CVE-2022-29245: SSH.NET is a Secure Shell (SSH) library for .NET

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MEDIUM 6.5DOWNGRADE

CVE-2022-29245 is a medium-severity flaw (CVSS 6.5) affecting ssh.net. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SSH.NET is a Secure Shell (SSH) library for .NET. In versions 2020.0.0 and 2020.0.1, during an `X25519` key exchange, the client’s private key is generated with `System.Random`. `System.Random` is not a cryptographically secure random number generator, it must therefore not be used for cryptographic purposes. When establishing an SSH connection to a remote host, during the X25519 key exchange, the private key is generated with a weak random numbe

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-338
Published	2022-05-31
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: ssh.net project

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

Am I affected?

Timeline

2022-05-31 17:15 UTCPublished CVE record published
2026-06-17 04:39 UTCUpdated Record last modified

ssh.net project ssh.net DOWNGRADE

Affected: 2020.0.0 · 2020.0.0 beta1 · 2020.0.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2020.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2020.0.0 (Debian / Ubuntu)

apt-cache madison ssh.net sudo apt install ssh.net=<VERSION_BEFORE_2020.0.0> sudo apt-mark hold ssh.net

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ssh.net sudo dnf downgrade ssh.net-<VERSION_BEFORE_2020.0.0> sudo dnf versionlock add ssh.net

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2022-29245?

ssh.net: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-29245 being exploited?

CVE-2022-29245 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-2022-29245 affect?

CVE-2022-29245 affects ssh.net. Severity is medium (CVSS 6.5). SSH.NET is a Secure Shell (SSH) library for .NET. In versions 2020.0.0 and 2020.0.1, during an `X25519` key exchange, the client’s private key is generated with `System.Random`. `System.Random` is not a cryptographically secure random numbe

How urgent is CVE-2022-29245?

Priority 46/100. Public exploit reference

References

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