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CVE-2020-13934 is an uncontrolled resource-consumption vulnerability in Apache Tomcat's handling of direct cleartext HTTP/2 (h2c) connections. Following an HTTP/1.1-to-HTTP/2 upgrade, affected Tomcat versions fail to release the HTTP/1.1 processor. Repeated h2c upgrade requests retain processors and consume heap memory until the JVM throws an OutOfMemoryException, resulting in denial of service. Affected releases are Tomcat 8.5.1 through 8.5.56, 9.0.0.M5 through 9.0.36, and 10.0.0-M1 through 10.0.0-M6.
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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.
If you can’t patch tonight, do this now.
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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An Apache Tomcat HTTP/2 connection-leak flaw causing out-of-memory denial of service.
A denial-of-service vulnerability in Tomcat where an HTTP/2 connection leak can cause an OutOfMemoryException.
A denial-of-service vulnerability in Apache Tomcat in which an HTTP/2 connection leak can cause an OutOfMemoryException.
A denial-of-service vulnerability in Apache Tomcat in which an HTTP/2 connection leak can cause an OutOfMemoryException.
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.