HOME VULNERABILITIESCVE-2020-1935

MEDIUM

CVE-2020-1935

CWE-444Published: February 24, 2020· Updated: Jun 17, 2026

4.8

CVSS v3.1

Official 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.

Technical Analysis

CVE-2020-1935 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected Vendors & Products

Apache1 product(s)

tomcat

Canonical1 product(s)

ubuntu linux

Debian1 product(s)

debian linux

netapp2 product(s)

data availability servicesoncommand system manager

openSUSE1 product(s)

leap

Oracle14 product(s)

agile engineering data managementagile product lifecycle managementcommunications element managercommunications instant messaging serverhealth sciences empirica inspectionshealth sciences empirica signalhospitality guest accesshyperion infrastructure technologyinstantis enterprisetrackmysql enterprise monitorretail order brokersiebel ui framework+2

Source: NVD CPE · 30 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2020-03/msg00025.html

ADVISORYhttps://lists.apache.org/thread.html/r127f76181aceffea2bd4711b03c595d0f115f63e020348fe925a916c%40%3Cannounce.tomcat.apache.org%3E

ADVISORYhttps://lists.debian.org/debian-lts-announce/2020/03/msg00006.html

ADVISORYhttps://lists.debian.org/debian-lts-announce/2020/05/msg00026.html

ADVISORYhttps://security.netapp.com/advisory/ntap-20200327-0005/

ADVISORYhttps://usn.ubuntu.com/4448-1/

ADVISORYhttps://www.debian.org/security/2020/dsa-4673

ADVISORYhttps://www.debian.org/security/2020/dsa-4680

ADVISORYhttps://www.oracle.com/security-alerts/cpujan2021.html

ADVISORYhttps://www.oracle.com/security-alerts/cpujul2020.html

ADVISORYhttps://www.oracle.com/security-alerts/cpuoct2020.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2020-03/msg00025.html

ADVISORYhttps://lists.apache.org/thread.html/r127f76181aceffea2bd4711b03c595d0f115f63e020348fe925a916c%40%3Cannounce.tomcat.apache.org%3E

ADVISORYhttps://lists.debian.org/debian-lts-announce/2020/03/msg00006.html

ADVISORYhttps://lists.debian.org/debian-lts-announce/2020/05/msg00026.html

ADVISORYhttps://security.netapp.com/advisory/ntap-20200327-0005/

ADVISORYhttps://usn.ubuntu.com/4448-1/

ADVISORYhttps://www.debian.org/security/2020/dsa-4673

ADVISORYhttps://www.debian.org/security/2020/dsa-4680

ADVISORYhttps://www.oracle.com/security-alerts/cpujan2021.html

ADVISORYhttps://www.oracle.com/security-alerts/cpujul2020.html

ADVISORYhttps://www.oracle.com/security-alerts/cpuoct2020.html

All References (38)

→

http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00025.htmlBroken Link · Mailing List · Third Party Advisory

→

https://lists.apache.org/thread.html/r127f76181aceffea2bd4711b03c595d0f115f63e020348fe925a916c%40%3Cannounce.tomcat.apache.org%3EMailing List · Vendor Advisory

→

https://lists.apache.org/thread.html/r441c1f30a252bf14b07396286f6abd8089ce4240e91323211f1a2d75%40%3Cusers.tomcat.apache.org%3E

→

https://lists.apache.org/thread.html/r660cd379afe346f10d72c0eaa8459ccc95d83aff181671b7e9076919%40%3Cusers.tomcat.apache.org%3E

→

https://lists.apache.org/thread.html/r7bc994c965a34876bd94d5ff15b4e1e30b6220a15eb9b47c81915b78%40%3Ccommits.tomee.apache.org%3E

→

https://lists.apache.org/thread.html/r80e9c8417c77d52c62809168b96912bda70ddf7748f19f8210f745b1%40%3Cusers.tomcat.apache.org%3E

→

https://lists.apache.org/thread.html/r9ce7918faf347e7aac32be930bf26c233b0b140fe37af0bb294158b6%40%3Cdev.tomcat.apache.org%3E

→

https://lists.apache.org/thread.html/ra5dee390ad2d60307b8362505c059cd6a726de4d146d63dfce1e05e7%40%3Cusers.tomcat.apache.org%3E

→

https://lists.apache.org/thread.html/rc31cbabb46cdc58bbdd8519a8f64b6236b2635a3922bbeba0f0e3743%40%3Ccommits.tomee.apache.org%3E

→

https://lists.apache.org/thread.html/rd547be0c9d821b4b1000a694b8e58ef9f5e2d66db03a31dfe77c4b18%40%3Cusers.tomcat.apache.org%3E

→

https://lists.debian.org/debian-lts-announce/2020/03/msg00006.htmlMailing List · Third Party Advisory

→

https://lists.debian.org/debian-lts-announce/2020/05/msg00026.htmlMailing List · Third Party Advisory

→

https://security.netapp.com/advisory/ntap-20200327-0005/Third Party Advisory

→

https://usn.ubuntu.com/4448-1/Third Party Advisory

→

https://www.debian.org/security/2020/dsa-4673Third Party Advisory

Quick Facts

CVE IDCVE-2020-1935

CVSS Score4.8 / 10

SeverityMEDIUM

WeaknessCWE-444

CISA KEVNo

Affected6 vendor(s)

PublishedFeb 24, 2020

Related CVEs (CWE-444)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2020-1935 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.

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