CVE-2021-27631

Name: CVE-2021-27631
Creator: NVD / NIST
Published: 2021-06-09T14:15:09.18+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.51%

Last modified Jun 17, 2026

CVE-2021-27631 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. SAP NetWeaver ABAP Server and ABAP Platform (Enqueue Server), 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, 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 EnqConvUniToSrvReq() causing the system to crash and rendering it unavailable. In this attack, no data in the system can be viewed or modified.. EPSS estimates a 1.51% chance of exploitation in the next 30 days.

Description

SAP NetWeaver ABAP Server and ABAP Platform (Enqueue Server), 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, 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 EnqConvUniToSrvReq() causing the system to crash and rendering it unavailable. In this attack, no data in the system can be viewed or modified.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.51%

71.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Sap	Netweaver As Abap	kernel_7.22
Sap	Netweaver As Abap	kernel_7.49
Sap	Netweaver As Abap	kernel_7.53
Sap	Netweaver As Abap	kernel_7.73
Sap	Netweaver As Abap	kernel_7.77
Sap	Netweaver As Abap	kernel_7.81
Sap	Netweaver As Abap	kernel_7.82
Sap	Netweaver As Abap	kernel_7.83
Sap	Netweaver As Abap	kernel_8.04
Sap	Netweaver As Abap	krnl32nuc_7.22
Sap	Netweaver As Abap	krnl32nuc_7.22ext
Sap	Netweaver As Abap	krnl64nuc_7.22
Sap	Netweaver As Abap	krnl64nuc_7.22ext
Sap	Netweaver As Abap	krnl64nuc_7.49
Sap	Netweaver As Abap	krnl64uc_7.22
Sap	Netweaver As Abap	krnl64uc_7.22ext
Sap	Netweaver As Abap	krnl64uc_7.49
Sap	Netweaver As Abap	krnl64uc_7.53
Sap	Netweaver As Abap	krnl64uc_7.73
Sap	Netweaver As Abap	krnl64uc_8.04

References

https://launchpad.support.sap.com/#/notes/3020104Permissions Required, Vendor Advisory
https://wiki.scn.sap.com/wiki/pages/viewpage.action?pageId=578125999Broken Link, Vendor Advisory
https://launchpad.support.sap.com/#/notes/3020104Permissions Required, Vendor Advisory
https://wiki.scn.sap.com/wiki/pages/viewpage.action?pageId=578125999Broken Link, Vendor Advisory

Timeline

Published: Jun 9, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-27631?

How severe is CVE-2021-27631?

CVE-2021-27631 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.51% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27631?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-27631?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST