CVE-2025-4877 – Libssh Out-of-Bounds Write Vulnerability

CVE ID : CVE-2025-4877

Published : Aug. 20, 2025, 1:15 p.m. | 1 hour ago

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.

Severity: 4.5 | MEDIUM

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