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CVE-2020-1935

22
FAUCET Score

CVE-2020-1935 is a medium-severity HTTP Request Smuggling vulnerability affecting Apache Tomcat versions 7.0.0-7.0.99, 8.5.0-8.5.50, and 9.0.0.M1-9.0.30, as well as products from Canonical, Debian, NetApp, OpenSUSE, and Oracle. It arises from incorrect HTTP header parsing, potentially allowing a reverse proxy to misinterpret invalid Transfer-Encoding headers. The attack requires a specific, unlikely reverse proxy configuration and has a low impact on confidentiality and integrity. There is no evidence of active exploitation, public exploit code, or significant community discussion, indicating a low immediate threat.

Impacted Technologies

VendorProductVersion(s)CPE
>= 7.0.0, <= 7.0.99CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
>= 8.5.0, <= 8.5.50CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
>= 9.0.0, <= 9.0.30CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
9.0.0CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:9.0.0:-:*:*:*:*:*:*
9.0.0CPE matchmatch criteria
cpe:2.3:a:apache:tomcat:9.0.0:milestone1:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.8MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
2.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
9.39%
Probability of exploitation in next 30 days
EPSS Percentile
94.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0939 is in the 94th percentile among its peer group of 19,953 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (26)

mavenpatch availablevia ghsa
Product: org.apache.tomcat.embed:tomcat-embed-coreFixed in: 7.0.100
mavenpatch availablevia ghsa
Product: org.apache.tomcat.embed:tomcat-embed-coreFixed in: 8.5.51
mavenpatch availablevia ghsa
Product: org.apache.tomcat.embed:tomcat-embed-coreFixed in: 9.0.31
mavenpatch availablevia ghsa
Product: org.apache.tomcat:tomcatFixed in: 7.0.100
mavenpatch availablevia ghsa
Product: org.apache.tomcat:tomcatFixed in: 8.5.51
mavenpatch availablevia ghsa
Product: org.apache.tomcat:tomcatFixed in: 9.0.31
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: tomcat-0:7.0.76-16.el7_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.6 Extended Update SupportFixed in: tomcat-0:7.0.76-11.el7_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.7 Extended Update SupportFixed in: tomcat-0:7.0.76-12.el7_7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: pki-core:10.6-8030020200911215836.5ff1562f
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: pki-deps:10.6-8030020200527165326.30b713e6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Fuse 7.9Fixed in: tomcat
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 3.1Fixed in: tomcat
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 3 for RHEL 6Fixed in: tomcat7-0:7.0.70-41.ep7.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 3 for RHEL 6Fixed in: tomcat8-0:8.0.36-45.ep7.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 3 for RHEL 7Fixed in: tomcat7-0:7.0.70-41.ep7.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 3 for RHEL 7Fixed in: tomcat8-0:8.0.36-45.ep7.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 5.3 on RHEL 6Fixed in: jws5-tomcat-0:9.0.30-3.redhat_4.1.el6jws
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 5.3 on RHEL 6Fixed in: jws5-tomcat-native-0:1.2.23-4.redhat_4.el6jws
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 5.3 on RHEL 7Fixed in: jws5-tomcat-0:9.0.30-3.redhat_4.1.el7jws
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 5.3 on RHEL 7Fixed in: jws5-tomcat-native-0:1.2.23-4.redhat_4.el7jws
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 5.3 on RHEL 8Fixed in: jws5-tomcat-0:9.0.30-3.redhat_4.1.el8jws
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 5.3 on RHEL 8Fixed in: jws5-tomcat-native-0:1.2.23-4.redhat_4.el8jws
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server (JWS) 5.3Fixed in: tomcat
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Runtimes Spring Boot 2.1.13Fixed in: tomcat
View patch
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 13 (Queens)Fixed in: opendaylight

Vendor Advisories (2)

mavenGHSA-qxf4-chvg-4r8rmedium

Potential HTTP request smuggling in Apache Tomcat

Feb 28, 2020
redhatCVE-2020-1935Low

tomcat: Mishandling of Transfer-Encoding header allows for HTTP request smuggling

Feb 24, 2020

References

lists.opensuse.org / opensuse-security-announce/2020-03/msg00025.html
Broken LinkMailing ListThird Party Advisory
lists.apache.org / thread.html/r127f76181aceffea2bd4711b03c595d0f115f63e020348fe925a916c%40%3Cannounce.tomcat.apache.org%3E
Mailing ListVendor Advisory
lists.apache.org / thread.html/r441c1f30a252bf14b07396286f6abd8089ce4240e91323211f1a2d75%40%3Cusers.tomcat.apache.org%3E
lists.apache.org / thread.html/r660cd379afe346f10d72c0eaa8459ccc95d83aff181671b7e9076919%40%3Cusers.tomcat.apache.org%3E
lists.apache.org / thread.html/r7bc994c965a34876bd94d5ff15b4e1e30b6220a15eb9b47c81915b78%40%3Ccommits.tomee.apache.org%3E
lists.apache.org / thread.html/r80e9c8417c77d52c62809168b96912bda70ddf7748f19f8210f745b1%40%3Cusers.tomcat.apache.org%3E
lists.apache.org / thread.html/r9ce7918faf347e7aac32be930bf26c233b0b140fe37af0bb294158b6%40%3Cdev.tomcat.apache.org%3E
lists.apache.org / thread.html/ra5dee390ad2d60307b8362505c059cd6a726de4d146d63dfce1e05e7%40%3Cusers.tomcat.apache.org%3E
lists.apache.org / thread.html/rc31cbabb46cdc58bbdd8519a8f64b6236b2635a3922bbeba0f0e3743%40%3Ccommits.tomee.apache.org%3E
lists.apache.org / thread.html/rd547be0c9d821b4b1000a694b8e58ef9f5e2d66db03a31dfe77c4b18%40%3Cusers.tomcat.apache.org%3E
lists.debian.org / debian-lts-announce/2020/03/msg00006.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2020/05/msg00026.html
Mailing ListThird Party Advisory
security.netapp.com / advisory/ntap-20200327-0005
Third Party Advisory
usn.ubuntu.com / 4448-1
Third Party Advisory
debian.org / security/2020/dsa-4673
Third Party Advisory
debian.org / security/2020/dsa-4680
Third Party Advisory
oracle.com / security-alerts/cpujan2021.html
Third Party Advisory
oracle.com / security-alerts/cpujul2020.html
Third Party Advisory
oracle.com / security-alerts/cpuoct2020.html
Third Party Advisory