Vulnerability record/PUBLISHED/Published Sep 9, 2025 11:55:39 UTC
CVE-2025-8277
A flaw was found in libssh's handling of key exchange (KEX) processes when a client repeatedly sends incorrect KEX guesses. The library fails to free memory during these rekey operations, which can gradually exhaust system memory. This issue can lead to crashes on the client side, particularly when using libgcrypt, which impacts application stability and availability.
Base score3.1/ 10
SeverityLowCVSS 3.1
Exploitability / impact
CVSS metric breakdown
Base severityLow
Attack vectorNetworkAV
Attack complexityHighAC
Privileges requiredLowPR
User interactionNoneUI
ScopeUnchangedS
Confidentiality impactNoneC
Integrity impactNoneI
Availability impactLowA
CVSS vector string
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:LCVSS communicates standardized severity and impact characteristics. It does not establish whether a system is exploitable in your specific environment.
Record context
CVE Numbering Authorityredhat
Last updatedNov 6, 2026 17:46:44 UTC
PublishedSep 9, 2025 11:55:39 UTC
ReservedJul 28, 2025 11:02:27 UTC
Credits
- Red Hat would like to thank Francesco Rollo for reporting this issue.