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CVE-2021-25329
Incomplete fix for CVE-2020-9484
High7.0EPSS 9.5%
- Published
- Updated
- Reserved
- Assigned by
- apache
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.
Timeline
ID reserved
By apache
- 41 days later
· 41 days later
Published
- 6 years later
· 6 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | High7.0 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 9.5% · top 4.5% of all CVEs (8 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.0.
Weakness
- Remote code execution via session persistence
Affected products
Apache Software Foundation · Apache Tomcat
- affected Apache Tomcat 10 – < 10.0.0
- affected Apache Tomcat 9 – < 9.0.41
- affected Apache Tomcat 8.5 – < 8.5.61
- affected Apache Tomcat 7 – < 7.0.107
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Mavenorg.apache.tomcat.embed:tomcat-embed-coreGHSA-jgwr-3qm3-26f3 (opens in a new tab)
References (17)
- https://lists.apache.org/thread.html/rfe62fbf9d4c314f166fe8c668e50e5d9dd882a99447f26f0367474bf%40%3Cannounce.tomcat.apache.org%3E (opens in a new tab)x_refsource_MISCmailing-listx_refsource_MLISTx_transferred
- [tomcat-dev] 20210301 [SECURITY] CVE-2021-25329 Apache Tomcat Incomplete fix for CVE-2020-9484 (RCE via session persistence) (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [announce] 20210301 [SECURITY] CVE-2021-25329 Apache Tomcat Incomplete fix for CVE-2020-9484 (RCE via session persistence) (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [tomcat-users] 20210301 [SECURITY] CVE-2021-25329 Apache Tomcat Incomplete fix for CVE-2020-9484 (RCE via session persistence) (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [tomcat-dev] 20210301 svn commit: r1887027 - in /tomcat/site/trunk: docs/security-10.html docs/security-7.html docs/security-8.html docs/security-9.html xdocs/security-10.xml xdocs/security-7.xml xdocs/security-8.xml xdocs/security-9.xml (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [oss-security] 20210301 CVE-2021-25329: Apache Tomcat Incomplete fix for CVE-2020-9484 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [debian-lts-announce] 20210316 [SECURITY] [DLA 2596-1] tomcat8 security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- DSA-4891 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- [tomcat-users] 20210701 What is "h2c"? What is CVE-2021-25329? Re: Most recent security-related update to 8.5 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [tomcat-users] 20210701 Re: What is "h2c"? What is CVE-2021-25329? Re: Most recent security-related update to 8.5 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [tomcat-users] 20210702 Re: What is "h2c"? What is CVE-2021-25329? Re: Most recent security-related update to 8.5 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [tomcat-users] 20210702 Re: CVE-2021-25329, was Re: Most recent security-related update to 8.5 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- https://www.oracle.com//security-alerts/cpujul2021.html (opens in a new tab)x_refsource_MISCx_transferred
- https://security.netapp.com/advisory/ntap-20210409-0002/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://www.oracle.com/security-alerts/cpuoct2021.html (opens in a new tab)x_refsource_MISCx_transferred
- https://www.oracle.com/security-alerts/cpujan2022.html (opens in a new tab)x_refsource_MISCx_transferred
- GLSA-202208-34 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-jgwr-3qm3-26f3 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-25329)Record last updated .