CVE catalog
CVE-2020-1935
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 val
- Severity
- Medium · CVSS 4.8
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 9.39% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | tomcat9 | sid | 9.0.122-1 | fixed |
| Debian | tomcat9 | forky | 9.0.122-1 | fixed |
| Debian | tomcat9 | trixie | 9.0.95-1 | fixed |
| Debian | tomcat9 | bookworm | 9.0.70-2 | fixed |
| Cpe | tomcat | Not reported | Not reported | unknown |
| Cpe | tomcat | Not reported | Not reported | unknown |
| Cpe | tomcat | Not reported | Not reported | unknown |
| Cpe | tomcat | Not reported | Not reported | unknown |
| Cpe | tomcat | Not reported | Not reported | unknown |
| Cpe | tomcat | Not reported | Not reported | unknown |
| Cpe | tomcat | Not reported | Not reported | unknown |
| Cpe | tomcat | Not reported | Not reported | unknown |
| Cpe | tomcat | Not reported | Not reported | unknown |
| Cpe | tomcat | Not reported | Not reported | unknown |
| Cpe | tomcat | Not reported | Not reported | unknown |
| Cpe | tomcat | Not reported | Not reported | unknown |
| Cpe | tomcat | Not reported | Not reported | unknown |
| Cpe | tomcat | Not reported | Not reported | unknown |
| Cpe | tomcat | Not reported | Not reported | unknown |
| Cpe | tomcat | Not reported | Not reported | unknown |
| Cpe | tomcat | Not reported | Not reported | unknown |
| Cpe | tomcat | Not reported | Not reported | unknown |
| Cpe | tomcat | Not reported | Not reported | unknown |
| Cpe | tomcat | Not reported | Not reported | unknown |
| Ubuntu | tomcat7 | pro | 7.0.64-1 | vulnerable |
| Ubuntu | tomcat7 | pro | 7.0.68-1 | vulnerable |
| Ubuntu | tomcat7 | pro | 7.0.68-1ubuntu0.1 | vulnerable |
| Ubuntu | tomcat7 | pro | 7.0.68-1ubuntu0.3 | vulnerable |
| Ubuntu | tomcat7 | pro | 7.0.68-1ubuntu0.4 | vulnerable |
| Ubuntu | tomcat7 | pro | 7.0.68-1ubuntu0.4+esm1 | vulnerable |
| Ubuntu | tomcat7 | pro | 7.0.68-1ubuntu0.4+esm2 | vulnerable |
| Ubuntu | tomcat7 | pro | 7.0.68-1ubuntu0.4+esm3 | vulnerable |
| Ubuntu | tomcat7 | pro | 7.0.68-1ubuntu0.4+esm4 | vulnerable |
| Ubuntu | tomcat8 | 16.04 | 8.0.26-1 | vulnerable |
| Ubuntu | tomcat8 | 16.04 | 8.0.28-1 | vulnerable |
| Ubuntu | tomcat8 | 16.04 | 8.0.30-1 | vulnerable |
| Ubuntu | tomcat8 | 16.04 | 8.0.32-1 | vulnerable |
| Ubuntu | tomcat8 | 16.04 | 8.0.32-1ubuntu1 | vulnerable |
| Ubuntu | tomcat8 | 16.04 | 8.0.32-1ubuntu1.1 | vulnerable |
| Ubuntu | tomcat8 | 16.04 | 8.0.32-1ubuntu1.2 | vulnerable |
| Ubuntu | tomcat8 | 16.04 | 8.0.32-1ubuntu1.3 | vulnerable |
| Ubuntu | tomcat8 | 16.04 | 8.0.32-1ubuntu1.4 | vulnerable |
| Ubuntu | tomcat8 | 16.04 | 8.0.32-1ubuntu1.5 | vulnerable |
| Ubuntu | tomcat8 | 16.04 | 8.0.32-1ubuntu1.6 | vulnerable |
| Ubuntu | tomcat8 | 16.04 | 8.0.32-1ubuntu1.7 | vulnerable |
| Ubuntu | tomcat8 | 16.04 | 8.0.32-1ubuntu1.8 | vulnerable |
| Ubuntu | tomcat8 | 16.04 | 8.0.32-1ubuntu1.9 | vulnerable |
| Ubuntu | tomcat8 | 16.04 | 8.0.32-1ubuntu1.10 | vulnerable |
| Ubuntu | tomcat8 | 16.04 | 8.0.32-1ubuntu1.11 | vulnerable |
| Ubuntu | tomcat8 | 16.04 | 8.0.32-1ubuntu1.13 | fixed |
| Ubuntu | tomcat8 | pro | 8.5.21-1ubuntu1 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.29-1 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.30-1 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.30-1ubuntu1 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.30-1ubuntu1.2 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.30-1ubuntu1.3 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.30-1ubuntu1.4 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.39-1ubuntu1~18.04.1 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.39-1ubuntu1~18.04.2 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.39-1ubuntu1~18.04.3 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.39-1ubuntu1~18.04.3+esm1 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.39-1ubuntu1~18.04.3+esm2 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.39-1ubuntu1~18.04.3+esm3 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.39-1ubuntu1~18.04.3+esm4 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.39-1ubuntu1~18.04.3+esm5 | vulnerable |
| Ubuntu | tomcat8 | pro | 8.5.39-1ubuntu1~18.04.3+esm6 | vulnerable |
| Ubuntu | tomcat9 | pro | 9.0.16-3~18.04.1 | vulnerable |
| Ubuntu | tomcat9 | pro | 9.0.16-3ubuntu0.18.04.1 | vulnerable |
| Ubuntu | tomcat9 | pro | 9.0.16-3ubuntu0.18.04.2 | vulnerable |
| Ubuntu | tomcat9 | pro | 9.0.16-3ubuntu0.18.04.2+esm1 | vulnerable |
| Ubuntu | tomcat9 | pro | 9.0.16-3ubuntu0.18.04.2+esm2 | vulnerable |
| Ubuntu | tomcat9 | pro | 9.0.16-3ubuntu0.18.04.2+esm3 | vulnerable |
| Ubuntu | tomcat9 | pro | 9.0.16-3ubuntu0.18.04.2+esm4 | vulnerable |
| Ubuntu | tomcat9 | pro | 9.0.16-3ubuntu0.18.04.2+esm5 | vulnerable |
| Ubuntu | tomcat9 | pro | 9.0.16-3ubuntu0.18.04.2+esm6 | vulnerable |
| Ubuntu | tomcat9 | pro | 9.0.16-3ubuntu0.18.04.2+esm7 | vulnerable |
| Ubuntu | tomcat9 | pro | 9.0.16-3ubuntu0.18.04.2+esm8 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | tomcat9 | source | sid | 9.0.31-1 | not yet assigned | Not reported | Not reported |
| Debian | tomcat9 | source | forky | 9.0.31-1 | not yet assigned | Not reported | Not reported |
| Debian | tomcat9 | source | trixie | 9.0.31-1 | not yet assigned | Not reported | Not reported |
| Debian | tomcat9 | source | bookworm | 9.0.31-1 | not yet assigned | Not reported | Not reported |
| Ubuntu | tomcat8 | deb | 16.04 | 8.0.32-1ubuntu1.13 | Not reported | UBUNTU-CVE-2020-1935 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libtomcat9-java]Fixed
Source package: [tomcat9]
Details (2)
9.0.70-2· all · bookwormFixed · Fixed:
9.0.31-1nvd · tomcat9 · debian · bookworm; nvd · tomcat9 · debian · 12
9.0.70-2· all · bookwormFixed · Fixed:
9.0.31-1nvd · tomcat9 · debian · bookworm; nvd · tomcat9 · debian · 12
[Debian 13 (Trixie)]
- [libtomcat9-java]Fixed
Source package: [tomcat9]
Details (2)
9.0.95-1· all · trixieFixed · Fixed:
9.0.31-1nvd · tomcat9 · debian · 13
9.0.95-1· all · trixieFixed · Fixed:
9.0.31-1nvd · tomcat9 · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2020_5020.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2020-1935]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2020-1935]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2020-1935]
- [https://security-tracker.debian.org/tracker/CVE-2020-1935]
- [https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-1935.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2020/wid-sec-w-2023-2130.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]