CVE-2021-27603 Denial of service in SAP NetWeaver AS for ABAP

Medium 6.5 Published 13 Apr 2021 Updated 3 Aug 2024

An attacker can exhaust work processes in SAP NetWeaver AS ABAP by repeatedly calling a specific function module, causing a denial of service.

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

What is CVE-2021-27603?

CVE-2021-27603 is a medium-severity denial of service vulnerability in Sap Netweaver Application Server Abap, published on 13 Apr 2021. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

An RFC enabled function module SPI_WAIT_MILLIS in SAP NetWeaver AS ABAP, versions - 731, 740, 750, allows to keep a work process busy for any length of time. An attacker could call this function module multiple times to block all work processes thereby causing Denial of Service and affecting the Availability of the SAP system.

Which versions are affected by CVE-2021-27603?

It affects 1 product.

Products include Sap Netweaver Application Server Abap.

How do I fix CVE-2021-27603?

No fix has been published for CVE-2021-27603 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-2021-27603 being exploited?

There is no known exploitation of CVE-2021-27603 in the wild and no public exploit code.

All Sap Netweaver Application Server Abap vulnerabilities

Sources

Also known as GHSA-7vfx-38v2-mc63.