vulnerability
Ubuntu: (Multiple Advisories) (CVE-2025-4877): libssh vulnerabilities
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 4 | (AV:L/AC:M/Au:S/C:P/I:P/A:P) | Jun 25, 2025 | Jul 8, 2025 | Apr 16, 2026 |
Severity
4
CVSS
(AV:L/AC:M/Au:S/C:P/I:P/A:P)
Published
Jun 25, 2025
Added
Jul 8, 2025
Modified
Apr 16, 2026
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.
Solutions
ubuntu-pro-upgrade-libssh-4ubuntu-upgrade-libssh-4
References
- CVE-2025-4877
- https://attackerkb.com/topics/CVE-2025-4877
- CWE-787
- EUVD-EUVD-2025-28257
- UBUNTU-USN-7619-1
- UBUNTU-USN-7696-1
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-28257
- https://ubuntu.com/security/notices/USN-7619-1
- https://www.cve.org/CVERecord?id=CVE-2025-4877
- https://www.libssh.org/security/advisories/CVE-2025-4877.txt
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