Integer Overflow Vulnerability in libssh SFTP Server
CVE-2025-5449

6.5MEDIUM

Key Information:

Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Vendor
CVE Published:
25 July 2025

What is CVE-2025-5449?

A flaw in the SFTP server message decoding logic of libssh permits an integer overflow due to an improper packet length check. This issue specifically affects 32-bit systems and can lead to failed memory allocation, ultimately crashing the server process and resulting in a denial of service. The vulnerability arises when large payload sizes are handled.

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References

https://access.redhat.com/security/cve/CVE-2025-5449
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2369705
issue-trackingx_refsource_REDHAT
https://git.libssh.org/projects/libssh.git/commit/?h=stab...

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Ronald Crane for reporting this issue.
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