CVE-2025-14821: A flaw was found in libssh

Q: How do I fix CVE-2025-14821?

libssh: upgrade to 0.12.0; hardened images: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2025-14821 being exploited?

CVE-2025-14821 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-2025-14821 affect?

CVE-2025-14821 affects libssh, hardened images. Severity is high (CVSS 7.8). A flaw was found in libssh. This vulnerability allows local man-in-the-middle attacks, security downgrades of SSH (Secure Shell) connections, and manipulation of trusted host information, posing a significant risk to the confidentiality, in

Q: How urgent is CVE-2025-14821?

Priority 33/100. High severity; On your watchlist

Routine

HIGH 7.8WATCHLISTUPGRADEMITIGATE

CVE-2025-14821 is a high-severity flaw (CVSS 7.8) affecting libssh, hardened images. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found in libssh. This vulnerability allows local man-in-the-middle attacks, security downgrades of SSH (Secure Shell) connections, and manipulation of trusted host information, posing a significant risk to the confidentiality, integrity, and availability of SSH communications via an insecure default configuration on Windows systems where the library automatically loads configuration files from the C:\etc directory, which can be created

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 97%)
CISA exploited list	No
Weakness	CWE-427
Published	2026-04-07
Last modified	2026-10-14

Publisher (CNA): Red Hat, Inc. · Vendor: libssh · redhat

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-07 17:16 UTCPublished CVE record published
2026-10-14 17:10 UTCUpdated Record last modified

libssh libssh UPGRADE

Affected: < 0.12.0

Fixed in: 0.12.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.12.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade libssh

Note

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

redhat hardened images MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy hardened-images || rpm -q hardened-images || hardened-images --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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-2025-14821?

libssh: upgrade to 0.12.0; hardened images: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-14821 being exploited?

CVE-2025-14821 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-2025-14821 affect?

CVE-2025-14821 affects libssh, hardened images. Severity is high (CVSS 7.8). A flaw was found in libssh. This vulnerability allows local man-in-the-middle attacks, security downgrades of SSH (Secure Shell) connections, and manipulation of trusted host information, posing a significant risk to the confidentiality, in

How urgent is CVE-2025-14821?

Priority 33/100. High severity; On your watchlist

Software pages

Windows vulnerabilities

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References

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