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Fencer Vulns
high 7.0

CVE-2021-25329 json

Incomplete fix for CVE-2020-9484

published 2021-03-01 5 y ago modified 2026-10-08 31 d ago also BIT-tomcat-2021-25329 , EUVD-2021-0677 , GHSA-jgwr-3qm3-26f3

cvss
7.0
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
9.5%
EPSS 9.5% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

The fix for CVE-2020-9484 was incomplete. When using Apache Tomcat 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41, 8.5.0 to 8.5.61 or 7.0.0. to 7.0.107 with a configuration edge case that was highly unlikely to be used, the Tomcat instance was still vulnerable to CVE-2020-9494. Note that both the previously published prerequisites for CVE-2020-9484 and the previously published mitigations for CVE-2020-9484 also apply to this issue.

Patch / fix

  • maven org.apache.tomcat.embed:tomcat-embed-core 7.0.108, 8.5.61, 9.0.41, 10.0.2
  • bitnami tomcat 7.0.108, 8.5.62, 9.0.42, 10.0.1
  • Apache Software Foundation Apache Tomcat 7.0.107, 8.5.61, 9.0.41, 10.0.0
  • tomcat9 Debian 14, Debian 13, Debian 12 9.0.43-1

debian advisories DEBIAN-CVE-2021-25329

  • tomcat9 Ubuntu 18.04 LTS 9.0.16-3ubuntu0.18.04.2
  • tomcat9 Ubuntu 20.04 LTS 9.0.31-1ubuntu0.2
  • tomcat7 Ubuntu Pro 14.04 LTS 7.0.52-1ubuntu0.16+esm1
  • tomcat7 Ubuntu Pro 16.04 LTS 7.0.68-1ubuntu0.4+esm2
  • tomcat7 Ubuntu Pro 18.04 LTS 7.0.78-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2021-25329

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • jws5-ecj jboss enterprise web server 5.5 4.12.0-3.redhat_2.2.el7jws
  • jws5-ecj jboss enterprise web server 5.5 4.12.0-3.redhat_2.2.el8jws
  • jws5-tomcat jboss enterprise web server 5.5 9.0.43-11.redhat_00011.1.el7jws
  • jws5-tomcat jboss enterprise web server 5.5 9.0.43-11.redhat_00011.1.el8jws
  • jws5-tomcat-lib jboss enterprise web server 5.5 9.0.43-11.redhat_00011.1.el7jws
  • jws5-tomcat-lib jboss enterprise web server 5.5 9.0.43-11.redhat_00011.1.el8jws
  • jws5-mod_cluster jboss enterprise web server 5.5 1.4.3-2.Final_redhat_00002.1.el7jws
  • jws5-mod_cluster jboss enterprise web server 5.5 1.4.3-2.Final_redhat_00002.1.el8jws

red hat advisories RHSA-2021:2561

  • tomcat SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +4 more 8.0.53-29.46.1
  • tomcat6 SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 6.0.53-0.57.19.1
  • tomcat SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +6 more 9.0.36-4.58.1
  • tomcat SLE Module for Web and Scripting 15 SP2 9.0.36-3.24.1
  • tomcat SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 9.0.36-3.79.1
  • tomcat SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +3 more 9.0.36-3.64.1
  • tomcat SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 9.0.115-3.160.1

suse advisories SUSE-SU-2026:1058-1SUSE-SU-2021:1431-1SUSE-SU-2021:14705-1SUSE-SU-2021:1009-1SUSE-SU-2021:1008-1SUSE-SU-2021:0989-1

  • tomcat openSUSE Tumbleweed 9.0.36-8.4
  • tomcat10 openSUSE Tumbleweed 10.1.14-1.1
  • tomcat openSUSE Leap 15.2 9.0.36-lp152.2.22.1

opensuse advisories openSUSE-SU-2024:11468-1openSUSE-SU-2024:13441-1openSUSE-SU-2021:0496-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-25329 updated cvss 7.0

tomcat: Incomplete fix for CVE-2020-9484 (RCE via session persistence)

  • Red Hat Enterprise Linux 6 tomcat6, tomcat6-lib, tomcat6-log4j, tomcat6-javadoc, tomcat6-webapps, tomcat6-el-2.1-api, +4 more Red Hat Enterprise Linux 7 tomcat, tomcat-lib, tomcat-jsvc, tomcat-javadoc, tomcat-webapps, tomcat-el-2.2-api, +4 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 pki-servlet-engine, pki-servlet-4.0-api
    affected: workaround, no fix available “Fix deferred”
  • Red Hat JBoss Data Grid 6 jbossweb jbossweb Red Hat JBoss Data Virtualization 6 jbossweb jbossweb Red Hat JBoss Enterprise Application Platform 6 jbossweb jbossweb Red Hat JBoss Fuse 6 tomcat
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat JBoss Web Server 3 tomcat
    affected: workaround, no fix planned “Will not fix”
  • Red Hat OpenStack Platform 10 (Newton) opendaylight
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat OpenStack Platform 13 (Queens) opendaylight
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Fuse 7.11
    fixed: vendor fix RHSA-2022:5532
  • Red Hat JBoss Web Server 5
    fixed: vendor fix RHSA-2021:2562
show 3 more
  • Red Hat JBoss Web Server 5.5 for RHEL 7 Server jws5-ecj 4.12.0-3.redhat_2.2.el7jws, jws5-tomcat 9.0.43-11.redhat_00011.1.el7jws, jws5-tomcat-native 1.2.26-3.redhat_3.el7jws, jws5-tomcat-lib 9.0.43-11.redhat_00011.1.el7jws, jws5-tomcat-javadoc 9.0.43-11.redhat_00011.1.el7jws, jws5-tomcat-selinux 9.0.43-11.redhat_00011.1.el7jws, +12 more Red Hat JBoss Web Server 5.5 for RHEL 8 jws5-ecj 4.12.0-3.redhat_2.2.el8jws, jws5-tomcat 9.0.43-11.redhat_00011.1.el8jws, jws5-tomcat-native 1.2.26-3.redhat_3.el8jws, jws5-tomcat-lib 9.0.43-11.redhat_00011.1.el8jws, jws5-tomcat-javadoc 9.0.43-11.redhat_00011.1.el8jws, jws5-tomcat-selinux 9.0.43-11.redhat_00011.1.el8jws, +10 more
    fixed: vendor fix RHSA-2021:2561
  • Red Hat support for Spring Boot 2.3.10
    fixed: vendor fix RHSA-2021:3425
  • Red Hat Decision Manager 7 tomcat Red Hat Process Automation 7 tomcat
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
31 d ago

Exploit prediction

9.49% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
GitHub 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 4.4 AV:L/AC:M/Au:N/C:P/I:P/A:P
OSV 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
maven org.apache.tomcat.embed:tomcat-embed-core
>=10.0.0-M1, <10.0.2
>=9.0.0, <9.0.41
>=8.0.0, <8.5.61
>=7.0.0, <7.0.108
10.0.2
9.0.41
8.5.61
7.0.108
bitnami tomcat
>=7.0.0, <7.0.108
>=8.5.0, <8.5.62
>=9.0.0, <9.0.42
>=10.0.0, <10.0.1
7.0.108
8.5.62
9.0.42
10.0.1

Affected products

  • Apache Software Foundation Apache Tomcat

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.