CVE & CISA-KEV Catalog

CVE-2020-1935

MEDIUMEPSS 95th pctl
4.8
CVSS v3
NVD

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.

CWE-444

How to fix

Remediation Available
tomcat9Debian
Fixed in:9.0.31-1CVE-2020-1935
Fixed in:9.0.31-1CVE-2020-1935
Fixed in:9.0.31-1CVE-2020-1935
Fixed in:9.0.31-1CVE-2020-1935
libtomcat8-javaUbuntu
Fixed in:8.0.32-1ubuntu1.13USN-4448-1
tomcat8Ubuntu
Fixed in:8.0.32-1ubuntu1.13USN-4448-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredNone
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

Exploit Intelligence

9.39%probability of exploitation in 30 days
95thpercentile

High risk: more likely to be exploited than 95% of all known CVEs.

References

Vendor Advisory1
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.