How severe is CVE-2025-54804?

CVE-2025-54804 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-54804 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-54804?

CVE-2025-54804 primarily affects Russh Project Russh. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-54804?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-54804 have an EU (EUVD) identifier?

Yes. CVE-2025-54804 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-23576.

When was CVE-2025-54804 published?

CVE-2025-54804 was published on 2025-08-05 and last updated on 2026-06-17.

CVE-2025-54804

CVE-2025-54804 is a medium-severity vulnerability in Russh Project Russh with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-190.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-23576
Weakness: CWE-190
Affected product: Russh Project Russh
Published: 2025-08-05
Last modified: 2026-06-17

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.

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.
How severe is CVE-2025-54804?: CVE-2025-54804 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-54804 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-54804?: CVE-2025-54804 primarily affects Russh Project Russh. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-54804?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-54804 have an EU (EUVD) identifier?: Yes. CVE-2025-54804 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-23576.
When was CVE-2025-54804 published?: CVE-2025-54804 was published on 2025-08-05 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:russh_project:russh:*:*:*:*:*:rust:*:*
cpe:2.3:a:warpgate_project:warpgate:*:*:*:*:*:*:*:*

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