What is the CVSS score of CVE-2021-33037?

CVE-2021-33037 has a CVSS 3.1 base score of 5.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N. EPSS exploitation probability: 75.4%.

Is there a patch available for CVE-2021-33037?

Yes, a patch is available for CVE-2021-33037. Update the affected software to the latest version immediately.

Tomcat CVE-2021-33037

MEDIUM

HTTP Request/Response Smuggling (CWE-444)

2021-07-12 security@apache.org

Tomcat Request Smuggling Apache Information Disclosure Tomee Debian Linux Agile Plm Communications Cloud Native Core Policy Communications Cloud Native Core Service Communication Proxy Communications Diameter Signaling Router Communications Instant Messaging Server Communications Policy Management Communications Pricing Design Center Communications Session Report Manager Communications Session Route Manager Graph Server And Client Healthcare Translational Research Hospitality Cruise Shipboard Property Management System Instantis Enterprisetrack Managed File Transfer Mysql Enterprise Monitor Sd Wan Edge Secure Global Desktop Utilities Testing Accelerator Epolicy Orchestrator

5.3

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.3 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Lifecycle Timeline

CVE Published

Jul 12, 2021 - 15:15 nvd

MEDIUM 5.3

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

1 maven packages depend on org.apache.tomcat:tomcat (1 direct, 0 indirect)

Ecosystem-wide dependent count for version 10.0.0-M1.

DescriptionNVD

Apache Tomcat 10.0.0-M1 to 10.0.6, 9.0.0.M1 to 9.0.46 and 8.5.0 to 8.5.66 did not correctly parse the HTTP transfer-encoding request header in some circumstances leading to the possibility to request smuggling when used with a reverse proxy. Specifically: - Tomcat incorrectly ignored the transfer encoding header if the client declared it would only accept an HTTP/1.0 response; - Tomcat honoured the identify encoding; and - Tomcat did not ensure that, if present, the chunked encoding was the final encoding.

AnalysisAI

Apache Tomcat 10.0.0-M1 to 10.0.6, 9.0.0.M1 to 9.0.46 and 8.5.0 to 8.5.66 did not correctly parse the HTTP transfer-encoding request header in some circumstances leading to the possibility to request. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This HTTP Request/Response Smuggling vulnerability could allow attackers to manipulate HTTP request interpretation between frontend and backend servers.

Technical ContextAI

This vulnerability is classified as HTTP Request/Response Smuggling (CWE-444), which allows attackers to manipulate HTTP request interpretation between frontend and backend servers. Apache Tomcat 10.0.0-M1 to 10.0.6, 9.0.0.M1 to 9.0.46 and 8.5.0 to 8.5.66 did not correctly parse the HTTP transfer-encoding request header in some circumstances leading to the possibility to request smuggling when used with a reverse proxy. Specifically: - Tomcat incorrectly ignored the transfer encoding header if the client declared it would only accept an HTTP/1.0 response; - Tomcat honoured the identify encoding; and - Tomcat did not ensure that, if present, the chunked encoding was the final encoding. Affected products include: Apache Tomcat, Apache Tomee, Debian Debian Linux, Oracle Agile Plm, Oracle Communications Cloud Native Core Policy.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Enforce strict HTTP parsing, normalize requests at proxy layer, use HTTP/2 end-to-end, reject ambiguous headers.