CVE-2025-8277
LOWRed Hat Enterprise Linux 6-10 and OpenShift Container Platform 4 - Denial of Service via libssh KEX Memory Leak
Title source: llmDescription
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.
References (4)
Core 4
Core References
Vendor Advisory vdb-entry
x_refsource_redhat
https://access.redhat.com/security/cve/CVE-2025-8277
Issue Tracking issue-tracking
x_refsource_redhat
https://bugzilla.redhat.com/show_bug.cgi?id=2383888
Vendor Advisory vendor-advisory
x_refsource_redhat
RHSA-2026:18683
https://access.redhat.com/errata/RHSA-2026:18683
Scores
CVSS v3
3.1
EPSS
0.0037
EPSS Percentile
29.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-401
Status
published
Products (7)
Red Hat/Red Hat Enterprise Linux 10
Red Hat/Red Hat Enterprise Linux 6
Red Hat/Red Hat Enterprise Linux 7
Red Hat/Red Hat Enterprise Linux 8
Red Hat/Red Hat Enterprise Linux 9
Red Hat/Red Hat Enterprise Linux 9
0:0.10.4-18.el9
Red Hat/Red Hat OpenShift Container Platform 4
Published
Sep 09, 2025
Tracked Since
Feb 18, 2026