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CVE-2021-29921 is an improper input-validation flaw in Python’s standard-library ipaddress module. Vulnerable versions mishandle IPv4 address strings containing octets with leading zeroes. Applications that use ipaddress to validate attacker-controlled addresses can make security decisions on a representation that is interpreted differently by another parser or downstream consumer. This discrepancy can bypass IP-address-based restrictions, including protections intended to constrain server-side requests.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An improper input-validation vulnerability in python-ipaddress when processing octal strings.
An improper-input-validation vulnerability in python-ipaddress affecting octal strings.
An improper-input-validation vulnerability in python-ipaddress when processing octal strings.
Improper validation of octal-formatted IPv4 address strings in Python's ipaddress module.
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.