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CVE-2021-30641 is an improper input-validation flaw in Apache HTTP Server versions 2.4.39 through 2.4.46. A regression introduced during an earlier security fix caused unexpected URL and <Location> section matching when the MergeSlashes directive is configured as OFF. Requests containing consecutive slash characters can consequently be matched against configuration sections differently than intended.
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No public exploit code observed for this vulnerability.
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An Apache HTTP Server URL-matching flaw that causes unexpected matching when MergeSlashes is set to OFF.
An Apache HTTP Server URL-matching flaw that causes unexpected matching when MergeSlashes is set to OFF.
An Apache HTTP Server URL-matching vulnerability that occurs when the MergeSlashes directive is disabled; it is addressed by the Red Hat httpd update.
An unexpected URL matching behavior flaw in Apache HTTP Server when the MergeSlashes directive is disabled, affecting versions 2.4.39 through 2.4.46.
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.