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CVE-2023-42794 Apache Tomcat

Affected softwareApache Tomcat
Severity5.9 Medium CVSS 3.1
Fixed in9.0.81, 8.5.94
WeaknessCWE-459
Published10 Oct 2023
Updated8 Oct 2026

Description

Incomplete Cleanup vulnerability in Apache Tomcat. The internal fork of Commons FileUpload packaged with Apache Tomcat 9.0.70 through 9.0.80 and 8.5.85 through 8.5.93 included an unreleased, in progress refactoring that exposed a potential denial of service on Windows if a web application opened a stream for an uploaded file but failed to close the stream. The file would never be deleted from disk creating the possibility of an eventual denial of service due to the disk being full. Other, EOL versions may also be affected. Users are recommended to upgrade to version 9.0.81 onwards or 8.5.94 onwards, which fixes the issue.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. Published 3 years ago.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 2.3% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update January 2024 ↗ CPU 2024-Q1 Oracle Communications Applications / Core (Apache Tomcat) (5.5.0-5.5.19, 6.0.0-6.0.3)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Communications Applications Core (Apache Tomcat) 5.5.0-5.5.19, 6.0.0-6.0.3

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.apache.tomcat:tomcat-coyote 9.0.70 9.0.81 unbounded
org.apache.tomcat:tomcat-coyote 8.5.85 8.5.94 unbounded

Products and versions

2 products, 4 version entries
SourceVendorProductSchemeAffected versions
nvd apache tomcat generic ≥ 8.5.85 and < 8.5.94 · ≥ 9.0.70 and < 9.0.81
osv org.apache.tomcat tomcat-coyote generic ≥ 8.5.85 and < 8.5.94 · ≥ 9.0.70 and < 9.0.81

References

URLTags
https://github.com/apache/tomcat PACKAGE
https://lists.apache.org/thread/vvbr2ms7lockj1hlhz5q3wmxb2mwcw82 WEB
http://www.openwall.com/lists/oss-security/2023/10/10/8 WEB

Timeline

Published2023-10-10By the CVE Program.
NVD record modified2026-10-08NVD's own last-modified date for this record.