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CVE-2021-33195 is an improper input-validation vulnerability in Go's net package DNS lookup functionality. In affected Go releases before 1.15.13 and 1.16.x before 1.16.5, lookup functions do not validate DNS server replies against RFC 1035 hostname formatting requirements. LookupCNAME, LookupSRV, LookupMX, LookupNS, LookupAddr, and corresponding Resolver methods can consequently return arbitrary DNS-derived values, including invalid host names. Applications that use these values without appropriate validation or output encoding may be exposed to injection of unexpected content, including cross-site scripting.
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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.
28 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Go net package flaw in which lookup functions may return invalid host names. It affects installed Golang-related packages on Rocky Linux 8 covered by CIQ advisory crlsa-2021_4156.
A Go net package vulnerability in which lookup functions may return invalid host names.
A Go net flaw where lookup functions may return invalid host names.
A Go net package flaw where lookup functions may return invalid host names.
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.