`CVE-2024-56337` Apache Tomcat

Affected software	Apache Tomcat
Severity	9.8 Critical CVSS 3.1
Fixed in	`11.0.2`, `10.1.34`
Weakness	CWE-367
Published	20 Dec 2024
Updated	17 Jun 2026

Description

Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.1, from 10.1.0-M1 through 10.1.33, from 9.0.0.M1 through 9.0.97. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 though 8.5.100. Other, older, EOL versions may also be affected. The mitigation for CVE-2024-50379 was incomplete. Users running Tomcat on a case insensitive file system with the default servlet write enabled (readonly initialisation parameter set to the non-default value of false) may need additional configuration to fully mitigate CVE-2024-50379 depending on which version of Java they are using with Tomcat: - running on Java 8 or Java 11: the system property sun.io.useCanonCaches must be explicitly set to false (it defaults to true) - running on Java 17: the system property sun.io.useCanonCaches, if set, must be set to false (it defaults to false) - running on Java 21 onwards: no further configuration is required (the system property and the problematic cache have been removed) Tomcat 11.0.3, 10.1.35 and 9.0.99 onwards will include checks that sun.io.useCanonCaches is set appropriately before allowing the default servlet to be write enabled on a case insensitive file system. Tomcat will also set sun.io.useCanonCaches to false by default where it can.

Exploitation status

Exploited

Real-world exploitation reported by VulnCheck KEV. CISA has not confirmed it.

CISA KEV not listed
VulnCheck KEV listed Exploitation reported in the wild. Honeypot sightings · 5 exploits · earliest 2026-10-14.
CISA Vulnrichment exploitation: none
Indexed PoC none indexed
EPSS 9.0% chance in 30 days

VulnCheck KEV

Exploitation evidence from VulnCheck Known Exploited Vulnerabilities (VulnCheck KEV), used under VulnCheck's community terms. View CVE-2024-56337 in VulnCheck (free account).

Evidence	Source	Detail	Date
Honeypot sighting	VulnCheck canaries	Exploitation attempts seen on 1 day	2026-10-14
Exploit reference	VulnCheck XDB b36e52f820a2	Exploit type: initial-access	2025-02-27
Exploit reference	VulnCheck XDB 56f4255a86ee	Exploit type: initial-access	2025-03-04
Exploit reference	VulnCheck XDB 0721f5dd0289	Exploit type: initial-access	2025-03-10
Exploit reference	VulnCheck XDB ec9c5cff3b78	Exploit type: initial-access	2025-03-15
Exploit reference	VulnCheck XDB 168c8da3d32f	Exploit type: initial-access	2025-03-22

Evidence

Source

Detail

Date

Honeypot sighting

VulnCheck canaries

Exploitation attempts seen on 1 day

2026-10-14

Exploit reference

VulnCheck XDB b36e52f820a2

Exploit type: initial-access

2025-02-27

Exploit reference

VulnCheck XDB 56f4255a86ee

Exploit type: initial-access

2025-03-04

Exploit reference

VulnCheck XDB 0721f5dd0289

Exploit type: initial-access

2025-03-10

Exploit reference

VulnCheck XDB ec9c5cff3b78

Exploit type: initial-access

2025-03-15

Exploit reference

VulnCheck XDB 168c8da3d32f

Exploit type: initial-access

2025-03-22

Waratek protection

Mitigation candidate

A kind of vulnerability Waratek's rules address, with exploit code published or exploitation reported. No rule exists and none is planned yet. The decision below says what we found to build a rule from.

Protection none
Action unverified
Review automated Inferred
Record active

Decided by	The affected package being open source on Maven, so the fix can be read
Finding	This CVE affects an open-source Java library published on Maven Central (Maven packages: org.apache.tomcat:tomcat-catalina, org.apache.tomcat:tomcat-embed-core, org.apache.tomcat.embed:tomcat-embed-core), so it is squarely in ARMR's territory and the source needed to understand the defect is public. That makes it a candidate for an ARMR patch rule. No rule exists and none is scheduled: the diff between the affected and fixed versions has not been read, and a closer look may find no hook point ARMR can act on.

Decided by

The affected package being open source on Maven, so the fix can be read

Finding

This CVE affects an open-source Java library published on Maven Central (Maven packages: org.apache.tomcat:tomcat-catalina, org.apache.tomcat:tomcat-embed-core, org.apache.tomcat.embed:tomcat-embed-core), so it is squarely in ARMR's territory and the source needed to understand the defect is public. That makes it a candidate for an ARMR patch rule. No rule exists and none is scheduled: the diff between the affected and fixed versions has not been read, and a closer look may find no hook point ARMR can act on.

Affected software and releases

Oracle advisories

Advisory	Type	Quarter	Products Oracle names in its risk matrix
Oracle Critical Patch Update April 2025 ↗	CPU	2025-Q2	Oracle Communications / Automated Test Suite (Apache Tomcat) (24.2.0) Oracle Communications / BEServer (Apache Tomcat) (24.3.0) Oracle Financial Services Applications / Installer (Apache Tomcat) (8.1.2.7.0) Oracle Fusion Middleware / Runtime Server (Apache Tomcat) (12.2.1.4.0) Oracle Supply Chain / Document Management (Apache Tomcat) (6.2.1)
Oracle Critical Patch Update January 2025 ↗	CPU	2025-Q1	Oracle Communications / Configuration Management Platform (Apache Tomcat) (15.0.0.0.0)

Advisory

Type

Quarter

Products Oracle names in its risk matrix

Oracle Critical Patch Update April 2025 ↗

CPU

2025-Q2

Oracle Communications / Automated Test Suite (Apache Tomcat) (24.2.0)
Oracle Communications / BEServer (Apache Tomcat) (24.3.0)
Oracle Financial Services Applications / Installer (Apache Tomcat) (8.1.2.7.0)
Oracle Fusion Middleware / Runtime Server (Apache Tomcat) (12.2.1.4.0)
Oracle Supply Chain / Document Management (Apache Tomcat) (6.2.1)

Oracle Critical Patch Update January 2025 ↗

CPU

2025-Q1

Oracle Communications / Configuration Management Platform (Apache Tomcat) (15.0.0.0.0)

Oracle components and versions

Family	Component	Versions, as Oracle lists them	Read as
Oracle Communications	Automated Test Suite (Apache Tomcat)	24.2.0	24.2.0
Oracle Communications	BEServer (Apache Tomcat)	24.3.0	24.3.0
Oracle Communications	Configuration Management Platform (Apache Tomcat)	15.0.0.0.0	15.0.0.0.0
Oracle Financial Services Applications	Installer (Apache Tomcat)	8.1.2.7.0	8.1.2.7.0
Oracle Fusion Middleware	Runtime Server (Apache Tomcat)	12.2.1.4.0	12.2.1.4.0
Oracle Supply Chain	Document Management (Apache Tomcat)	6.2.1	6.2.1

Maven packages

Affected and fixed versions, from OSV.dev

Package Introduced Fixed Last affected

org.apache.tomcat:tomcat-catalina 11.0.0-M1 11.0.2 unbounded

org.apache.tomcat:tomcat-catalina 10.1.0-M1 10.1.34 unbounded

org.apache.tomcat:tomcat-embed-core 9.0.0.M1 9.0.98 unbounded

org.apache.tomcat.embed:tomcat-embed-core 11.0.0-M1 11.0.2 unbounded

org.apache.tomcat.embed:tomcat-embed-core 10.1.0-M1 10.1.34 unbounded

org.apache.tomcat.embed:tomcat-embed-core 9.0.0.M1 9.0.98 unbounded

Package	Introduced	Fixed	Last affected
`org.apache.tomcat:tomcat-catalina`	11.0.0-M1	`11.0.2`	unbounded
`org.apache.tomcat:tomcat-catalina`	10.1.0-M1	`10.1.34`	unbounded
`org.apache.tomcat:tomcat-embed-core`	9.0.0.M1	`9.0.98`	unbounded
`org.apache.tomcat.embed:tomcat-embed-core`	11.0.0-M1	`11.0.2`	unbounded
`org.apache.tomcat.embed:tomcat-embed-core`	10.1.0-M1	`10.1.34`	unbounded
`org.apache.tomcat.embed:tomcat-embed-core`	9.0.0.M1	`9.0.98`	unbounded

Products and versions

5 products, 10 version entries

Source	Vendor	Product	Scheme	Affected versions
nvd	apache	tomcat	generic	≥ 9.0.0 and ＜ 9.0.98 · ≥ 10.1.0 and ＜ 10.1.34 · ≥ 11.0.0 and ＜ 11.0.2
nvd	netapp	bootstrap os	generic	any version
osv	org.apache.tomcat	tomcat-catalina	generic	≥ 10.1.0 and ＜ 10.1.34 · ≥ 11.0.0 and ＜ 11.0.2
osv	org.apache.tomcat	tomcat-embed-core	generic	≥ 9.0.0 and ＜ 9.0.98
osv	org.apache.tomcat.embed	tomcat-embed-core	generic	≥ 9.0.0 and ＜ 9.0.98 · ≥ 10.1.0 and ＜ 10.1.34 · ≥ 11.0.0 and ＜ 11.0.2

Source

Vendor

Product

Scheme

Affected versions

nvd

apache

tomcat

generic

≥ 9.0.0 and ＜ 9.0.98 · ≥ 10.1.0 and ＜ 10.1.34 · ≥ 11.0.0 and ＜ 11.0.2

nvd

netapp

bootstrap os

generic

any version

osv

org.apache.tomcat

tomcat-catalina

generic

≥ 10.1.0 and ＜ 10.1.34 · ≥ 11.0.0 and ＜ 11.0.2

osv

org.apache.tomcat

tomcat-embed-core

generic

≥ 9.0.0 and ＜ 9.0.98

osv

org.apache.tomcat.embed

tomcat-embed-core

generic

≥ 9.0.0 and ＜ 9.0.98 · ≥ 10.1.0 and ＜ 10.1.34 · ≥ 11.0.0 and ＜ 11.0.2

References

URL	Tags
https://github.com/apache/tomcat	PACKAGE
https://lists.apache.org/thread/b2b9qrgjrz1kvo4ym8y2wkfdvwoq6qbp	WEB
https://lists.debian.org/debian-lts-announce/2025/01/msg00009.html	WEB
https://security.netapp.com/advisory/ntap-20250103-0002	WEB
https://tomcat.apache.org/security-10.html#Fixed_in_Apache_Tomcat_10.1.34	WEB
https://tomcat.apache.org/security-11.html#Fixed_in_Apache_Tomcat_11.0.2	WEB
https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.98	WEB
https://www.cve.org/CVERecord?id=CVE-2024-50379	WEB
https://security.netapp.com/advisory/ntap-20250103-0002/	Third Party Advisory

URL

Timeline

Published	2024-12-20	By the CVE Program.
NVD record modified	2026-06-17	NVD's own last-modified date for this record.
VulnCheck KEV: earliest evidence	2026-10-14	Date of the oldest evidence of exploitation in VulnCheck KEV's record. VulnCheck does not publish the date it listed the CVE.

Published

2024-12-20

By the CVE Program.

NVD record modified

2026-06-17

NVD's own last-modified date for this record.

VulnCheck KEV: earliest evidence

2026-10-14

Date of the oldest evidence of exploitation in VulnCheck KEV's record. VulnCheck does not publish the date it listed the CVE.

How VRT decided (17 of 24 rules ran)

17 of 24 rules ran. The rest didn't run because an earlier rule had already settled the CVE.

# Rule Outcome Status Detail

identity: Does this identifier describe a vulnerability at all? the first rule that matches decides

1 rejected no match CVE Program withdrawal of this identifier

scope: Is it a vulnerability Waratek protects? the first rule that matches decides

2 armr-patch-file no match An ARMR patch file on disk for this CVE

3 armr-secure-rule-file no match An ARMR security-rule template on disk for this CVE

4 manual-classification no match A researcher's recorded decision for this specific CVE

5 manual classification no match Manual classification of this CVE in the legacy dataset

6 non-java-upstream no match A root cause in non-Java code: an OS kernel, a C library, or a bundled runtime

7 oracle-component no match The defect being in a component of a tracked product the agent does not reach: JavaFX, the Java SE installer, the JInitiator browser plug-in, the native WebLogic proxy plug-in, or a native part of Oracle Application Server or Collaboration Suite (HTTP Server, Web Cache, Internet Directory, mail and calendar servers). Oracle gives these no CPE of their own and names them only in the description.

8 java-client-side no match Oracle's own risk-matrix note saying the CVE is reached only through untrusted code in the Java sandbox (applets, Web Start) or only through a client installation of Java, so a server running its own trusted code is not exposed

9 osv-maven matched In scope Maven packages: org.apache.tomcat:tomcat-catalina, org.apache.tomcat:tomcat-embed-core, org.apache.tomcat.embed:tomcat-embed-core

10 cna-maven-package not reached An affected Maven artifact named by the CNA itself

11 known-cpe-product not reached An NVD CPE naming a product ARMR tracks

12 cna-cpe-product not reached A CPE the CNA published naming a tracked product. Oracle publishes these on advisory day, months before NVD.

13 oracle-advisory-family not reached A tracked product family named in Oracle's own risk matrix. CPE cannot carry a suite name, only a module.

14 cna-named-product not reached A tracked product named in words by the CVE's own CNA, on a record with no CPE yet. Apache and Eclipse publish these on advisory day, before NVD adds CPE data.

15 non-deployable-product not reached The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached

16 unmatched-product not reached No tracked product matched above, and none present at all

disposition: What do we do about one that is? every rule runs

17 patch-hint no match A reference pointing at the upstream fix: a commit, a PR, a Red Hat bug

18 open-source-maven decided it matched Mitigation candidate Open-source Maven artifact indexed by OSV (Maven packages: org.apache.tomcat:tomcat-catalina, org.apache.tomcat:tomcat-embed-core, org.apache.tomcat.embed:tomcat-embed-core). The source is public, which makes an ARMR patch rule a candidate; nothing here establishes that one can be written.

19 poc-derivable skipped An indexed exploit clearing the evidence bar to reverse-engineer, where there is no source to read

20 no-exploit skipped Nothing to build a rule from yet: no published exploit, no CISA record of exploitation and no source-level change to read

21 secure-rule-match no match A vulnerability class already blocked by an ARMR security rule

22 exploited-no-fix-or-poc skipped Somebody exploiting this CVE (a CISA or VulnCheck KEV listing, or a CISA verdict of active exploitation), with no fix, source code or PoC to build a rule from

23 below-action-threshold no match Severity is CRITICAL — only MEDIUM/LOW are deprioritized

24 no-exploit-published no match A CISA or VulnCheck KEV listing, a CISA verdict of active exploitation, a reviewed exploit catalogue, or a GitHub PoC with 5 or more stars carries this CVE — exploit code is in use or published, so it stays a candidate

Products the scope rules checked

The products this CVE's record names, and whether VRT tracks each one. The scope rules decided on these.

Vendor Product Tracked CPE Source

apache tomcat tracked cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* yaml

netapp bootstrap_os not tracked cpe:2.3:o:netapp:bootstrap_os:-:*:*:*:*:*:*:*

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