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Vulnerabilities CVE-2025-4877

CVE-2025-4877

Medium
Open
TLP:CLEAR

Libssh: write beyond bounds in binary to base64 conversion functions

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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.

Details

CVSS Score
4.5
CVSS Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Confidence
90%
Published
Aug 20, 2025
Last Modified
Aug 21, 2026
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