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CVE-2022-27191 is a denial-of-service vulnerability in the Go golang.org/x/crypto/ssh package before version 0.0.0-20220314234659-1baeb1ce4c0b. A crash can occur in an SSH server when a signer passed to ServerConfig.AddHostKey does not implement AlgorithmSigner but reports an ssh-rsa public key. The flaw can also manifest during RSA-key authentication against servers that reject SHA-2-based signature algorithms.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
24 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Go golang.org/x/crypto/ssh flaw that can crash an SSH server.
Crash vulnerability in a golang.org/x/crypto/ssh server.
The advisory identifies this CVE as addressed but does not provide vulnerability details in the supplied content.
A crash vulnerability in the golang.org/x/crypto/ssh server implementation.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.