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CVE-2021-22991 is a buffer overflow vulnerability in F5 BIG-IP caused by incorrect handling of certain requests during URI normalization by the Traffic Management Microkernel (TMM). Affected versions include BIG-IP 16.0.x before 16.0.1.1, 15.1.x before 15.1.2.1, 14.1.x before 14.1.4, 13.1.x before 13.1.3.6, and 12.1.x before 12.1.5.3. When specially crafted requests are sent to a vulnerable virtual server, TMM may process the normalized URI incorrectly and trigger a memory corruption condition leading to a buffer overflow. The primary documented outcome is denial of service. In certain situations, the flaw may theoretically permit bypass of URL-based access controls or remote code execution.
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No public exploit code observed for this vulnerability.
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7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A buffer overflow vulnerability in F5 BIG-IP that the MANGA Mirai variant attempts to exploit.
Kriittinen puskuriylivuoto TMM-komponentissa, joka voi johtaa palvelunestoon (DoS).
A buffer overflow caused by incorrect URI normalization in an application traffic product; notable because the content explicitly says it was exploited in the wild.
Incorrect URI normalization in an application traffic product causes a buffer overflow. The content identifies known exploitation through CISA KEV.
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.