Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-4j3c-42xv-3f84
Advisory ID github_osv/GHSA-4j3c-42xv-3f84
Aliases CVE-2025-52434
Summary Apache Tomcat is vulnerable to resource exhaustion when using the APR/Native connector 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.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
System Score Found at
cvssv3.1 7.5 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/07/GHSA-4j3c-42xv-3f84/GHSA-4j3c-42xv-3f84.json
cvssv4 6.3 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/07/GHSA-4j3c-42xv-3f84/GHSA-4j3c-42xv-3f84.json
generic_textual MODERATE
Reference id Reference type URL
https://github.com/apache/tomcat
https://github.com/apache/tomcat/commit/8a83c3c42d20762782678932c14005cd3397a018
https://lists.apache.org/thread/gxgh65004f25y8519coth6w7vchww030
https://lists.debian.org/debian-lts-announce/2025/07/msg00009.html
http://www.openwall.com/lists/oss-security/2025/07/10/11
CVE-2025-52434 https://nvd.nist.gov/vuln/detail/CVE-2025-52434
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/07/GHSA-4j3c-42xv-3f84/GHSA-4j3c-42xv-3f84.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:U Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/07/GHSA-4j3c-42xv-3f84/GHSA-4j3c-42xv-3f84.json
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-07-11T14:02:46Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2025/52xxx/CVE-2025-52434.json

Source Advisory: vulnrichment/CVE-2025-52434

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'yes'},
 {'Technical Impact': 'partial'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]