Apache Tomcat up to 8.5.66/9.0.46/10.0.6 HTTP Header Transfer-Encoding request smuggling

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.3$5k-$25k0.00

Summaryinfo

A vulnerability was found in Apache Tomcat up to 8.5.66/9.0.46/10.0.6. It has been declared as critical. This affects an unknown part of the component HTTP Header Handler. Such manipulation of the argument Transfer-Encoding leads to request smuggling. This vulnerability is listed as CVE-2021-33037. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Apache Tomcat up to 8.5.66/9.0.46/10.0.6 (Application Server Software) and classified as critical. Affected by this issue is some unknown processing of the component HTTP Header Handler. The manipulation of the argument Transfer-Encoding with an unknown input leads to a request smuggling vulnerability. Using CWE to declare the problem leads to CWE-444. The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination. Impacted is confidentiality, integrity, and availability.

The weakness was presented 07/12/2021. The advisory is shared for download at lists.apache.org. This vulnerability is handled as CVE-2021-33037. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 07/12/2021).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.3
VulDB Temp Score: 7.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Request smuggling
CWE: CWE-444
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

05/17/2021 🔍
07/12/2021 +56 days 🔍
07/12/2021 +0 days 🔍
07/15/2021 +3 days 🔍

Sourcesinfo

Vendor: apache.org

Advisory: lists.apache.org
Status: Confirmed

CVE: CVE-2021-33037 (🔍)
GCVE (CVE): GCVE-0-2021-33037
GCVE (VulDB): GCVE-100-178268

Entryinfo

Created: 07/12/2021 19:35
Updated: 07/15/2021 10:57
Changes: 07/12/2021 19:35 (38), 07/15/2021 10:57 (2)
Complete: 🔍
Cache ID: 216::103

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