CVE-2021-43980

lowpriority · track · 16EPSS 0.024 · 84 %ileDEEUNLUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
2.36% (84th) EPSS
CVSS 3.7 · low
Is it mine?
96 products
Check your exposure
Who says so?
6 sources
cnnvd · enisa_euvd · osv · cert_bund

EPSS · scored 2026-10-22

The simplified implementation of blocking reads and writes introduced in Tomcat 10 and back-ported to Tomcat 9.0.47 onwards exposed a long standing (but extremely hard to trigger) concurrency bug in Apache Tomcat 10.1.0 to 10.1.0-M12, 10.0.0-M1 to 10.0.18, 9.0.0-M1 to 9.0.60 and 8.5.0 to 8.5.77 that could cause client connections to share an Http11Processor instance resulting in responses, or part responses, to be received by the wrong client.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • Fixedtomcat-0:9.0.115-3.160.1.noarch as component of SUSE Linux Enterprise Server 12 SP5-LTSSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedtomcat-0:9.0.115-3.160.1.noarch as component of SUSE Linux Enterprise Server LTSS Extended Security 12 SP5suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedtomcat-admin-webapps-0:9.0.115-3.160.1.noarch as component of SUSE Linux Enterprise Server 12 SP5-LTSSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedtomcat-admin-webapps-0:9.0.115-3.160.1.noarch as component of SUSE Linux Enterprise Server LTSS Extended Security 12 SP5suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedtomcat-docs-webapp-0:9.0.115-3.160.1.noarch as component of SUSE Linux Enterprise Server 12 SP5-LTSSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedtomcat-docs-webapp-0:9.0.115-3.160.1.noarch as component of SUSE Linux Enterprise Server LTSS Extended Security 12 SP5suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedtomcat-el-3_0-api-0:9.0.115-3.160.1.noarch as component of SUSE Linux Enterprise Server 12 SP5-LTSSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedtomcat-el-3_0-api-0:9.0.115-3.160.1.noarch as component of SUSE Linux Enterprise Server LTSS Extended Security 12 SP5suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedtomcat-javadoc-0:9.0.115-3.160.1.noarch as component of SUSE Linux Enterprise Server 12 SP5-LTSSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedtomcat-javadoc-0:9.0.115-3.160.1.noarch as component of SUSE Linux Enterprise Server LTSS Extended Security 12 SP5suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedtomcat-jsp-2_3-api-0:9.0.115-3.160.1.noarch as component of SUSE Linux Enterprise Server 12 SP5-LTSSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedtomcat-jsp-2_3-api-0:9.0.115-3.160.1.noarch as component of SUSE Linux Enterprise Server LTSS Extended Security 12 SP5suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedtomcat-lib-0:9.0.115-3.160.1.noarch as component of SUSE Linux Enterprise Server 12 SP5-LTSSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedtomcat-lib-0:9.0.115-3.160.1.noarch as component of SUSE Linux Enterprise Server LTSS Extended Security 12 SP5suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedtomcat-servlet-4_0-api-0:9.0.115-3.160.1.noarch as component of SUSE Linux Enterprise Server 12 SP5-LTSSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedtomcat-servlet-4_0-api-0:9.0.115-3.160.1.noarch as component of SUSE Linux Enterprise Server LTSS Extended Security 12 SP5suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedtomcat-webapps-0:9.0.115-3.160.1.noarch as component of SUSE Linux Enterprise Server 12 SP5-LTSSsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedtomcat-webapps-0:9.0.115-3.160.1.noarch as component of SUSE Linux Enterprise Server LTSS Extended Security 12 SP5suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

02

cvss

Technical severity, 0–10. One row per scoring source.

7.5
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–high · 3.4–7.5

v3.13.7lowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:Nprimary · NVD / NIST USexploitability 2.2 · impact 1.4
v3.13.7lowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondary · ENISA EU
v3.13.7lowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondaryexploitability 2.2 · impact 1.4
v3.13.7lowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondary · OSV
v3.13.4lowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)
v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · SUSE Product Security
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · NCSC-NL NL
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-362USCWE-362USCWE-362US
05

affected products (96)

Products and version ranges known to be affected.

showing 20 of 96
06

advisories (7)

Vendor and ecosystem advisories describing this.

  • NCSC-2025-0123Kwetsbaarheden verholpen in Oracle Database ProductenNL2025-04-16csaf · ncsc_nlNL

    Oracle heeft kwetsbaarheden verholpen in diverse Oracle Database Producten en subsystemen, zoals Oracle Server, NoSQL, TimesTen, Secure Backup en Essbase.

  • SUSE-SU-2026:1058-1Security update for tomcat2026-03-26csaf · suse_csafDE

    Security update for tomcat

  • WID-SEC-W-2022-1558Apache Tomcat: Schwachstelle ermöglicht Offenlegung von InformationenDeutsch2022-09-28csaf · cert_bundDE

    Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Apache Tomcat ausnutzen, um Informationen offenzulegen.

  • WID-SEC-W-2024-0528Dell Data Protection Advisor: Mehrere SchwachstellenDeutsch2024-02-29csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in Dell Data Protection Advisor ausnutzen, um beliebigen Code auszuführen, einen Denial-of-Service-Zustand herbeizuführen, Dateien zu manipulieren, vertrauliche Informationen offenzulegen, seine Berechtigungen zu erweitern oder einen nicht spezifizierten Angriff durchzuführen.

  • WID-SEC-W-2024-1238HPE HP-UX: Mehrere SchwachstellenDeutsch2024-05-27csaf · cert_bundDE

    Ein anonymer oder lokaler Angreifer kann mehrere Schwachstellen in HPE HP-UX Tomcat Servlet Engine ausnutzen, um Sicherheitsmaßnahmen zu umgehen, einen Denial-of-Service-Zustand zu verursachen, vertrauliche Informationen offenzulegen oder Dateien zu manipulieren.

  • GHSA-jx7c-7mj5-9438Apache Tomcat Race Condition vulnerability2022-09-29ghsa · osvUS

    The simplified implementation of blocking reads and writes introduced in Tomcat 10 and back-ported to Tomcat 9.0.47 onwards exposed a long standing (but extremely hard to trigger) concurrency bug in Apache Tomcat 10.1.0 to 10.1.0-M12, 10.0.0-M1 to 10.0.18, 9.0.0-M1 to 9.0.60 and 8.5.0 to 8.5.77 that could cause client connections to share an Http11Processor instance resulting in responses, or part responses, to be received by the wrong client.

  • BIT-tomcat-2021-43980Apache Tomcat: Information disclosure2024-03-06vendor · osvUS

    The simplified implementation of blocking reads and writes introduced in Tomcat 10 and back-ported to Tomcat 9.0.47 onwards exposed a long standing (but extremely hard to trigger) concurrency bug in Apache Tomcat 10.1.0 to 10.1.0, 10.0.0 to 10.0.18, 9.0.0 to 9.0.60 and 8.5.0 to 8.5.77 that could cause client connections to share an Http11Processor instance resulting in responses, or part responses, to be received by the wrong client.

07

also known as (5)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdosvcert_bundncsc_nlsuse_csafNVDCVE.orgMITRE
published 2022-09-28modified 2026-06-17
09

references (21)

External citations — patches, advisories, analysis.

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