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CVE-2025-53506 is an uncontrolled resource consumption vulnerability in Apache Tomcat's HTTP/2 handling. A client that does not acknowledge the initial SETTINGS frame which reduces the maximum permitted concurrent streams can cause Apache Tomcat to process excessive HTTP/2 streams. Affected releases are Tomcat 11.0.0-M1 through 11.0.8, 10.1.0-M1 through 10.1.42, and 9.0.0.M1 through 9.0.106. End-of-life Tomcat 8.5.0 through 8.5.100 is also known to be affected.
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Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A denial-of-service vulnerability affecting Apache Tomcat.
Unknown (listed as a trending CVE; associated in the list with Atlassian, but no technical details provided).
Listed as a trending/high-risk CVE affecting Apache Tomcat; no additional technical details provided in the 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.