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CVE-2020-1935In 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…
- 4.8MediumCVSS base score
- 9.4%Exploitation in 30 daysEPSS · top 4.5% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By apache
- 3 months later
· 3 months later
Published
- 7 years later
· 7 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium4.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N |
- EPSS (exploitation in 30 days)
- 9.4% · top 4.5% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.8.
Affected products
- affected Apache Tomcat 9.0.0.M1 to 9.0.30
- affected 8.5.0 to 8.5.50
- affected 7.0.0 to 7.0.99
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Mavenorg.apache.tomcat.embed:tomcat-embed-coreGHSA-qxf4-chvg-4r8r (opens in a new tab)
- Mavenorg.apache.tomcat:tomcatGHSA-qxf4-chvg-4r8r (opens in a new tab)
References
References19
- [tomcat-announce] 20200224 [SECURITY] CVE-2020-1935 HTTP Request Smuggling (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [debian-lts-announce] 20200304 [SECURITY] [DLA 2133-1] tomcat7 security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- openSUSE-SU-2020:0345 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- [tomee-commits] 20200320 [jira] [Created] (TOMEE-2790) TomEE plus(7.0.7) is affected by CVE-2020-1935 & CVE-2019-17569 vulnerabilities (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [tomee-commits] 20200323 [jira] [Commented] (TOMEE-2790) TomEE plus(7.0.7) is affected by CVE-2020-1935 & CVE-2019-17569 vulnerabilities (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- DSA-4673 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- DSA-4680 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- [debian-lts-announce] 20200528 [SECURITY] [DLA 2209-1] tomcat8 security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- https://www.oracle.com/security-alerts/cpujul2020.html (opens in a new tab)x_refsource_MISCx_transferred
- https://security.netapp.com/advisory/ntap-20200327-0005/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- [tomcat-users] 20200724 CVE-2020-1935 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [tomcat-users] 20200724 Re: CVE-2020-1935 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [tomcat-users] 20200724 RE: CVE-2020-1935 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [tomcat-users] 20200726 Re: CVE-2020-1935 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [tomcat-users] 20200727 RE: CVE-2020-1935 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- USN-4448-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- https://www.oracle.com/security-alerts/cpuoct2020.html (opens in a new tab)x_refsource_MISCx_transferred
- https://www.oracle.com/security-alerts/cpujan2021.html (opens in a new tab)x_refsource_MISCx_transferred
- [tomcat-dev] 20210428 [Bug 65272] Problems proccessing HTTP request without CR in last versions (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2020-0311 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-qxf4-chvg-4r8r (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2020-1935)Record last updated .