Vulnerability · CVE-2021-25329
CVE-2021-25329 is listed by The fix for CVE-2020-9484 was incomplete..
Published Mar 1, 2021 · catalog updated Oct 8, 2026 · Oracle
Check if you run it
No confirmed exploitation is on record for CVE-2021-25329. EPSS is 9.49%. Act only if a listed version of Oracle is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High7.0
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 9.49%
- Remediation
- Advisory link
- Affected products
- cpe apache/tomcat
CVE-2021-25329 is listed by The fix for CVE-2020-9484 was incomplete..
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe apache/tomcat9.0.0
How to fix CVE-2021-25329
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2021-25329. EPSS is 9.49%. Act only if a listed version of Oracle is installed.
Which versions are affected?
Compare what you have installed with 9.0.0. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 9.49%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Mar 1, 2021 · Oracle Critical Patch Updates
Detected
CVE-2021-25329 is listed by The fix for CVE-2020-9484 was incomplete..
Oct 8, 2026 · Oracle Critical Patch Updates
Updated
CVE-2021-25329 is listed by The fix for CVE-2020-9484 was incomplete..
Sources
- CVE.orgVulnerability recordCVE-2021-25329
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2021-25329
30-day exploitation probability 9.5%
first.org - Oracle Critical Patch UpdatesVendor advisoryCVE-2021-25329
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-2020-94
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.