No exploitation reportedFix available

CVE-2023-42795

Q: Is CVE-2023-42795 actively exploited?

Active exploitation of CVE-2023-42795 has not been confirmed. Its EPSS score was 2.5% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2023-42795?

CVE-2023-42795 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

No exploitation reported by the sources we read.

Published2023-10-10
Fixed in11.0.0-M12 · 10.1.14 · 9.0.81 · 8.5.94
WeaknessCWE-459

Am I 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.When recycling various internal objects in Apache Tomcat from 11.0.0-M1 through 11.0.0-M11, from 10.1.0-M1 through 10.1.13, from 9.0.0-M1 through 9.0.80 and from 8.5.0 through 8.5.93, an error could cause Tomcat to skip some parts of the recycling process leading to information leaking from the current request/response to the next. Older, EOL versions may also be affected. Users are recommended to upgrade to version 11.0.0-M12 onwards, 10.1.14 onwards, 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 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-42795?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-42795?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

OSV · NVD · CISA-ADP

Apache Tomcat

Branch	Affected	Fixed in	Source
11.0	≥ 11.0.0-M1, < 11.0.0-M12	11.0.0-M12	OSV
10.1	≥ 10.1.1, < 10.1.14	10.1.14	NVD · OSV
10.1	≥ 10.1.0-M1, < 10.1.14	10.1.14	OSV
9.0	≥ 9.0.1, < 9.0.81	9.0.81	NVD · OSV
9.0	≥ 9.0.0-M1, < 9.0.81	9.0.81	OSV
8.5	≥ 8.5.0, < 8.5.94	8.5.94	NVD · OSV
9.0	= 9.0.0	no fix published	NVD
10.1	= 10.1.0	no fix published	NVD
11.0	= 11.0.0	no fix published	NVD

Apache accumulo

Branch	Affected	Fixed in	Source
11.0	= 11.0.0-m1	no fix published	CISA-ADP
10.x	≥ 10.10-m1, ≤ 10.1.13	no fix published	CISA-ADP
9.0	≥ 9.0.0-m1, ≤ 9.0.80	no fix published	CISA-ADP
8.5	≥ 8.5.0, ≤ 8.5.93	no fix published	CISA-ADP

Debian debian linux

Branch	Affected	Fixed in	Source
10.0	= 10.0	no fix published	NVD
11.0	= 11.0	no fix published	NVD
12.0	= 12.0	no fix published	NVD

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

RHSA-2023:7247 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Red Hat Fuse 7.12.1 release and security update

Full record on NVD

Fix

Update Apache Tomcat to 11.0.0-M12 · 10.1.14 · 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
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2024-09-18
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.15.32024-09-18
NVDCVSS 3.15.3read 2026-10-23
CNAweakness (CWE)CWE-459read 2026-10-23
FIRST EPSSEPSS score2.5 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Published: 2023-10-10
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2023-42795?

Is CVE-2023-42795 actively exploited?

Active exploitation of CVE-2023-42795 has not been confirmed. Its EPSS score was 2.5% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-42795?

CVE-2023-42795 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

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