CVE-2021-33683

MEDIUM

4.3

CVSS Score

Published: July 14, 2021 at 11:04 AM UTC

Updated: June 17, 2026 at 03:55 AM UTC

2 products affected across 1 vendorWeb DispatcherInternet Communication Manager

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Severity

MEDIUM4.3

Exploit prediction

EPSS 0.5%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Internet Communication Manager · SAP

95%

v < 7.21EXTv < 7.22v < 7.22EXTv < 7.49v < 7.53v < 7.73v < 7.77v < 7.81v < 7.82v < 7.837.21ext 7.22 7.22ext 7.49 7.53 7.73 7.77 7.81 7.82< KERNEL 7.21< KRNL32NUC 7.21< KRNL32UC 7.21< KRNL64NUC 7.21< KRNL64UC 7.21< WEBDISP 7.53kernel_7.21 krnl32nuc_7.21 krnl32uc_7.21 krnl64nuc_7.21 krnl64uc_7.21 webdisp_7.53

Affected range stops below 7.21EXT, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.22, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.22EXT, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.49, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.53, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.73, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.77, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.81, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.82, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.83, so it looks safe — our inference, not a vendor statement

Web Dispatcher · SAP

95%

v < 7.21EXTv < 7.22v < 7.22EXTv < 7.49v < 7.53v < 7.73v < 7.77v < 7.81v < 7.82v < 7.837.21ext 7.22 7.22ext 7.49 7.53 7.73 7.77 7.81 7.82 7.8_kernel_7.21 < KERNEL 7.21< KRNL32NUC 7.21< KRNL32UC 7.21< KRNL64NUC 7.21< KRNL64UC 7.21< WEBDISP 7.53krnl32nuc_7.21 krnl32uc_7.21 krnl64nuc_7.21 krnl64uc_7.21 webdisp_7.53