CVE-2025-22869: SSH servers which implement file transfer protocols are vulnerable to a denial of service attack from clients

Q: How do I fix CVE-2025-22869?

ssh: upgrade to 0.35.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-22869 being exploited?

CVE-2025-22869 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-22869 affect?

CVE-2025-22869 affects ssh. Severity is high (CVSS 7.5). SSH servers which implement file transfer protocols are vulnerable to a denial of service attack from clients which complete the key exchange slowly, or not at all, causing pending content to be read into memory, but never transmitted.

Q: How urgent is CVE-2025-22869?

Priority 46/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2025-22869 is a high-severity flaw (CVSS 7.5) affecting ssh. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SSH servers which implement file transfer protocols are vulnerable to a denial of service attack from clients which complete the key exchange slowly, or not at all, causing pending content to be read into memory, but never transmitted.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 39%)
CISA exploited list	No
Weakness	CWE-770
Published	2025-02-26
Last modified	2026-06-17

Publisher (CNA): Go Project · Vendor: go

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-02-26 08:14 UTCPublished CVE record published
2026-06-17 08:50 UTCUpdated Record last modified

go ssh UPGRADE

Affected: < 0.35.0

Fixed in: 0.35.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ssh || rpm -q ssh || ssh --version

2. UPGRADE to 0.35.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ssh

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ssh

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-22869?

ssh: upgrade to 0.35.0. Exact commands for each OS are on this page.

Is CVE-2025-22869 being exploited?

CVE-2025-22869 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-22869 affect?

CVE-2025-22869 affects ssh. Severity is high (CVSS 7.5). SSH servers which implement file transfer protocols are vulnerable to a denial of service attack from clients which complete the key exchange slowly, or not at all, causing pending content to be read into memory, but never transmitted.

How urgent is CVE-2025-22869?

Priority 46/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-47913 HIGH 7.5 UPGRADE SSH clients receiving SSH_AGENT_SUCCESS when expecting a typed response will panic and cause early termination

References

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