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CVE-2021-25329 Apache Tomcat

Affected softwareApache Tomcat
Severity7.0 High CVSS 3.1 2 scores
Fixed in10.0.2, 9.0.41, 8.5.61, 7.0.108
WeaknessDeserialization of untrusted data (CWE-502)
Published1 Mar 2021
Updated8 Oct 2026

Description

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.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. Published 5 years ago.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 9.5% chance in 30 days

Waratek protection

Protected by Waratek

Waratek has a rule that blocks attacks on this vulnerability.

Decided by A vulnerability class already blocked by an ARMR security rule
Finding Protected by Waratek's ARMR deserialization security rule, which blocks this class of attack at the JVM level without a rule written for this CVE specifically. The CVE's weakness is CWE-502: Deserialization of Untrusted Data.

How to mitigate CVE-2021-25329

Upgrade Apache Tomcat to a release that fixes it: 10.0.2, 9.0.41, 8.5.61 or 7.0.108. Until you can, Waratek RASP blocks exploitation with its deserialization and process rules. It runs inside the Java application, with no code changes.

Waratek RASP Runtime protection for Java applications

CVSS

7.0 HIGH v3.1 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 7.0 HIGH CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H NVD Primary published
CVSS 2.0 4.4 none AV:L/AC:M/Au:N/C:P/I:P/A:P NVD Primary

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update April 2025 ↗ CPU 2025-Q2 Oracle Autonomous Health Framework / Trace File Analyzer (Apache Tomcat) (23.8.0-23.11.0, 24.1.0-24.11.0, 25.1.0, 25.2.0)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Autonomous Health Framework Trace File Analyzer (Apache Tomcat) 23.8.0-23.11.0, 24.1.0-24.11.0, 25.1.0, 25.2.0 25.1.0 · 25.2.0

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.apache.tomcat.embed:tomcat-embed-core 10.0.0-M1 10.0.2 unbounded
org.apache.tomcat.embed:tomcat-embed-core 9.0.0 9.0.41 unbounded
org.apache.tomcat.embed:tomcat-embed-core 8.0.0 8.5.61 unbounded
org.apache.tomcat.embed:tomcat-embed-core 7.0.0 7.0.108 unbounded

Products and versions

13 products, 64 version entries
SourceVendorProductSchemeAffected versions
nvd apache tomcat generic ≥ 7.0.0 and ≤ 7.0.107 · ≥ 8.5.0 and ≤ 8.5.61 · 9.0.0:milestone1 · 9.0.0:milestone10 · 9.0.0:milestone11 · 9.0.0:milestone12 · 9.0.0:milestone13 · 9.0.0:milestone14 · 9.0.0:milestone15 · 9.0.0:milestone16 · 9.0.0:milestone17 · 9.0.0:milestone18 · 9.0.0:milestone19 · 9.0.0:milestone2 · 9.0.0:milestone20 · 9.0.0:milestone21 · 9.0.0:milestone22 · 9.0.0:milestone23 · 9.0.0:milestone24 · 9.0.0:milestone25 · 9.0.0:milestone26 · 9.0.0:milestone27 · 9.0.0:milestone3 · 9.0.0:milestone4 · 9.0.0:milestone5 · 9.0.0:milestone6 · 9.0.0:milestone7 · 9.0.0:milestone8 · 9.0.0:milestone9 · ≥ 9.0.0 and ≤ 9.0.41 · 10.0.0 · 10.0.0:milestone1 · 10.0.0:milestone10 · 10.0.0:milestone2 · 10.0.0:milestone3 · 10.0.0:milestone4 · 10.0.0:milestone5 · 10.0.0:milestone6 · 10.0.0:milestone7 · 10.0.0:milestone8 · 10.0.0:milestone9
nvd debian debian linux generic 9.0 · 10.0
nvd oracle agile product lifecycle management generic 9.3.3 · 9.3.6
nvd oracle communications cloud native core policy generic 1.14.0
nvd oracle communications cloud native core security edge protection proxy generic 1.6.0
nvd oracle communications instant messaging server generic 10.0.1.5.0
nvd oracle database generic 12.2.0.1 · 19c · 21c
nvd oracle graph server and client generic < 21.3.0
nvd oracle instantis enterprisetrack generic 17.1 · 17.2 · 17.3
nvd oracle managed file transfer generic 12.2.1.3.0 · 12.2.1.4.0
nvd oracle mysql enterprise monitor generic ≤ 8.0.23
nvd oracle siebel ui framework generic 21.9 · < 21.9
osv org.apache.tomcat.embed tomcat-embed-core generic ≥ 7.0.0 and < 7.0.108 · ≥ 8.0.0 and < 8.5.61 · ≥ 9.0.0 and < 9.0.41 · ≥ 10.0.0 and < 10.0.2

References

URLTags
https://github.com/apache/tomcat/commit/6d66e99ef85da93e4d2c2a536ca51aa3418bfaf4 WEB
https://www.oracle.com/security-alerts/cpuoct2021.html WEB
https://www.oracle.com/security-alerts/cpujan2022.html WEB
https://www.oracle.com//security-alerts/cpujul2021.html WEB
https://www.debian.org/security/2021/dsa-4891 WEB
https://security.netapp.com/advisory/ntap-20210409-0002 WEB
https://security.gentoo.org/glsa/202208-34 WEB
https://lists.debian.org/debian-lts-announce/2021/03/msg00018.html WEB
https://lists.apache.org/thread.html/rfe62fbf9d4c314f166fe8c668e50e5d9dd882a99447f26f0367474bf@%3Cusers.tomcat.apache.org%3E WEB
https://lists.apache.org/thread.html/rfe62fbf9d4c314f166fe8c668e50e5d9dd882a99447f26f0367474bf@%3Cdev.tomcat.apache.org%3E WEB

Timeline

Published2021-03-01By the CVE Program.
NVD record modified2026-10-08NVD's own last-modified date for this record.