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CVE-2021-39275 is an out-of-bounds write vulnerability in Apache HTTP Server's ap_escape_quotes() function. When the function processes malicious input, it may write beyond the end of its destination buffer. Apache HTTP Server 2.4.48 and earlier are affected. Apache-bundled modules do not pass untrusted data to the affected function; exposure depends on a third-party or external module doing so.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An Apache HTTP Server (httpd) out-of-bounds write vulnerability in ap_escape_quotes() that can be triggered through malicious input, affecting installed packages on Rocky Linux 8.
An out-of-bounds write vulnerability in Apache HTTP Server, rated low severity by Apache because no bundled module passes untrusted data to the affected function, though third-party modules might.
An Apache HTTP Server out-of-bounds write in ap_escape_quotes() reachable through malicious input.
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.