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Vulnerability details: VCID-9kfe-1esf-uydm
Vulnerability ID VCID-9kfe-1esf-uydm
Aliases CVE-2025-52434
GHSA-4j3c-42xv-3f84
Summary 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 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3 5.3 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-52434.json
epss 0.00401 https://api.first.org/data/v1/epss?cve=CVE-2025-52434
epss 0.00401 https://api.first.org/data/v1/epss?cve=CVE-2025-52434
epss 0.00531 https://api.first.org/data/v1/epss?cve=CVE-2025-52434
epss 0.00531 https://api.first.org/data/v1/epss?cve=CVE-2025-52434
epss 0.00531 https://api.first.org/data/v1/epss?cve=CVE-2025-52434
epss 0.00531 https://api.first.org/data/v1/epss?cve=CVE-2025-52434
epss 0.00531 https://api.first.org/data/v1/epss?cve=CVE-2025-52434
epss 0.00531 https://api.first.org/data/v1/epss?cve=CVE-2025-52434
apache_tomcat Important https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-52434
cvssv3.1 5.9 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-4j3c-42xv-3f84
cvssv3.1 7.5 https://github.com/apache/tomcat
cvssv4 6.3 https://github.com/apache/tomcat
generic_textual MODERATE https://github.com/apache/tomcat
cvssv3.1 7.5 https://github.com/apache/tomcat/commit/8a83c3c42d20762782678932c14005cd3397a018
cvssv4 6.3 https://github.com/apache/tomcat/commit/8a83c3c42d20762782678932c14005cd3397a018
generic_textual MODERATE https://github.com/apache/tomcat/commit/8a83c3c42d20762782678932c14005cd3397a018
cvssv3.1 7.5 https://lists.apache.org/thread/gxgh65004f25y8519coth6w7vchww030
cvssv4 6.3 https://lists.apache.org/thread/gxgh65004f25y8519coth6w7vchww030
generic_textual MODERATE https://lists.apache.org/thread/gxgh65004f25y8519coth6w7vchww030
ssvc Track https://lists.apache.org/thread/gxgh65004f25y8519coth6w7vchww030
cvssv3.1 7.5 https://lists.debian.org/debian-lts-announce/2025/07/msg00009.html
cvssv4 6.3 https://lists.debian.org/debian-lts-announce/2025/07/msg00009.html
generic_textual MODERATE https://lists.debian.org/debian-lts-announce/2025/07/msg00009.html
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2025-52434
cvssv4 6.3 https://nvd.nist.gov/vuln/detail/CVE-2025-52434
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2025-52434
cvssv3.1 7.5 http://www.openwall.com/lists/oss-security/2025/07/10/11
cvssv4 6.3 http://www.openwall.com/lists/oss-security/2025/07/10/11
generic_textual MODERATE http://www.openwall.com/lists/oss-security/2025/07/10/11
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-52434.json
https://api.first.org/data/v1/epss?cve=CVE-2025-52434
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
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
https://nvd.nist.gov/vuln/detail/CVE-2025-52434
http://www.openwall.com/lists/oss-security/2025/07/10/11
2379382 https://bugzilla.redhat.com/show_bug.cgi?id=2379382
CVE-2025-52434 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-52434
GHSA-4j3c-42xv-3f84 https://github.com/advisories/GHSA-4j3c-42xv-3f84
RHSA-2025:11695 https://access.redhat.com/errata/RHSA-2025:11695
RHSA-2025:11696 https://access.redhat.com/errata/RHSA-2025:11696
RHSA-2025:14177 https://access.redhat.com/errata/RHSA-2025:14177
RHSA-2025:14178 https://access.redhat.com/errata/RHSA-2025:14178
RHSA-2025:14180 https://access.redhat.com/errata/RHSA-2025:14180
RHSA-2025:14181 https://access.redhat.com/errata/RHSA-2025:14181
RHSA-2025:14182 https://access.redhat.com/errata/RHSA-2025:14182
RHSA-2025:14183 https://access.redhat.com/errata/RHSA-2025:14183
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-52434.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

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Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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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/apache/tomcat
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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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/apache/tomcat
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)

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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/apache/tomcat/commit/8a83c3c42d20762782678932c14005cd3397a018
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

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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/apache/tomcat/commit/8a83c3c42d20762782678932c14005cd3397a018
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)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://lists.apache.org/thread/gxgh65004f25y8519coth6w7vchww030
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

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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://lists.apache.org/thread/gxgh65004f25y8519coth6w7vchww030
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

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-07-11T14:02:46Z/ Found at https://lists.apache.org/thread/gxgh65004f25y8519coth6w7vchww030
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://lists.debian.org/debian-lts-announce/2025/07/msg00009.html
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

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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://lists.debian.org/debian-lts-announce/2025/07/msg00009.html
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

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2025-52434
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

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none

required

unchanged

changed

high

low

none

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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://nvd.nist.gov/vuln/detail/CVE-2025-52434
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)

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adjacent

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at http://www.openwall.com/lists/oss-security/2025/07/10/11
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

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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 http://www.openwall.com/lists/oss-security/2025/07/10/11
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)

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Exploit Prediction Scoring System (EPSS)
Percentile 0.60729
EPSS Score 0.00401
Published At April 2, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:38:06.878569+00:00 Apache Tomcat Importer Import https://tomcat.apache.org/security-9.html 38.0.0