CVE-2025-53506

HIGH EPSS 77.1%
Published Jul 10, 202511mo ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
High
Find Similar
Published Jul 10, 2025 11mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
77.1% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-400 Uncontrolled Resource Consumption Resource Mgmt

Affected Products 3

VendorProductVersionRange
apachetomcat*≥9.0.0  –  ≤9.0.106
apachetomcat*≥10.1.0  –  ≤10.1.42
apachetomcat*≥11.0.0  –  ≤11.0.8

References 3

  • openwall.com http://www.openwall.com/lists/oss-security/2025/07/10/13
  • lists.apache.org https://lists.apache.org/thread/p09775q0rd185m6zz98krg0fp45j8kr0
    Issue TrackingMailing ListVendor Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/07/msg00009.html

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.