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CVE-2023-28709

52
FAUCET Score

CVE-2023-28709 is an incomplete fix for CVE-2023-24998 affecting Apache Tomcat versions 11.0.0-M2 to 11.0.0-M4, 10.1.5 to 10.1.7, 9.0.71 to 9.0.73, and 8.5.85 to 8.5.87, as well as related Debian and NetApp products. This vulnerability allows for a denial of service if specific non-default HTTP connector settings are used and a request with exactly maxParameterCount query string parameters is submitted, bypassing the limit for uploaded request parts. With a CVSS score of 7.5 (HIGH), it has a low attack complexity and requires no privileges or user interaction, posing a significant availability risk. There is currently no known active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or KEV listing, but it has garnered moderate community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 8.5.85, <= 8.5.87CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
>= 9.0.71, <= 9.0.73CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
>= 10.1.5, <= 10.1.7CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
11.0.0CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:11.0.0:milestone2:*:*:*:*:*:*
11.0.0CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:11.0.0:milestone3:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
49.94%
Probability of exploitation in next 30 days
EPSS Percentile
98.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.4994 is in the 98th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (16)

mavenpatch availablevia ghsa
Product: org.apache.tomcat.embed:tomcat-embed-coreFixed in: 11.0.0-M5
mavenpatch availablevia ghsa
Product: org.apache.tomcat.embed:tomcat-embed-coreFixed in: 10.1.8
mavenpatch availablevia ghsa
Product: org.apache.tomcat.embed:tomcat-embed-coreFixed in: 9.0.74
mavenpatch availablevia ghsa
Product: org.apache.tomcat:tomcat-coyoteFixed in: 8.5.88
redhatpatch availablevia redhat_api
Product: JWS 5.7.4 releaseFixed in: tomcat
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: tomcat-1:9.0.62-27.el8_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: tomcat-1:9.0.62-37.el9_3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 5.7 on RHEL 7Fixed in: jws5-tomcat-0:9.0.62-15.redhat_00013.1.el7jws
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 5.7 on RHEL 8Fixed in: jws5-tomcat-0:9.0.62-15.redhat_00013.1.el8jws
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 5.7 on RHEL 9Fixed in: jws5-tomcat-0:9.0.62-15.redhat_00013.1.el9jws
View patch
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: pki-deps:10.6/pki-servlet-engine
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: pki-servlet-engine
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: pki-servlet-engine
redhatend of lifevia redhat_api
Product: Red Hat JBoss Web Server 3Fixed in: tomcat
redhatend of lifevia redhat_api
Product: Red Hat JBoss Web Server 3Fixed in: tomcat7
redhatend of lifevia redhat_api
Product: Red Hat JBoss Web Server 3Fixed in: tomcat8

Vendor Advisories (2)

mavenGHSA-cx6h-86xw-9x34high

Apache Tomcat - Fix for CVE-2023-24998 was incomplete

Jul 6, 2023
redhatCVE-2023-28709Moderate

tomcat: Fix for CVE-2023-24998 was incomplete

May 22, 2023

References

lists.apache.org / thread/7wvxonzwb7k9hx9jt3q33cmy7j97jo3j
Mailing ListVendor Advisory
security.gentoo.org / glsa/202305-37
Third Party Advisory
security.netapp.com / advisory/ntap-20230616-0004
Third Party Advisory
debian.org / security/2023/dsa-5521
Third Party Advisory
openwall.com / lists/oss-security/2023/05/22/1
Mailing ListThird Party Advisory