VulnerabilityAnalyzed

CVE-2025-54804

This can result in a integer overflow.

MEDIUM 6.5EPSS 0.40%

Does this matter?

Lower severity and a low EPSS score (0.40%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 3.1: 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.40% probability · 33th percentile
CISA KEV: Not listed
Weakness: CWE-190
Affected: russh project/russh · warpgate project/warpgate
Source: security-advisories@github.com

References

https://github.com/Eugeny/russh/commit/0eb5e406780890e21ff71dd25d731b30676478e5Patch
https://github.com/Eugeny/russh/security/advisories/GHSA-h5rc-j5f5-3gcmExploit, Vendor Advisory
https://github.com/Eugeny/russh/security/advisories/GHSA-h5rc-j5f5-3gcmExploit, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.