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CVE-2020-1935

Quick assessment

Affected

Apache Apache Tomcat

Exploitation

High exploitation probability; assess promptly

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Tomcat是美国阿帕奇（Apache）软件基金会的一款轻量级Web应用服务器。该程序实现了对Servlet和JavaServer Page（JSP）的支持。 Apache Tomcat 9.0.0.M1版本至9.0.30版本、8.5.0版本至8.5.50版本和7.0.0版本至7.0.99版本中存在环境问题漏洞。该漏洞源于网络系统或产品的环境因素不合理。

AI Predicted 5.3 Difficulty: Moderate EPSS 9.39% · P95 Updated Feb 24, 2026

Possible ATT&CK Techniques 1 AI

T1102 · Web Service

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I. Basic Information for CVE-2020-1935

Vulnerability Information

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Vulnerability Title

N/A

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

N/A

Source: CVE Program / CVE List V5

Vulnerability Type

N/A

Source: CVE Program / CVE List V5

Vulnerability Title

Apache Tomcat 环境问题漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Apache	Apache Tomcat	Apache Tomcat 9.0.0.M1 to 9.0.30	-

II. Public POCs for CVE-2020-1935

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2020-1935

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Vendor Advisories for CVE-2020-1935 (7)

https://security.netapp.com/advisory/ntap-20200327-0005/ x_refsource_CONFIRM
https://www.oracle.com/security-alerts/cpujan2021.html x_refsource_MISC
https://www.oracle.com/security-alerts/cpujul2020.html x_refsource_MISC
https://www.oracle.com/security-alerts/cpuoct2020.html x_refsource_MISC
https://www.debian.org/security/2020/dsa-4673 vendor-advisory x_refsource_DEBIAN
https://www.debian.org/security/2020/dsa-4680 vendor-advisory x_refsource_DEBIAN
https://usn.ubuntu.com/4448-1/ vendor-advisory x_refsource_UBUNTU

Mailing List Discussions for CVE-2020-1935 (12)

http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00025.html vendor-advisory x_refsource_SUSE
https://lists.apache.org/thread.html/r441c1f30a252bf14b07396286f6abd8089ce4240e91323211f1a2d75%40%3Cusers.tomcat.apache.org%3E mailing-list x_refsource_MLIST
https://lists.apache.org/thread.html/r80e9c8417c77d52c62809168b96912bda70ddf7748f19f8210f745b1%40%3Cusers.tomcat.apache.org%3E mailing-list x_refsource_MLIST
https://lists.apache.org/thread.html/r660cd379afe346f10d72c0eaa8459ccc95d83aff181671b7e9076919%40%3Cusers.tomcat.apache.org%3E mailing-list x_refsource_MLIST
https://lists.apache.org/thread.html/rd547be0c9d821b4b1000a694b8e58ef9f5e2d66db03a31dfe77c4b18%40%3Cusers.tomcat.apache.org%3E mailing-list x_refsource_MLIST
https://lists.apache.org/thread.html/ra5dee390ad2d60307b8362505c059cd6a726de4d146d63dfce1e05e7%40%3Cusers.tomcat.apache.org%3E mailing-list x_refsource_MLIST
https://lists.apache.org/thread.html/r127f76181aceffea2bd4711b03c595d0f115f63e020348fe925a916c%40%3Cannounce.tomcat.apache.org%3E mailing-list x_refsource_MLIST
https://lists.debian.org/debian-lts-announce/2020/05/msg00026.html mailing-list x_refsource_MLIST
https://lists.debian.org/debian-lts-announce/2020/03/msg00006.html mailing-list x_refsource_MLIST
https://lists.apache.org/thread.html/r9ce7918faf347e7aac32be930bf26c233b0b140fe37af0bb294158b6%40%3Cdev.tomcat.apache.org%3E mailing-list x_refsource_MLIST
https://lists.apache.org/thread.html/rc31cbabb46cdc58bbdd8519a8f64b6236b2635a3922bbeba0f0e3743%40%3Ccommits.tomee.apache.org%3E mailing-list x_refsource_MLIST
https://lists.apache.org/thread.html/r7bc994c965a34876bd94d5ff15b4e1e30b6220a15eb9b47c81915b78%40%3Ccommits.tomee.apache.org%3E mailing-list x_refsource_MLIST

https://www.cve.org/CVERecord?id=CVE-2020-1935

Same Patch Batch · Apache · 2020-02-24 · 4 CVEs total

CVE-2020-1938		Apache Tomcat 安全漏洞
CVE-2019-17569		Apache Tomcat 环境问题漏洞
CVE-2020-1937		Apache Kylin SQL注入漏洞

IV. Related Vulnerabilities

Same product: Apache Tomcat

Same vendor: Apache

V. Comments for CVE-2020-1935

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2020-1935

Quick assessment

Possible ATT&CK Techniques 1 AI

I. Basic Information for CVE-2020-1935

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2020-1935

III. Intelligence Information for CVE-2020-1935

Vendor Advisories for CVE-2020-1935 (7)

Mailing List Discussions for CVE-2020-1935 (12)

Same Patch Batch · Apache · 2020-02-24 · 4 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2020-1935

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