CVE-2026-84975 PJSIP - Authentication Bypass

PJSIP <= 2.17 contains a server impersonation vulnerability caused by improper handling of DNS SubjectAltName with embedded NUL bytes in OpenSSL and GnuTLS backends, letting attackers with a trusted certificate and interception capability impersonate servers, exploit requires attacker to intercept connection and possess a trusted certificate.

CVSS base score 7.4 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.23% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
18 September 2026
Updated
15 October 2026
Weakness
CWE-295

Vendor fix

Update to a version that properly handles DNS SubjectAltName or apply patches when available.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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