CVE-2026-129116
C-Kermit 7.0.197 before 11.1.515 IKSD Authentication Bypass via Refused Certificate Login
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
C-Kermit from 7.0.197 before 11.1.515 contains an authentication bypass vulnerability in the IKSD SSL build that leaves Telnet authentication state at AUTH_VALID after a refused certificate login. Attackers holding a trusted certificate mapped to a refused account can log in as any other account with any password, gaining that account's shell access.
| CWE | CWE-287 |
| Vendor | openkermit |
| Product | c-kermit |
| Published | Nov 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
OpenKermit / C-Kermit
7.0.197 < 11.1.515
References
github.com: https://github.com/OpenKermit/ckermit/security/advisories/GHSA-5pc4-gh6q-5h4w github.com: https://github.com/OpenKermit/ckermit/commit/fdfe8f13159f9276d87e02bedba15946b0edda97 github.com: https://github.com/OpenKermit/ckermit/releases/tag/v11.1.515 github.com: https://github.com/OpenKermit/ckermit/blob/v11.0.514/ckufio.c#L8249 vulncheck.com: https://www.vulncheck.com/advisories/c-kermit-7.0.197-before-11.1.515-iksd-authentication-bypass-via-refused-certificate-login
Credits
John Goerzen John Goerzen