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CVE-2021-43565 is an improper input-validation vulnerability in the golang.org/x/crypto/ssh package. The readCipherPacket() function does not safely handle an empty plaintext SSH packet. An unauthenticated client can send this malformed packet to an SSH server implemented with an affected version of the package, causing the server process to panic.
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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.
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A golang.org/x/crypto flaw where an empty plaintext packet can cause a panic.
A CVE included in the advisory's CVE reference list; the supplied advisory content provides no vulnerability description.
A denial-of-service flaw in golang.org/x/crypto in which an empty plaintext packet can cause a panic.
A denial-of-service vulnerability where an empty plaintext packet can cause a panic in golang.org/x/crypto.
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.