CVE-2025-53506
CVE-2025-53506 · Apache Tomcat: DoS via excessive h2 streams at connection start
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 7.5 · High · EPSS 2.1% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
apache tomcat
- Versions
- ≥ 11.0.0-M1, ≤ 11.0.8: Affected (semver)
- ≥ 10.1.0-M1, ≤ 10.1.42: Affected (semver)
- ≥ 9.0.0.M1, ≤ 9.0.106: Affected (semver)
- ≥ 8.5.0, ≤ 8.5.100: Affected (semver)
- ≥ 10.0.0-M1, ≤ 10.0.27: Unknown (semver)
No fix published
tomcat10 Debian:12
- Versions
- 10.1.10-1
- 10.1.13-1
- 10.1.14-1
- 10.1.15-1
- 10.1.16-1
- 10.1.20-1
- 10.1.23-1
- 10.1.25-1
- 10.1.25-1~bpo12+1
- 10.1.25-2
- 10.1.30-1
- 10.1.30-1~bpo12+1
- 10.1.31-1
- 10.1.33-1
- 10.1.33-1~bpo12+1
- 10.1.34-0+deb12u1
- 10.1.34-0+deb12u2
- 10.1.34-1
- 10.1.35-1
- 10.1.40-1
- 10.1.40-1~bpo12+1
- 10.1.46-1
- 10.1.6-1
- 10.1.6-1+deb12u1
- 10.1.6-1+deb12u2
- 10.1.7-1
- 10.1.8-1
- 10.1.9-1
- Affected ranges
- ECOSYSTEM: < 10.1.52-1~deb12u1
Update to 10.1.52-1~deb12u1
tomcat10 Debian:13
- Versions
- 10.1.40-1
- 10.1.46-1
- 10.1.52-1~deb12u1
- Affected ranges
- ECOSYSTEM: < 10.1.52-1~deb13u1
Update to 10.1.52-1~deb13u1
tomcat10 Debian:14
- Versions
- 10.1.40-1
- Affected ranges
- ECOSYSTEM: < 10.1.46-1
Update to 10.1.46-1
tomcat11 Debian:13
- Versions
- 11.0.11-1
- 11.0.6-1
- Affected ranges
- ECOSYSTEM: < 11.0.15-1~deb13u1
Update to 11.0.15-1~deb13u1
tomcat11 Debian:14
- Versions
- 11.0.6-1
- Affected ranges
- ECOSYSTEM: < 11.0.11-1
Update to 11.0.11-1
tomcat9 Debian:12
- Affected ranges
- ECOSYSTEM: < 9.0.70-2
Update to 9.0.70-2
tomcat9 Debian:13
- Affected ranges
- ECOSYSTEM: < 9.0.70-2
Update to 9.0.70-2
tomcat9 Debian:14
- Affected ranges
- ECOSYSTEM: < 9.0.70-2
Update to 9.0.70-2
tomcat8 Ubuntu:Pro:18.04:LTS
- Versions
- 8.5.21-1ubuntu1
- 8.5.29-1
- 8.5.30-1
- 8.5.30-1ubuntu1
- 8.5.30-1ubuntu1.2
- 8.5.30-1ubuntu1.3
- 8.5.30-1ubuntu1.4
- 8.5.39-1ubuntu1~18.04.1
- 8.5.39-1ubuntu1~18.04.2
- 8.5.39-1ubuntu1~18.04.3
- 8.5.39-1ubuntu1~18.04.3+esm1
- 8.5.39-1ubuntu1~18.04.3+esm2
- 8.5.39-1ubuntu1~18.04.3+esm3
- 8.5.39-1ubuntu1~18.04.3+esm4
- 8.5.39-1ubuntu1~18.04.3+esm5
- 8.5.39-1ubuntu1~18.04.3+esm6
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat9 Ubuntu:Pro:18.04:LTS
- Versions
- 9.0.16-3~18.04.1
- 9.0.16-3ubuntu0.18.04.1
- 9.0.16-3ubuntu0.18.04.2
- 9.0.16-3ubuntu0.18.04.2+esm1
- 9.0.16-3ubuntu0.18.04.2+esm2
- 9.0.16-3ubuntu0.18.04.2+esm3
- 9.0.16-3ubuntu0.18.04.2+esm4
- 9.0.16-3ubuntu0.18.04.2+esm5
- 9.0.16-3ubuntu0.18.04.2+esm6
- 9.0.16-3ubuntu0.18.04.2+esm7
- 9.0.16-3ubuntu0.18.04.2+esm8
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat9 Ubuntu:Pro:20.04:LTS
- Versions
- 9.0.24-1
- 9.0.27-1
- 9.0.31-1
- 9.0.31-1ubuntu0.1
- 9.0.31-1ubuntu0.2
- 9.0.31-1ubuntu0.3
- 9.0.31-1ubuntu0.4
- 9.0.31-1ubuntu0.5
- 9.0.31-1ubuntu0.6
- 9.0.31-1ubuntu0.7
- 9.0.31-1ubuntu0.8
- 9.0.31-1ubuntu0.9
- 9.0.31-1ubuntu0.9+esm1
- 9.0.31-1ubuntu0.9+esm2
- 9.0.31-1ubuntu0.9+esm3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat9 Ubuntu:Pro:22.04:LTS
- Versions
- 9.0.43-3
- 9.0.54-1
- 9.0.55-1
- 9.0.58-1
- 9.0.58-1ubuntu0.1
- 9.0.58-1ubuntu0.1+esm1
- 9.0.58-1ubuntu0.1+esm2
- 9.0.58-1ubuntu0.1+esm3
- 9.0.58-1ubuntu0.1+esm4
- 9.0.58-1ubuntu0.2
- 9.0.58-1ubuntu0.2+esm1
- 9.0.58-1ubuntu0.2+esm2
- 9.0.58-1ubuntu0.2+esm3
- 9.0.58-1ubuntu0.2+esm4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat10 Ubuntu:24.04:LTS
- Versions
- 10.1.10-1
- 10.1.14-1
- 10.1.15-1
- 10.1.16-1
- 10.1.16-1ubuntu0.1~esm1
- 10.1.16-1ubuntu0.1~esm2
- 10.1.16-1ubuntu0.1~esm3
- 10.1.16-1ubuntu0.1~esm4
- 10.1.55-1ubuntu2~24.04.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat10 Ubuntu:25.10
- Versions
- 10.1.35-1
- 10.1.40-1
- 10.1.40-1ubuntu1
- 10.1.40-1ubuntu1.25.10.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat11 Ubuntu:25.10
- Versions
- 11.0.6-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat10 Ubuntu:26.10
- Versions
- 10.1.40-1ubuntu1
- 10.1.54-1
- 10.1.54-1ubuntu1
- 10.1.54-1ubuntu2
- 10.1.55-1ubuntu1
- 10.1.55-1ubuntu2
- 10.1.57~us1-0ubuntu1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat10 Ubuntu:26.04:LTS
- Versions
- 10.1.40-1ubuntu1
- 10.1.40-1ubuntu1.26.04.1
- 10.1.55-1ubuntu2~26.04.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
tomcat11 Ubuntu:26.04:LTS
- Versions
- 11.0.6-1
- 11.0.11-1
- 11.0.15-1
- 11.0.18-1
- 11.0.18-1ubuntu0.1~esm1
- 11.0.22-2ubuntu2~26.04.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published