Integer overflow in Eugeny Russh
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.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (36.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Eugeny Russh — versions < 0.54.1
- Russh Project
- Warpgate Project
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/Eugeny/russh/security/advisories/GHSA-h5rc-j5f5-3gcm (Exploit, Vendor Advisory)
- github.com/Eugeny/russh/commit/0eb5e406780890e21ff71dd25d731b30676478e5 (Patch)
Frequently asked questions
- What is CVE-2025-54804?
- CVE-2025-54804 is a medium-severity vulnerability in Eugeny Russh, classified under Integer Overflow or Wraparound. CVSS score: 6.5/10. Published 2025-08-05.
- How severe is CVE-2025-54804?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2025-54804 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.