What is the CVSS score of CVE-2025-52520?

CVE-2025-52520 has a contested CVSS base score of 7.5 from a third party (e.g. CISA-ADP), while the vendor rates it High. vuln.today uses the vendor rating as authoritative.

Which versions of Tomcat are affected by CVE-2025-52520?

Apache Tomcat instances are vulnerable to a denial-of-service attack through integer overflow in multipart upload handling, potentially allowing attackers to bypass file size restrictions and…. A patch is available.

How to fix or mitigate CVE-2025-52520?

Within 24 hours: Inventory all Tomcat deployments and identify affected versions (9.0.0-9.0.106, 10.1.0-10.1.42, 11.0.0-11.0.8). Within 7 days: Implement compensating controls (WAF rules limiting multipart uploads, network rate limiting) on critical systems and test patches in non-production. Within 30 days: Complete upgrade to patched versions (9.0.107, 10.1.43, or 11.0.9) across all production environments.

Tomcat CVE-2025-52520

EUVD-2025-21044 HIGH

Integer Overflow or Wraparound (CWE-190)

2025-07-10 security@apache.org

GHSA-wr62-c79q-cv37

Apache Tomcat Integer Overflow Java Denial Of Service Red Hat Suse

High

Disputed · 7.5 NVD

Severity by source

Sources disagree (Low–High)

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

3.7 LOW

qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

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-2025-21044

Analysis Generated

Mar 16, 2026 - 06:52 vuln.today

CVE Published

Jul 10, 2025 - 19:15 nvd

HIGH 7.5

Blast Radius

ecosystem impact

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

2 maven packages depend on org.apache.tomcat.embed:tomcat-embed-core (2 direct, 0 indirect)
2 maven packages depend on org.apache.tomcat:tomcat-catalina (2 direct, 0 indirect)

Ecosystem-wide dependent count for version 11.0.0-M1 and other introduced versions.

DescriptionCVE.org

For some unlikely configurations of multipart upload, an Integer Overflow vulnerability in Apache Tomcat could lead to a DoS via bypassing of size limits.

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, older, 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

CVE-2025-52520 is an integer overflow vulnerability in Apache Tomcat's multipart upload handling that allows unauthenticated remote attackers to bypass size limits and trigger denial of service. The vulnerability affects Tomcat versions 11.0.0-M1 through 11.0.8, 10.1.0-M1 through 10.1.42, 9.0.0.M1 through 9.0.106, and EOL version 8.5.0 through 8.5.100, requiring only network access with no authentication. With a CVSS score of 7.5 (High severity) and an attack vector rated as Network/Low complexity, this represents a significant availability risk for unpatched deployments.

Technical ContextAI

The vulnerability resides in Apache Tomcat's multipart form data upload processing mechanism (typically invoked via HTTP POST requests with Content-Type: multipart/form-data). The root cause is CWE-190 (Integer Overflow or Wraparound), where integer arithmetic operations on Content-Length or chunk size calculations fail to properly validate boundaries before multiplication or addition, causing wraparound to smaller values. This allows attackers to bypass configured maxPostSize or maxFileSize limits by crafting multipart requests with specially crafted size headers that overflow during integer calculations. The affected CPE would be cpe:2.3:a:apache:tomcat, with specific version ranges: 11.0.0-M1 through 11.0.8, 10.1.0-M1 through 10.1.42, 9.0.0.M1 through 9.0.106, and unsupported 8.5.0-8.5.100.

RemediationAI

Upgrade to patched versions; details: ['Upgrade to Apache Tomcat 11.0.9 or later for 11.x branch', 'Upgrade to Apache Tomcat 10.1.43 or later for 10.1.x branch', 'Upgrade to Apache Tomcat 9.0.107 or later for 9.0.x branch', 'Note: Version 8.5.x is EOL; consider migrating to supported versions rather than applying backports'] Workaround: Reduce attack surface if patching is delayed; details: ['Disable multipart form upload handling if not required by application', 'Implement strict Content-Length validation at reverse proxy/load balancer level before traffic reaches Tomcat', 'Configure firewall rules to restrict POST requests with multipart/form-data content type to trusted sources only', 'Monitor access logs for unusually large Content-Length headers in POST requests'] Vendor Advisory: Consult official Apache Tomcat security documentation; details: Refer to Apache Tomcat Security Documentation and release notes for versions 11.0.9, 10.1.43, and 9.0.107 for detailed patch information and changelog entries related to CVE-2025-52520

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9.3

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7.5

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7.5

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8.8

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 #1109112

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-2025-52520 vulnerability details – vuln.today

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Tomcat CVE-2025-52520

Severity by source

CVSS VectorNVD

Lifecycle Timeline

Blast Radius

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

More in Tomcat

Same weakness CWE-190 – Integer Overflow or Wraparound

Same technique Integer Overflow

Vendor StatusVendor

Ubuntu

Debian

SUSE

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External POC / Exploit Code