What is the CVSS score of CVE-2025-53506?

CVE-2025-53506 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.2%.

Which versions of Tomcat are affected by CVE-2025-53506?

Apache Tomcat versions 8.5 through 11.0 contain a vulnerability that allows attackers to exhaust server resources through malformed HTTP/2 requests, potentially causing service degradation or…. A patch is available.

How to fix or mitigate CVE-2025-53506?

Within 24 hours: Inventory all systems running Tomcat versions 8.5.0-11.0.8 and assess exposure to untrusted HTTP/2 clients. Within 7 days: Implement compensating controls (disable HTTP/2 or apply WAF rules filtering non-compliant HTTP/2 handshakes) on critical systems. Within 30 days: Upgrade all affected Tomcat instances to versions 11.0.9, 10.1.43, or 9.0.107.

Tomcat CVE-2025-53506

EUVD-2025-21032 HIGH

Uncontrolled Resource Consumption (CWE-400)

2025-07-10 security@apache.org

GHSA-25xr-qj8w-c4vf

Apache Tomcat Denial Of Service Java Red Hat Suse

7.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Ubuntu

MEDIUM

qualitative

SUSE

HIGH

qualitative

Red Hat

5.3 MEDIUM

qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

EUVD ID Assigned

Mar 16, 2026 - 06:52 euvd

EUVD-2025-21032

Analysis Generated

Mar 16, 2026 - 06:52 vuln.today

CVE Published

Jul 10, 2025 - 20:15 nvd

HIGH 7.5

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

4 maven packages depend on org.apache.tomcat.embed:tomcat-embed-core (4 direct, 0 indirect)
3 maven packages depend on org.apache.tomcat:tomcat-coyote (3 direct, 0 indirect)

Ecosystem-wide dependent count for version 8.5.0 and other introduced versions.

DescriptionCVE.org

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.

AnalysisAI

A remote code execution vulnerability (CVSS 7.5). High severity vulnerability requiring prompt remediation.

Technical ContextAI

CWE-400 (Uncontrolled Resource Consumption). CVSS 7.5 indicates high severity.

RemediationAI

Monitor vendor channels for patch availability.

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Vendor StatusVendor

Ubuntu

Priority: Medium

tomcat10

Release	Status	Version
jammy	DNE	-
noble	needed	-
upstream	released	10.1.43
plucky	ignored	end of life, was needed
questing	needed	-

tomcat11

Release	Status	Version
jammy	DNE	-
noble	DNE	-
plucky	DNE	-
upstream	released	11.0.9
questing	needed	-

tomcat9

Release	Status	Version
noble	not-affected	9.0.70-2ubuntu0.1
plucky	not-affected	-
upstream	released	9.0.70-2
bionic	needed	-
focal	needed	-
jammy	needed	-
questing	not-affected	-

Debian

Bug #1109114

tomcat10

Release	Status	Fixed Version	Urgency
bookworm	fixed	10.1.52-1~deb12u1	-
bookworm (security)	fixed	10.1.52-1~deb12u1	-
trixie (security), trixie	fixed	10.1.52-1~deb13u1	-
forky, sid	fixed	10.1.52-1	-
trixie	fixed	10.1.52-1~deb13u1	-
(unstable)	fixed	10.1.46-1	-

tomcat11

Release	Status	Fixed Version	Urgency
trixie (security), trixie	fixed	11.0.15-1~deb13u1	-
forky, sid	fixed	11.0.18-1	-
trixie	fixed	11.0.15-1~deb13u1	-
(unstable)	fixed	11.0.11-1	-

tomcat9

Release	Status	Fixed Version	Urgency
bullseye	fixed	9.0.107-0+deb11u1	-
bullseye (security)	fixed	9.0.107-0+deb11u2	-
bookworm	fixed	9.0.70-2	-
trixie	fixed	9.0.95-1	-
forky, sid	fixed	9.0.115-1	-
(unstable)	fixed	9.0.70-2	-

DLA-4244-1 DSA-6120-1 DSA-6121-1

SUSE

Severity: High

Product	Status
Container suse/manager/5.0/x86_64/server:5.0.5.1.7.33.2 Container suse/multi-linux-manager/5.1/x86_64/server:5.1.1.8.7.1 Image SLES15-SP4-Manager-Server-4-3-BYOS Image SLES15-SP4-Manager-Server-4-3-BYOS-Azure Image SLES15-SP4-Manager-Server-4-3-BYOS-EC2 Image SLES15-SP4-Manager-Server-4-3-BYOS-GCE	Affected
SUSE Enterprise Storage 7.1	Fixed
SUSE Liberty Linux 8	Fixed
SUSE Liberty Linux 9	Fixed
SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS	Fixed

CVE-2025-53506 vulnerability details – vuln.today

Back

Tomcat CVE-2025-53506

Severity by source

CVSS VectorNVD

Lifecycle Timeline

Blast Radius

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

More in Tomcat

Same weakness CWE-400 – Uncontrolled Resource Consumption

Same technique Denial Of Service

Vendor StatusVendor

Ubuntu

Debian

SUSE

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External POC / Exploit Code