Integer Overflow Vulnerability in Russh SSH Client and Server Library
CVE-2025-54804

6.5MEDIUM

Key Information:

Vendor

Eugeny

Status
Russh
Vendor
CVE Published:
5 August 2025

What is CVE-2025-54804?

The Russh library, which serves as a Rust SSH client and server, is vulnerable to an integer overflow issue in versions 0.54.0 and earlier. This vulnerability arises when the channel window adjust message is processed incorrectly, leading to a potential overflow in the internal state value that tracks free buffer space. Affected systems may experience a crash when a malicious client sends crafted messages, particularly if the Rust code is compiled without overflow checks. This issue has been addressed in version 0.54.1, which users are advised to upgrade to in order to mitigate the risk.

Affected Version(s)

russh < 0.54.1

References

https://github.com/Eugeny/russh/security/advisories/GHSA-...
x_refsource_CONFIRM
https://github.com/Eugeny/russh/commit/0eb5e406780890e21f...
x_refsource_MISC

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

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CVE-2025-54804 : Integer Overflow Vulnerability in Russh SSH Client and Server Library