CVE catalog

CVE-2021-43980

tomcat9: CVE-2021-43980

Severity: Medium · CVSS 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Published: Sep 28, 2022, 2:15:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 2.36% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	tomcat9	sid	`9.0.122-1`	fixed
Debian	tomcat9	forky	`9.0.122-1`	fixed
Debian	tomcat9	trixie	`9.0.95-1`	fixed
Debian	tomcat9	bookworm	`9.0.70-2`	fixed
Ubuntu	tomcat8	pro	`8.5.21-1ubuntu1`	vulnerable
Ubuntu	tomcat8	pro	`8.5.29-1`	vulnerable
Ubuntu	tomcat8	pro	`8.5.30-1`	vulnerable
Ubuntu	tomcat8	pro	`8.5.30-1ubuntu1`	vulnerable
Ubuntu	tomcat8	pro	`8.5.30-1ubuntu1.2`	vulnerable
Ubuntu	tomcat8	pro	`8.5.30-1ubuntu1.3`	vulnerable
Ubuntu	tomcat8	pro	`8.5.30-1ubuntu1.4`	vulnerable
Ubuntu	tomcat8	pro	`8.5.39-1ubuntu1~18.04.1`	vulnerable
Ubuntu	tomcat8	pro	`8.5.39-1ubuntu1~18.04.2`	vulnerable
Ubuntu	tomcat8	pro	`8.5.39-1ubuntu1~18.04.3`	vulnerable
Ubuntu	tomcat8	pro	`8.5.39-1ubuntu1~18.04.3+esm1`	vulnerable
Ubuntu	tomcat8	pro	`8.5.39-1ubuntu1~18.04.3+esm2`	vulnerable
Ubuntu	tomcat8	pro	`8.5.39-1ubuntu1~18.04.3+esm3`	vulnerable
Ubuntu	tomcat8	pro	`8.5.39-1ubuntu1~18.04.3+esm4`	vulnerable
Ubuntu	tomcat8	pro	`8.5.39-1ubuntu1~18.04.3+esm5`	vulnerable
Ubuntu	tomcat8	pro	`8.5.39-1ubuntu1~18.04.3+esm6`	vulnerable
Ubuntu	tomcat9	pro	`9.0.43-3`	vulnerable
Ubuntu	tomcat9	pro	`9.0.54-1`	vulnerable
Ubuntu	tomcat9	pro	`9.0.55-1`	vulnerable
Ubuntu	tomcat9	pro	`9.0.58-1`	vulnerable
Ubuntu	tomcat9	pro	`9.0.58-1ubuntu0.1`	vulnerable
Ubuntu	tomcat9	pro	`9.0.58-1ubuntu0.1+esm1`	vulnerable
Ubuntu	tomcat9	pro	`9.0.58-1ubuntu0.1+esm2`	vulnerable
Ubuntu	tomcat9	pro	`9.0.58-1ubuntu0.1+esm3`	vulnerable
Ubuntu	tomcat9	pro	`9.0.58-1ubuntu0.1+esm4`	vulnerable
Ubuntu	tomcat9	pro	`9.0.58-1ubuntu0.2`	vulnerable
Ubuntu	tomcat9	pro	`9.0.58-1ubuntu0.2+esm1`	vulnerable
Ubuntu	tomcat9	pro	`9.0.58-1ubuntu0.2+esm2`	vulnerable
Ubuntu	tomcat9	pro	`9.0.58-1ubuntu0.2+esm3`	vulnerable
Ubuntu	tomcat9	pro	`9.0.58-1ubuntu0.2+esm4`	vulnerable
Suse	tomcat	linux enterprise high performance computing 15-espos	`9.0.36-150000.3.101.2`	fixed
Suse	tomcat	linux enterprise high performance computing 15-ltss	`9.0.36-150000.3.101.2`	fixed
Suse	tomcat	linux enterprise server 15-ltss	`9.0.36-150000.3.101.2`	fixed
Suse	tomcat	linux enterprise server for sap applications 15	`9.0.36-150000.3.101.2`	fixed
Suse	tomcat	linux enterprise high performance computing 15 sp1-espos	`9.0.36-150100.4.81.1`	fixed
Suse	tomcat	linux enterprise high performance computing 15 sp1-ltss	`9.0.36-150100.4.81.1`	fixed
Suse	tomcat	linux enterprise server 15 sp1-bcl	`9.0.36-150100.4.81.1`	fixed
Suse	tomcat	linux enterprise server 15 sp1-ltss	`9.0.36-150100.4.81.1`	fixed
Suse	tomcat	linux enterprise server for sap applications 15 sp1	`9.0.36-150100.4.81.1`	fixed
Suse	tomcat	enterprise storage 6	`9.0.36-150100.4.81.1`	fixed
Opensuse	tomcat	tumbleweed	`9.0.43-11.1`	fixed
Suse	tomcat	linux enterprise server 12 sp5	`9.0.36-3.90.1`	fixed
Suse	tomcat	linux enterprise server for sap applications 12 sp5	`9.0.36-3.90.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	tomcat9	source	sid	`9.0.62-1`	not yet assigned	Not reported	Not reported
Debian	tomcat9	source	forky	`9.0.62-1`	not yet assigned	Not reported	Not reported
Debian	tomcat9	source	trixie	`9.0.62-1`	not yet assigned	Not reported	Not reported
Debian	tomcat9	source	bookworm	`9.0.62-1`	not yet assigned	Not reported	Not reported
Suse	tomcat	rpm	linux enterprise high performance computing 15-espos	`9.0.36-150000.3.101.2`	Not reported	SUSE-SU-2022:4221-1	Not reported
Suse	tomcat	rpm	linux enterprise high performance computing 15-ltss	`9.0.36-150000.3.101.2`	Not reported	SUSE-SU-2022:4221-1	Not reported
Suse	tomcat	rpm	linux enterprise server 15-ltss	`9.0.36-150000.3.101.2`	Not reported	SUSE-SU-2022:4221-1	Not reported
Suse	tomcat	rpm	linux enterprise server for sap applications 15	`9.0.36-150000.3.101.2`	Not reported	SUSE-SU-2022:4221-1	Not reported
Suse	tomcat	rpm	linux enterprise high performance computing 15 sp1-espos	`9.0.36-150100.4.81.1`	Not reported	SUSE-SU-2022:4257-1	Not reported
Suse	tomcat	rpm	linux enterprise high performance computing 15 sp1-ltss	`9.0.36-150100.4.81.1`	Not reported	SUSE-SU-2022:4257-1	Not reported
Suse	tomcat	rpm	linux enterprise server 15 sp1-bcl	`9.0.36-150100.4.81.1`	Not reported	SUSE-SU-2022:4257-1	Not reported
Suse	tomcat	rpm	linux enterprise server 15 sp1-ltss	`9.0.36-150100.4.81.1`	Not reported	SUSE-SU-2022:4257-1	Not reported
Suse	tomcat	rpm	linux enterprise server for sap applications 15 sp1	`9.0.36-150100.4.81.1`	Not reported	SUSE-SU-2022:4257-1	Not reported
Suse	tomcat	rpm	enterprise storage 6	`9.0.36-150100.4.81.1`	Not reported	SUSE-SU-2022:4257-1	Not reported
Opensuse	tomcat	rpm	tumbleweed	`9.0.43-11.1`	Not reported	OPENSUSE-SU-2024:12534-1	Not reported
Suse	tomcat	rpm	linux enterprise server 12 sp5	`9.0.36-3.90.1`	Not reported	SUSE-SU-2022:4009-1	Not reported
Suse	tomcat	rpm	linux enterprise server for sap applications 12 sp5	`9.0.36-3.90.1`	Not reported	SUSE-SU-2022:4009-1	Not reported

OpenFactory catalog packages

[openSUSE Tumbleweed]

[tomcat-admin-webapps]Unknown
Source package: [tomcat]
Details (1)
- 9.0.120-2.1 · noarch · tumbleweed
  Unknown · Fixed: 9.0.43-11.1
  Version impact unknown
  dsa · tomcat · opensuse · tumbleweed
[tomcat-docs-webapp]Unknown
Source package: [tomcat]
Details (1)
- 9.0.120-2.1 · noarch · tumbleweed
  Unknown · Fixed: 9.0.43-11.1
  Version impact unknown
  dsa · tomcat · opensuse · tumbleweed
[tomcat-el-3_0-api]Unknown
Source package: [tomcat]
Details (1)
- 9.0.120-2.1 · noarch · tumbleweed
  Unknown · Fixed: 9.0.43-11.1
  Version impact unknown
  dsa · tomcat · opensuse · tumbleweed
[tomcat-embed]Unknown
Source package: [tomcat]
Details (1)
- 9.0.120-2.1 · noarch · tumbleweed
  Unknown · Fixed: 9.0.43-11.1
  Version impact unknown
  dsa · tomcat · opensuse · tumbleweed
[tomcat-javadoc]Unknown
Source package: [tomcat]
Details (1)
- 9.0.120-2.1 · noarch · tumbleweed
  Unknown · Fixed: 9.0.43-11.1
  Version impact unknown
  dsa · tomcat · opensuse · tumbleweed
[tomcat-jsp-2_3-api]Unknown
Source package: [tomcat]
Details (1)
- 9.0.120-2.1 · noarch · tumbleweed
  Unknown · Fixed: 9.0.43-11.1
  Version impact unknown
  dsa · tomcat · opensuse · tumbleweed
[tomcat-jsvc]Unknown
Source package: [tomcat]
Details (1)
- 9.0.120-2.1 · noarch · tumbleweed
  Unknown · Fixed: 9.0.43-11.1
  Version impact unknown
  dsa · tomcat · opensuse · tumbleweed
[tomcat-lib]Unknown
Source package: [tomcat]
Details (1)
- 9.0.120-2.1 · noarch · tumbleweed
  Unknown · Fixed: 9.0.43-11.1
  Version impact unknown
  dsa · tomcat · opensuse · tumbleweed
[tomcat-servlet-4_0-api]Unknown
Source package: [tomcat]
Details (1)
- 9.0.120-2.1 · noarch · tumbleweed
  Unknown · Fixed: 9.0.43-11.1
  Version impact unknown
  dsa · tomcat · opensuse · tumbleweed
[tomcat-webapps]Unknown
Source package: [tomcat]
Details (1)
- 9.0.120-2.1 · noarch · tumbleweed
  Unknown · Fixed: 9.0.43-11.1
  Version impact unknown
  dsa · tomcat · opensuse · tumbleweed
[tomcat]Fixed
Source package: [tomcat]
Details (1)
- 9.0.120-2.1 · noarch · tumbleweed
  Fixed · Fixed: 9.0.43-11.1
  dsa · tomcat · opensuse · tumbleweed

[Debian 12 (Bookworm)]

[libtomcat9-java]Fixed
Source package: [tomcat9]
Details (2)
- 9.0.70-2 · all · bookworm
  Fixed · Fixed: 9.0.62-1
  dsa · tomcat9 · debian · bookworm; dsa · tomcat9 · debian · 12
- 9.0.70-2 · all · bookworm
  Fixed · Fixed: 9.0.62-1
  dsa · tomcat9 · debian · bookworm; dsa · tomcat9 · debian · 12

[Debian 13 (Trixie)]

[libtomcat9-java]Fixed
Source package: [tomcat9]
Details (2)
- 9.0.95-1 · all · trixie
  Fixed · Fixed: 9.0.62-1
  dsa · tomcat9 · debian · 13
- 9.0.95-1 · all · trixie
  Fixed · Fixed: 9.0.62-1
  dsa · tomcat9 · debian · 13

Observed: Oct 23, 2026, 6:03:29 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]