2021-33683 | SAP Web Dispatcher/Internet Communication Manager HTTP Header request smuggling

CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score
6.0 $0-$5k 0.33

A vulnerability was found in SAP Web Dispatcher and Internet Communication Manager 7.21 up to 7.83. It has been declared as critical. Affected by this vulnerability is an unknown part of the component HTTP Header Handler. The manipulation of the argument Transfer-Encoding with an unknown input leads to a privilege escalation vulnerability. The CWE definition for the vulnerability is CWE-444. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

SAP Web Dispatcher and Internet Communication Manager (ICM), versions – KRNL32NUC 7.21, 7.21EXT, 7.22, 7.22EXT, KRNL32UC 7.21, 7.21EXT, 7.22, 7.22EXT, KRNL64NUC 7.21, 7.21EXT, 7.22, 7.22EXT, 7.49, KRNL64UC 7.21, 7.21EXT, 7.22, 7.22EXT, 7.49, 7.53, 7.73, WEBDISP 7.53, 7.73, 7.77, 7.81, 7.82, 7.83, KERNEL 7.21, 7.22, 7.49, 7.53, 7.73, 7.77, 7.81, 7.82, 7.83, process invalid HTTP header. The incorrect handling of the invalid Transfer-Encoding header in a particular manner leads to a possibility of HTTP Request Smuggling attack. An attacker could exploit this vulnerability to bypass web application firewall protection, divert sensitive data such as customer requests, session credentials, etc.

The weakness was disclosed 07/14/2021. The advisory is shared at wiki.scn.sap.com. This vulnerability is known as CVE-2021-33683 since 05/28/2021. The exploitation appears to be easy. The attack can be launched remotely. A single authentication is necessary for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/18/2021).

Applying a patch is able to eliminate this problem.



VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

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Vector Complexity Authentication Confidentiality Integrity Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Class: Privilege escalation
CWE: CWE-444
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: wiki.scn.sap.com

05/28/2021 CVE assigned
07/14/2021 +47 days Advisory disclosed
07/14/2021 +0 days VulDB entry created
07/18/2021 +4 days VulDB last updateVendor: https://www.sap.com

Advisory: wiki.scn.sap.com
Status: Confirmed

CVE: CVE-2021-33683 (🔒)
scip Labs: https://www.scip.ch/en/?labs.20150716

Created: 07/14/2021 19:01
Updated: 07/18/2021 13:40
Changes: (1) source_cve_cna
Complete: 🔍

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