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CVE-2020-1935 Apache Tomcat

Affected softwareApache Tomcat
Severity4.8 Medium CVSS 3.1 2 scores
Fixed in7.0.100, 8.5.51, 9.0.31
WeaknessCWE-444
Published24 Feb 2020
Updated8 Oct 2026

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.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. Published 6 years ago.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 9.4% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.

CVSS

4.8 MEDIUM v3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 4.8 MEDIUM CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N NVD Primary published
CVSS 2.0 5.8 none AV:N/AC:M/Au:N/C:P/I:P/A:N NVD Primary

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update April 2025 ↗ CPU 2025-Q2 Oracle Autonomous Health Framework / Trace File Analyzer (Apache Tomcat) (23.8.0-23.11.0, 24.1.0-24.11.0, 25.1.0, 25.2.0)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Autonomous Health Framework Trace File Analyzer (Apache Tomcat) 23.8.0-23.11.0, 24.1.0-24.11.0, 25.1.0, 25.2.0 25.1.0 · 25.2.0

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.apache.tomcat.embed:tomcat-embed-core 0 7.0.100 unbounded
org.apache.tomcat.embed:tomcat-embed-core 8.0.0 8.5.51 unbounded
org.apache.tomcat.embed:tomcat-embed-core 9.0.0 9.0.31 unbounded
org.apache.tomcat:tomcat 0 7.0.100 unbounded
org.apache.tomcat:tomcat 8.0.0 8.5.51 unbounded
org.apache.tomcat:tomcat 9.0.0 9.0.31 unbounded

Products and versions

22 products, 66 version entries
SourceVendorProductSchemeAffected versions
nvd apache tomcat generic ≥ 7.0.0 and ≤ 7.0.99 · ≥ 8.5.0 and ≤ 8.5.50 · 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 · ≥ 9.0.0 and ≤ 9.0.30
nvd canonical ubuntu linux generic 16.04
nvd debian debian linux generic 8.0 · 9.0 · 10.0
nvd netapp data availability services generic any version
nvd netapp oncommand system manager generic ≥ 3.0.0 and ≤ 3.1.3
nvd opensuse leap generic 15.1
nvd oracle agile engineering data management generic 6.2.1.0
nvd oracle agile product lifecycle management generic 9.3.3 · 9.3.5 · 9.3.6
nvd oracle communications element manager generic 8.1.1 · 8.2.0 · 8.2.1
nvd oracle communications instant messaging server generic 10.0.1.4.0
nvd oracle health sciences empirica inspections generic 1.0.1.2
nvd oracle health sciences empirica signal generic 7.3.3
nvd oracle hospitality guest access generic 4.2.0 · 4.2.1
nvd oracle hyperion infrastructure technology generic 11.1.2.4
nvd oracle instantis enterprisetrack generic ≥ 17.1 and ≤ 17.3
nvd oracle mysql enterprise monitor generic ≥ 4.0.0 and ≤ 4.0.12 · ≥ 8.0.0 and ≤ 8.0.20
nvd oracle retail order broker generic 15.0
nvd oracle siebel ui framework generic ≤ 20.5
nvd oracle transportation management generic 6.3.7
nvd oracle workload manager generic 12.2.0.1 · 18c · 19c
osv org.apache.tomcat tomcat generic < 7.0.100 · ≥ 8.0.0 and < 8.5.51 · ≥ 9.0.0 and < 9.0.31
osv org.apache.tomcat.embed tomcat-embed-core generic < 7.0.100 · ≥ 8.0.0 and < 8.5.51 · ≥ 9.0.0 and < 9.0.31

References

URLTags
https://www.oracle.com/security-alerts/cpuoct2020.html WEB
https://www.oracle.com/security-alerts/cpujul2020.html WEB
https://www.oracle.com/security-alerts/cpujan2021.html WEB
https://www.debian.org/security/2020/dsa-4680 WEB
https://www.debian.org/security/2020/dsa-4673 WEB
https://usn.ubuntu.com/4448-1 WEB
https://security.netapp.com/advisory/ntap-20200327-0005 WEB
https://lists.debian.org/debian-lts-announce/2020/05/msg00026.html WEB
https://lists.debian.org/debian-lts-announce/2020/03/msg00006.html WEB
https://lists.apache.org/thread.html/rd547be0c9d821b4b1000a694b8e58ef9f5e2d66db03a31dfe77c4b18@%3Cusers.tomcat.apache.org%3E WEB

Timeline

Published2020-02-24By the CVE Program.
NVD record modified2026-10-08NVD's own last-modified date for this record.