NVD / CVE Program· CNA apache

CVE-2023-42794: Apache Tomcat: FileUpload: DoS due to accumulation of temporary files on Windows

Noroxi assessment

Priority: Monitor (action score 24/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 2.3% (FIRST EPSS); higher than 83.4% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
According to CISA the attack is automatable: targets can be found by mass scanning.
Fixed version: Apache Software Foundation Apache Tomcat 9.0.81.
Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Apache Software Foundation Apache Tomcat 9.0.81 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.9 · v3.1—No exploit Fix available

Published: Oct 10, 2023
Updated: Oct 8, 2026
EPSS: 2.3% · 83th percentile
CWE: CWE-459

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 23 / 40 · 5.9 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 1 / 30 · 2.3%

CISA SSVC decision

Exploitation: none
Automatable: yes
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
apache	tomcat	cpe:2.3:a:apache:tomcat

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

apache tomcat8.5.85 and later · before 8.5.94
apache tomcat9.0.70 and later · before 9.0.81

Versions reported by the vendor

Affected version ranges reported by the assigning authority (apache). Independent of NVD's CPE analysis and usually ahead of it.

Apache Software Foundation Apache Tomcat
- 9.0.70 and later · up to and including 9.0.80affected · semver
- 8.5.85 and later · up to and including 8.5.93affected · semver
- 10.0.0-M1 and later · up to and including 10.0.27unknown · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
AlmaLinux:8	tomcat	before 1:9.0.62-27.el8_9.2	1:9.0.62-27.el8_9.2
AlmaLinux:8	tomcat-admin-webapps	before 1:9.0.62-27.el8_9.2	1:9.0.62-27.el8_9.2
AlmaLinux:8	tomcat-docs-webapp	before 1:9.0.62-27.el8_9.2	1:9.0.62-27.el8_9.2
AlmaLinux:8	tomcat-el-3.0-api	before 1:9.0.62-27.el8_9.2	1:9.0.62-27.el8_9.2
AlmaLinux:8	tomcat-jsp-2.3-api	before 1:9.0.62-27.el8_9.2	1:9.0.62-27.el8_9.2
AlmaLinux:8	tomcat-lib	before 1:9.0.62-27.el8_9.2	1:9.0.62-27.el8_9.2
AlmaLinux:8	tomcat-servlet-4.0-api	before 1:9.0.62-27.el8_9.2	1:9.0.62-27.el8_9.2
AlmaLinux:8	tomcat-webapps	before 1:9.0.62-27.el8_9.2	1:9.0.62-27.el8_9.2
AlmaLinux:9	tomcat	before 1:9.0.62-37.el9_3.1	1:9.0.62-37.el9_3.1
AlmaLinux:9	tomcat-admin-webapps	before 1:9.0.62-37.el9_3.1	1:9.0.62-37.el9_3.1
AlmaLinux:9	tomcat-docs-webapp	before 1:9.0.62-37.el9_3.1	1:9.0.62-37.el9_3.1
AlmaLinux:9	tomcat-el-3.0-api	before 1:9.0.62-37.el9_3.1	1:9.0.62-37.el9_3.1
AlmaLinux:9	tomcat-jsp-2.3-api	before 1:9.0.62-37.el9_3.1	1:9.0.62-37.el9_3.1
AlmaLinux:9	tomcat-lib	before 1:9.0.62-37.el9_3.1	1:9.0.62-37.el9_3.1
AlmaLinux:9	tomcat-servlet-4.0-api	before 1:9.0.62-37.el9_3.1	1:9.0.62-37.el9_3.1
AlmaLinux:9	tomcat-webapps	before 1:9.0.62-37.el9_3.1	1:9.0.62-37.el9_3.1
Maven	org.apache.tomcat:tomcat-coyote	from 8.5.85 · before 8.5.94	8.5.94
Maven	org.apache.tomcat:tomcat-coyote	from 9.0.70 · before 9.0.81	9.0.81
openSUSE:Leap 15.5	tomcat	before 9.0.85-150200.57.1	9.0.85-150200.57.1
openSUSE:Tumbleweed	tomcat	before 9.0.82-2.1	9.0.82-2.1
Red Hat:enterprise_linux:8::appstream	tomcat	before 1:9.0.62-27.el8_9.2	1:9.0.62-27.el8_9.2
Red Hat:enterprise_linux:8::appstream	tomcat-admin-webapps	before 1:9.0.62-27.el8_9.2	1:9.0.62-27.el8_9.2
Red Hat:enterprise_linux:8::appstream	tomcat-docs-webapp	before 1:9.0.62-27.el8_9.2	1:9.0.62-27.el8_9.2
Red Hat:enterprise_linux:8::appstream	tomcat-el-3.0-api	before 1:9.0.62-27.el8_9.2	1:9.0.62-27.el8_9.2

+13

Same product

apache: all records

Other highest-scoring records for the same primary product.

CVE-2025-24813Apache Tomcat: Potential RCE and/or information disclosure and/or information corruption with partial PUTKEV
99Now
CVE-2016-8735Remote code execution is possible with Apache Tomcat before 6.0.48, 7.x before 7.0.73, 8.x before 8.0.39, 8.5.x before 8.5.7, and 9.x…KEV
96Now
CVE-2017-12617When running Apache Tomcat versions 9.0.0.M1 to 9.0.0, 8.5.0 to 8.5.22, 8.0.0.RC1 to 8.0.46 and 7.0.0 to 7.0.81 with HTTP PUTs enabled (e.g.KEV
92Now

Published before and after this one in the same product

← EarlierCVE-2023-42795Oct 10, 2023 · Apache Tomcat: Failure during request clean-up leads to sensitive data leaking to subsequent requests
22Monitor
← EarlierCVE-2023-45648Oct 10, 2023 · Apache Tomcat: Trailer header parsing too lenient
23Monitor
Later →CVE-2023-46589Nov 28, 2023 · Apache Tomcat: HTTP request smuggling via malformed trailer headers
31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Apache Software Foundation Apache Tomcat	9.0.81 · description	Vendor (CNA)
almalinux:tomcat	1:9.0.62-27.el8_9.2 · AlmaLinux:8	Package registry (OSV)
almalinux:tomcat-admin-webapps	1:9.0.62-27.el8_9.2 · AlmaLinux:8	Package registry (OSV)
almalinux:tomcat-docs-webapp	1:9.0.62-27.el8_9.2 · AlmaLinux:8	Package registry (OSV)
almalinux:tomcat-el-3.0-api	1:9.0.62-27.el8_9.2 · AlmaLinux:8	Package registry (OSV)
almalinux:tomcat-jsp-2.3-api	1:9.0.62-27.el8_9.2 · AlmaLinux:8	Package registry (OSV)
almalinux:tomcat-lib	1:9.0.62-27.el8_9.2 · AlmaLinux:8	Package registry (OSV)
almalinux:tomcat-servlet-4.0-api	1:9.0.62-27.el8_9.2 · AlmaLinux:8	Package registry (OSV)
almalinux:tomcat-webapps	1:9.0.62-27.el8_9.2 · AlmaLinux:8	Package registry (OSV)
Maven:org.apache.tomcat:tomcat-coyote	8.5.94	Package registry (OSV)
Maven:org.apache.tomcat:tomcat-coyote	9.0.81	Package registry (OSV)
opensuse:tomcat	9.0.85-150200.57.1 · openSUSE:Leap 15.5	Package registry (OSV)
red hat:tomcat	1:9.0.62-27.el8_9.2 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:tomcat-admin-webapps	1:9.0.62-27.el8_9.2 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:tomcat-docs-webapp	1:9.0.62-27.el8_9.2 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:tomcat-el-3.0-api	1:9.0.62-27.el8_9.2 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:tomcat-jsp-2.3-api	1:9.0.62-27.el8_9.2 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:tomcat-lib	1:9.0.62-27.el8_9.2 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:tomcat-servlet-4.0-api	1:9.0.62-27.el8_9.2 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:tomcat-webapps	1:9.0.62-27.el8_9.2 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
suse:tomcat	9.0.85-150200.57.1 · SUSE:Linux Enterprise Module for Web and Scripting 15 SP5	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Mohammad Khedmatgozar (cellbox)finder

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).