CVE-2021-33684 Memory corruption in SAP NetWeaver AS ABAP and ABAP Platform

Medium 5.3 Published 14 Jul 2021 Updated 3 Aug 2024

An attacker can crash a work process by sending overlong RFC requests, causing a temporary denial of service in SAP NetWeaver.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-33684?

CVE-2021-33684 is a medium-severity memory corruption vulnerability in Sap Netweaver Application Server Abap, published on 14 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

SAP NetWeaver AS ABAP and ABAP Platform, 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 8.04, 7.21, 7.21EXT, 7.22, 7.22EXT, 7.49, 7.53, KERNEL 8.04, 7.21, 7.21EXT, 7.22, 7.22EXT, 7.49, 7.53, 7.77, 7.81, 7.84, allows an attacker to send overlong content in the RFC request type thereby crashing the corresponding work process because of memory corruption vulnerability. The work process will attempt to restart itself after the crash and hence the impact on the availability is low.

Weakness: CWE-787

Which versions are affected by CVE-2021-33684?

It affects 2 products.

Products include Sap Netweaver Abap, Sap Netweaver Application Server Abap.

How do I fix CVE-2021-33684?

No fix has been published for CVE-2021-33684 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-33684 being exploited?

There is no known exploitation of CVE-2021-33684 in the wild and no public exploit code.

All Sap Netweaver Application Server Abap vulnerabilities

Sources

Also known as GHSA-69qv-phc7-2vh6.