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.
Published: 2025-08-20
Score: 4.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-4385-1 libssh security update
EUVD EUVD EUVD-2025-28257 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.
Ubuntu USN Ubuntu USN USN-7619-1 libssh vulnerabilities
Ubuntu USN Ubuntu USN USN-7696-1 libssh vulnerabilities
History

Wed, 20 Aug 2025 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 20 Aug 2025 12:30:00 +0000

Type Values Removed Values Added
Description No description is available for this CVE. 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.
Title libssh: Write beyond bounds in binary to base64 conversion functions Libssh: write beyond bounds in binary to base64 conversion functions
First Time appeared Redhat
Redhat enterprise Linux
Redhat openshift
CPEs cpe:/a:redhat:openshift:4
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat openshift
References

Fri, 04 Jul 2025 00:30:00 +0000

Type Values Removed Values Added
Description No description is available for this CVE.
Title libssh: Write beyond bounds in binary to base64 conversion functions
Weaknesses CWE-190
CWE-787
References
Metrics threat_severity

None

 cvssV3_1

{'score': 4.5, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L'}

threat_severity

Moderate

Subscriptions

Redhat Enterprise Linux Openshift
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-02-25T20:31:09.066Z

Reserved: 2025-05-16T22:23:41.045Z

Link: CVE-2025-4877

cve-icon Vulnrichment

Updated: 2025-08-20T15:14:34.584Z

cve-icon NVD

Status : Deferred

Published: 2025-08-20T13:15:28.890

Modified: 2026-04-15T00:35:42.020

Link: CVE-2025-4877

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-06-24T00:00:00Z

Links: CVE-2025-4877 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses