Vulnerability in Red Hat Enterprise Linux 10
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.004 (32.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2025-8277 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- www.libssh.org/security/advisories/CVE-2025-8277.txt
- access.redhat.com/errata/RHSA-2026:18683 (vendor-advisory)
Frequently asked questions
- What is CVE-2025-8277?
- CVE-2025-8277 is a low-severity vulnerability in Red Hat Enterprise Linux 10, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 3.1/10. Published 2025-09-09.
- How severe is CVE-2025-8277?
- Low severity. CVSS v3 base score is 3.1 out of 10.