CVE-2025-4877
libssh - security update
4.5
MEDIUM
CVSS 3.1
EPSS 0.03%
Description
There's a vulnerability in the libssh package where when a libssh consumer passes in an unexpectedly large input buffer to ssh_get_fingerprint_hash() function. In such cases the bin_to_base64() function can experience an integer overflow leading to a memory under allocation, when that happens it's possible that the program perform out of bounds write leading to a heap corruption. This issue affects only 32-bits builds of libssh.
How to fix CVE-2025-4877
To remediate CVE-2025-4877, upgrade the affected package to a fixed version below.
- —upgrade to 0.9.8-0+deb11u2 or later
- —upgrade to 0.9.8-0+deb11u2 or later
Is CVE-2025-4877 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 0.9.8-0+deb11u2
- from 0, < 0.9.8-0+deb11u2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.5 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L |