CVE-2021-27634 Denial of service in SAP NetWeaver AS for ABAP (RFC Gateway)

High 7.5 Published 9 Jun 2021 Updated 3 Aug 2024

An unauthenticated attacker can crash the SAP NetWeaver RFC Gateway by sending a specially crafted packet, causing a denial of service.

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-2021-27634?

CVE-2021-27634 is a high-severity denial of service vulnerability in SAP NetWeaver AS for ABAP (RFC Gateway), published on 9 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

SAP NetWeaver AS for ABAP (RFC Gateway), versions - KRNL32NUC - 7.22,7.22EXT, KRNL64NUC - 7.22,7.22EXT,7.49, KRNL64UC - 8.04,7.22,7.22EXT,7.49,7.53,7.73, KERNEL - 7.22,8.04,7.49,7.53,7.73,7.77,7.81,7.82,7.83, allows an unauthenticated attacker without specific knowledge of the system to send a specially crafted packet over a network which will trigger an internal error in the system due to improper input validation in method ThCpicDtCreate () causing the system to crash and rendering it unavailable. In this attack, no data in the system can be viewed or modified.

Weakness: CWE-787

Which versions are affected by CVE-2021-27634?

It affects 1 product.

Products include Sap Netweaver Abap.

How do I fix CVE-2021-27634?

No fix has been published for CVE-2021-27634 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2021-27634 being exploited?

There is no known exploitation of CVE-2021-27634 in the wild and no public exploit code.

Sources

Also known as GHSA-v752-6j86-7g43.