CVE-2023-42794
No exploitation reported by the sources we read.
- Published2023-10-10
- Fixed in9.0.81 · 8.5.94
- WeaknessCWE-459
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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.
Timeline
dates in UTC- 2023-10-1018:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-42794?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-42794?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD · OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 9.0 | ≥ 9.0.70, < 9.0.81 | 9.0.81 | NVD · OSV |
| 8.5 | ≥ 8.5.85, < 8.5.94 | 8.5.94 | NVD · OSV |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- tomcatAlmaLinux:9all versions · fixed in 1:9.0.62-37.el9_3.1and 7 other packages
- tomcatAlmaLinux:8all versions · fixed in 1:9.0.62-27.el8_9.2and 7 other packages
Vendor advisories
Red Hat Security Advisory: Red Hat Fuse 7.12.1 release and security update
Fix
- Update Apache Tomcat to 9.0.81 · 8.5.94
- Vendor fix Red Hat Product Security RHSA-2023:7247 · 1 productBefore applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on. The References section of this erratum contains a download link (you must log in to download the update).
- Workaround from the vendor Red Hat Product Security RHSA-2023:7247 · 1 productNo mitigation is currently available for this flaw.
Advisories and patches
- lists.apache.orgVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Published
- 2023-10-10
- Last Modified
- 2026-10-08
- NVD status
- Modified
Frequently asked questions
What is CVE-2023-42794?
Is CVE-2023-42794 actively exploited?
What is the CVSS score for CVE-2023-42794?
Running Apache Tomcat? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.