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CVE-2025-53506 Apache Tomcat

Affected softwareApache Tomcat
Severity7.5 High CVSS 3.1
Fixed in11.0.9, 10.1.43, 9.0.107
WeaknessUncontrolled resource consumption (CWE-400)
Published10 Jul 2025
Updated17 Jun 2026

Description

Uncontrolled Resource Consumption vulnerability in Apache Tomcat if an HTTP/2 client did not acknowledge the initial settings frame that reduces the maximum permitted concurrent streams. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.8, from 10.1.0-M1 through 10.1.42, from 9.0.0.M1 through 9.0.106. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 through 8.5.100. Other EOL versions may also be affected. Users are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. Published a year ago.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 2.1% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists: apache/tomcat 2aa6261.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update October 2025 ↗ CPU 2025-Q4 Oracle Graph Server and Client / Install (Apache Tomcat) (24.4.3, 25.3.0)
Oracle Retail Applications / Xenvironment (Apache Tomcat) (24.0.1)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Graph Server and Client Install (Apache Tomcat) 24.4.3, 25.3.0 24.4.3 · 25.3.0
Oracle Retail Applications Xenvironment (Apache Tomcat) 24.0.1 24.0.1

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.apache.tomcat:tomcat-coyote 11.0.0-M1 11.0.9 unbounded
org.apache.tomcat:tomcat-coyote 10.1.0-M1 10.1.43 unbounded
org.apache.tomcat:tomcat-coyote 9.0.0.M1 9.0.107 unbounded
org.apache.tomcat:tomcat-coyote 8.5.0 none 8.5.100
org.apache.tomcat.embed:tomcat-embed-core 8.5.0 none 8.5.100
org.apache.tomcat.embed:tomcat-embed-core 9.0.0.M1 9.0.107 unbounded
org.apache.tomcat.embed:tomcat-embed-core 10.1.0-M1 10.1.43 unbounded
org.apache.tomcat.embed:tomcat-embed-core 11.0.0-M1 11.0.9 unbounded

Products and versions

3 products, 11 version entries
SourceVendorProductSchemeAffected versions
nvd apache tomcat generic ≥ 9.0.0 and ≤ 9.0.106 · ≥ 10.1.0 and ≤ 10.1.42 · ≥ 11.0.0 and ≤ 11.0.8
osv org.apache.tomcat tomcat-coyote generic ≥ 8.5.0 and ≤ 8.5.100 · ≥ 9.0.0 and < 9.0.107 · ≥ 10.1.0 and < 10.1.43 · ≥ 11.0.0 and < 11.0.9
osv org.apache.tomcat.embed tomcat-embed-core generic ≥ 8.5.0 and ≤ 8.5.100 · ≥ 9.0.0 and < 9.0.107 · ≥ 10.1.0 and < 10.1.43 · ≥ 11.0.0 and < 11.0.9

References

URLTags
https://github.com/apache/tomcat/commit/2aa6261276ebe50b99276953591e3a2be7898bdb WEB
https://github.com/apache/tomcat/commit/434772930f362145516dd60681134e7f0cf8115b WEB
https://github.com/apache/tomcat/commit/be8f330f83ceddaf3baeed57522e571572b6b99b WEB
https://github.com/apache/tomcat PACKAGE
https://lists.apache.org/thread/p09775q0rd185m6zz98krg0fp45j8kr0 WEB
https://lists.debian.org/debian-lts-announce/2025/07/msg00009.html WEB
http://www.openwall.com/lists/oss-security/2025/07/10/13 WEB

Timeline

Published2025-07-10By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.