CVE-2021-27631 Explained : Impact and Mitigation

A detailed analysis of CVE-2021-27631 focusing on the impact, technical details, and mitigation steps.

Understanding CVE-2021-27631

This section provides insights into the nature and consequences of the CVE-2021-27631 vulnerability.

What is CVE-2021-27631?

The CVE-2021-27631 vulnerability affects SAP NetWeaver ABAP Server and ABAP Platform (Enqueue Server) versions. It allows an unauthorized attacker to trigger internal errors in the system, leading to a system crash and unavailability. The attack does not allow viewing or modification of system data.

The Impact of CVE-2021-27631

The impact of this vulnerability includes the potential for system crashes and rendering the SAP NetWeaver ABAP Server and ABAP Platform (Enqueue Server) unavailable to legitimate users.

Technical Details of CVE-2021-27631

Explore the technical aspects of CVE-2021-27631 below.

Vulnerability Description

The vulnerability arises from improper input validation in the method EnqConvUniToSrvReq(), allowing attackers to send specially crafted packets over a network to trigger internal errors.

Affected Systems and Versions

Vendor: SAP SE
Affected Product: SAP NetWeaver ABAP Server and ABAP Platform (Enqueue Server)
Affected Versions:
KRNL32NUC - 7.22
7.22EXT
KRNL64NUC - 7.22
7.49
KRNL64UC - 8.04
7.22
7.53
7.73
KERNEL - 7.22
8.04

Exploitation Mechanism

The vulnerability can be exploited by an unauthenticated attacker without specific system knowledge by sending a particular network packet to trigger internal errors and crash the system.

Mitigation and Prevention

Learn how to address CVE-2021-27631 and prevent future occurrences.

Immediate Steps to Take

It is crucial to apply security patches provided by SAP to remediate CVE-2021-27631. Additionally, network segmentation and access controls can limit exposure.

Long-Term Security Practices

Regular security audits, employee training on secure coding practices, and continuous monitoring can enhance overall system security and resilience.

Patching and Updates

Stay updated on security bulletins and advisories from SAP to ensure prompt implementation of patches and updates.