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CVE-2021-3733 is a client-side regular-expression denial-of-service vulnerability in Python urllib HTTP Basic Authentication handling. AbstractBasicAuthHandler uses a regular expression whose processing can become quadratic when parsing specially crafted invalid authentication data. The vulnerable authentication-request handling is reachable through AbstractBasicAuthHandler and derived handlers, including HTTPBasicAuthHandler and ProxyBasicAuthHandler.
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No public exploit code observed for this vulnerability.
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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.
Unknown; the advisory identifies it as addressed but provides no vulnerability description.
Unknown; the advisory lists this CVE as addressed by the OpenShift Virtualization 2.6.8 update but provides no vulnerability description.
A regular-expression denial-of-service vulnerability in Python urllib's AbstractBasicAuthHandler.
A vulnerability referenced by the advisory without a description in the provided content.
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.