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CVE-2021-25122

33
FAUCET Score

CVE-2021-25122 describes a request header and body duplication vulnerability in Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41, and 8.5.0 to 8.5.61, potentially allowing users to view other users' request data. Rated 7.5 HIGH on the CVSS scale, this vulnerability is network-exploitable with low attack complexity, posing a high risk to confidentiality without impacting integrity or availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 8.5.0, <= 8.5.61CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
>= 9.0.0, <= 9.0.41CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
9.0.0CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:9.0.0:milestone1:*:*:*:*:*:*
9.0.0CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:9.0.0:milestone10:*:*:*:*:*:*
9.0.0CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:9.0.0:milestone11:*:*:*:*:*:*

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:H/I:N/A:N

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

Exploit Intelligence

EPSS Score
18.11%
Probability of exploitation in next 30 days
EPSS Percentile
96.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.1811 is in the 95th 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

No media coverage found for this CVE.

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 (20)

mavenpatch availablevia ghsa
Product: org.apache.tomcat:tomcat-coyoteFixed in: 10.0.2
mavenpatch availablevia ghsa
Product: org.apache.tomcat.embed:tomcat-embed-coreFixed in: 8.5.63
mavenpatch availablevia ghsa
Product: org.apache.tomcat.embed:tomcat-embed-coreFixed in: 10.0.2
mavenpatch availablevia ghsa
Product: org.apache.tomcat.embed:tomcat-embed-coreFixed in: 9.0.43
oraclepatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 5.5 on RHEL 7Fixed in: jws5-tomcat-0:9.0.43-11.redhat_00011.1.el7jws
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 5.5 on RHEL 7Fixed in: jws5-tomcat-vault-0:1.1.8-2.Final_redhat_00003.1.el7jws
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 5.5 on RHEL 8Fixed in: jws5-ecj-0:4.12.0-3.redhat_2.2.el8jws
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 5.5 on RHEL 8Fixed in: jws5-mod_cluster-0:1.4.3-2.Final_redhat_00002.1.el8jws
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 5.5 on RHEL 8Fixed in: jws5-tomcat-0:9.0.43-11.redhat_00011.1.el8jws
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 5.5 on RHEL 8Fixed in: jws5-tomcat-native-0:1.2.26-3.redhat_3.el8jws
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 5.5 on RHEL 8Fixed in: jws5-tomcat-vault-0:1.1.8-2.Final_redhat_00003.1.el8jws
View patch
redhatpatch availablevia redhat_api
Product: Red Hat support for Spring Boot 2.3.10Fixed in: tomcat
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 5.5 on RHEL 7Fixed in: jws5-tomcat-native-0:1.2.26-3.redhat_3.el7jws
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Fuse 7.11Fixed in: tomcat
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 5Fixed in: tomcat
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 5.5 on RHEL 7Fixed in: jws5-ecj-0:4.12.0-3.redhat_2.2.el7jws
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 5.5 on RHEL 7Fixed in: jws5-mod_cluster-0:1.4.3-2.Final_redhat_00002.1.el7jws
View patch
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: pki-deps:10.6/pki-servlet-engine
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 13 (Queens)Fixed in: opendaylight

Vendor Advisories (2)

mavenGHSA-j39c-c8hj-x4j3high

Exposure of Sensitive Information to an Unauthorized Actor in Apache Tomcat

Jun 16, 2021
redhatCVE-2021-25122Moderate

tomcat: Request mix-up with h2c

Mar 1, 2021

References

lists.apache.org / thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cannounce.apache.org%3E
lists.apache.org / thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cannounce.tomcat.apache.org%3E
Mailing ListVendor Advisory
lists.apache.org / thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cdev.tomcat.apache.org%3E
lists.apache.org / thread.html/r7b95bc248603360501f18c8eb03bb6001ec0ee3296205b34b07105b7%40%3Cusers.tomcat.apache.org%3E
lists.apache.org / thread.html/rcd90bf36b1877e1310b87ecd14ed7bbb15da52b297efd9f0e7253a3b%40%3Cusers.tomcat.apache.org%3E
lists.apache.org / thread.html/rd0463f9a5cbc02a485404c4b990f0da452e5ac5c237808edba11c947%40%3Cusers.tomcat.apache.org%3E
lists.apache.org / thread.html/rf6d5d57b114678d8898005faef31e9fd6d7c981fcc4ccfc3bc272fc9%40%3Cdev.tomcat.apache.org%3E
lists.debian.org / debian-lts-announce/2021/03/msg00018.html
Mailing ListThird Party Advisory
security.gentoo.org / glsa/202208-34
Third Party Advisory
security.netapp.com / advisory/ntap-20210409-0002
Third Party Advisory
debian.org / security/2021/dsa-4891
Third Party Advisory
oracle.com / security-alerts/cpujan2022.html
PatchThird Party Advisory
oracle.com / /security-alerts/cpujul2021.html
PatchThird Party Advisory
oracle.com / security-alerts/cpuoct2021.html
PatchThird Party Advisory
openwall.com / lists/oss-security/2021/03/01/1
Mailing ListThird Party Advisory