7.5

CVE-2025-52434: Apache Tomcat: APR/Native Connector crash leading to DoS

Modified
AliasesUBUNTU-CVE-2025-52434DEBIAN-CVE-2025-52434CGA-64xx-39rf-3mp9
Published 10-07-2025Last modified 04-11-2025

Vulnerability summary

CVE-2025-52434 is a high (CVSS 7.5) vulnerability in apache software foundation apache tomcat. EPSS estimates a 2.07% chance of exploitation in the next 30 days, higher than 81.4% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 2% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
2.07%
0%100%
Low · +0.09 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 12 · Related 4
DLA-4244-1MGASA-2025-0223OPENSUSE-SU-2025:15440-1RHSA-2025:11695RHSA-2025:14177RHSA-2025:14178

Timeline

  1. 10-07-2025
    PublishedVulnerability first disclosed.
  2. 04-11-2025
    Last modifiedVulnerability information updated.

Description

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in Apache Tomcat when using the APR/Native connector. This was particularly noticeable with client initiated closes of HTTP/2 connections. This issue affects Apache Tomcat: 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 9.0.107, which fixes the issue.

CVSS metrics

7 scores · 6 sources · 2 versions

EPSS trend

Probability

2.07%

Chance of exploitation in the next 30 days

Percentile

81%

Versus all other CVEs

30-day change

Increase +0.09 pp

From 1.98% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu2 products
  • tomcat8All versions (No fix recorded)
  • tomcat9All versions (No fix recorded)
Apache1 product
Apache software foundation1 product
Chainguard1 product
  • tomcat-8.5.87< 8.5.87-r6 | All versions (No fix recorded)
Debian1 product
  • tomcat9< 9.0.70-2
Org.apache.tomcat1 product
  • tomcat-coyote≥ 9.0.0.M1, < 9.0.107 | ≥ 8.5.0, ≤ 8.5.100
Org.apache.tomcat.embed1 product
  • tomcat-embed-core≥ 9.0.0.M1, < 9.0.107 | ≥ 8.5.0, ≤ 8.5.100

7 vendors · 8 products

References

10 links