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CVE-2025-48989: Apache Tomcat: h2 DoS - Made You Reset

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-13 · updated 2026-06-17
• Weakness: CWE-404

Description

Improper Resource Shutdown or Release vulnerability in Apache Tomcat made Tomcat vulnerable to the made you reset attack. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.9, from 10.1.0-M1 through 10.1.43 and from 9.0.0.M1 through 9.0.107. Older, EOL versions may also be affected. Users are recommended to upgrade to one of versions 11.0.10, 10.1.44 or 9.0.108 which fix the issue.

Affected products

• Apache Tomcat: from 9.0.1 before 9.0.108; from 10.0.0 before 10.1.44; from 11.0.0 before 11.0.10; 9.0.0-milestone1, 9.0.0-milestone10, 9.0.0-milestone11, 9.0.0-milestone12, 9.0.0-milestone13, 9.0.0-milestone14 (+21) — fixed in 10.1.44, 11.0.10, 9.0.108

How to fix

Upgrade to a fixed version: Apache Tomcat 10.1.44, 11.0.10, 9.0.108. Check the vendor advisory for mitigations.

References

• https://lists.apache.org/thread/9ydfg0xr0tchmglcprhxgwhj0hfwxlyf
• http://www.openwall.com/lists/oss-security/2025/08/13/2
• https://www.kb.cert.org/vuls/id/767506
• https://cert-portal.siemens.com/productcert/html/ssa-032379.html

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