This vulnerability is fixed in 6.0.5 and 5.8.7.
AnalysisAI
Kamailio versions prior to 6.0.5 and 5.8.7 contain an out-of-bounds read in the auth module that allows remote attackers with high privileges to trigger a denial of service via a specially crafted SIP packet when successful user authentication without a database backend is followed by additional identity checks. The vulnerability requires high privilege level and high attack complexity but can reliably crash the Kamailio process, impacting SIP service availability.
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Vulnerability AssessmentAI
| Risk Assessment | The CVSS 3.1 score of 4.4 reflects moderate severity with critical constraints: the attack vector is network-based but requires high privilege level (PR:H), high attack complexity (AC:H), and no user interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with authenticated high-privilege access to a Kamailio SIP environment (such as a compromised administrative account or trusted service account) crafts a specially-formed SIP packet that first successfully authenticates using the non-database-backend authentication method and then triggers an additional user identity check. The malformed packet causes an out-of-bounds read in the auth module's buffer, resulting in an immediate process crash and interruption of SIP signaling services. … |
| Remediation | Vendor-released patch: Upgrade to Kamailio 6.0.5 or 5.8.7 depending on your installed version. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
Share
External POC / Exploit Code
Leaving vuln.today