5.8

CVE-2020-1935: apache apache tomcat

Modified
AliasesRHSA-2020:5020UBUNTU-CVE-2020-1935DEBIAN-CVE-2020-1935
Published 24-02-2020Last modified 08-10-2026

Vulnerability summary

CVE-2020-1935 is a medium (CVSS 5.8) vulnerability in apache apache tomcat. EPSS estimates a 9.39% chance of exploitation in the next 30 days, higher than 95.4% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 4.8, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.8/10
010
Medium · v2.0 (NVD)
EPSS score
9.39%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 18 · Related 10
DLA-2133-1DLA-2209-1DSA-4673-1DSA-4680-1MGASA-2020-0138OPENSUSE-SU-2020:0345-1

Timeline

  1. 24-02-2020
    PublishedVulnerability first disclosed.
  2. 08-10-2026
    Last modifiedVulnerability information updated.

Description

In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.

CVSS metrics

6 scores · 5 sources · 2 versions

EPSS trend

Probability

9.39%

Chance of exploitation in the next 30 days

Percentile

95%

Versus all other CVEs

30-day change

No change 0.00 pp

From 9.39% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Oracle14 products
Redhat10 products
  • tomcat< 0:7.0.76-16.el7_9
  • tomcat-admin-webapps< 0:7.0.76-16.el7_9
  • tomcat-docs-webapp< 0:7.0.76-16.el7_9
  • tomcat-el-2.2-api< 0:7.0.76-16.el7_9
  • tomcat-javadoc< 0:7.0.76-16.el7_9
Ubuntu3 products
  • tomcat7All versions (No fix recorded)
  • tomcat8< 8.0.32-1ubuntu1.13 | All versions (No fix recorded)
  • tomcat9All versions (No fix recorded)
Apache2 products
  • apache tomcatApache Tomcat 9.0.0.M1 to 9.0.30 | 8.5.0 to 8.5.50 | 7.0.0 to 7.0.99
  • tomcat≥ 7.0.0, ≤ 7.0.99 | ≥ 8.5.0, ≤ 8.5.50 | ≥ 9.0.0, ≤ 9.0.30 | 9.0.0 | 9.0.0:milestone1 | 9.0.0:milestone10 | 9.0.0:milestone11 | 9.0.0:milestone12 | 9.0.0:milestone13 | 9.0.0:milestone14 | 9.0.0:milestone15 | 9.0.0:milestone16 | 9.0.0:milestone17 | 9.0.0:milestone18 | 9.0.0:milestone19 | 9.0.0:milestone2 | 9.0.0:milestone20 | 9.0.0:milestone21 | 9.0.0:milestone22 | 9.0.0:milestone23 | 9.0.0:milestone24 | 9.0.0:milestone25 | 9.0.0:milestone26 | 9.0.0:milestone27 | 9.0.0:milestone3 | 9.0.0:milestone4 | 9.0.0:milestone5 | 9.0.0:milestone6 | 9.0.0:milestone7 | 9.0.0:milestone8 | 9.0.0:milestone9
Debian2 products
Netapp2 products
Canonical1 product
Opensuse1 product
Org.apache.tomcat1 product
  • tomcat< 7.0.100 | ≥ 8.0.0, < 8.5.51 | ≥ 9.0.0, < 9.0.31
Org.apache.tomcat.embed1 product
  • tomcat-embed-core< 7.0.100 | ≥ 8.0.0, < 8.5.51 | ≥ 9.0.0, < 9.0.31

10 vendors · 37 products

References

42 links
Show all 42 references