CVE-2025-54804: russh Integer Overflow

Description

Russh is a Rust SSH client & server library. In versions 0.54.0 and below, the channel window adjust message of the SSH protocol is used to track the free space in the receive buffer of the other side of a channel. The current implementation takes the value from the message and adds it to an internal state value. This can result in a integer overflow. If the Rust code is compiled with overflow checks, it will panic. A malicious client can crash a server. This is fixed in version 0.54.1.

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CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-190 Integer Overflow

Affected Products

Vendor	Product	Versions
russh_project	russh	< 0.54.1
warpgate_project	warpgate	< 0.16.0

References

Advisories & Patches

https://github.com/Eugeny/russh/commit/0eb5e406780890e21ff71dd25d731b30676478e5 https://github.com/Eugeny/russh/security/advisories/GHSA-h5rc-j5f5-3gcm https://github.com/Eugeny/russh/security/advisories/GHSA-h5rc-j5f5-3gcm

Exploits

https://github.com/Eugeny/russh/security/advisories/GHSA-h5rc-j5f5-3gcm https://github.com/Eugeny/russh/security/advisories/GHSA-h5rc-j5f5-3gcm

Frequently Asked Questions

What is CVE-2025-54804? +

Russh is a Rust SSH client & server library. In versions 0.54.0 and below, the channel window adjust message of the SSH protocol is used to track the free space in the receive buffer of the other side of a channel. The current implementation takes the value from the message and adds it to an internal state value. This can result in a integer overflow. If the Rust code is compiled with overflow checks, it will panic. A malicious client can crash a server. This is fixed in version 0.54.1. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2025-54804? +

CVE-2025-54804 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-54804? +

CVE-2025-54804 affects products from russh_project, warpgate_project, specifically: russh, warpgate. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-54804? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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