CVE-2021-33663

Name: CVE-2021-33663
Creator: NVD / NIST
Published: 2021-06-09T14:15:10.01+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.77%

Last modified Jun 17, 2026

CVE-2021-33663 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. SAP NetWeaver AS ABAP, versions - KRNL32NUC - 7.22,7.22EXT, KRNL32UC - 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 - 7.22,8.04,7.49,7.53,7.73,7.77,7.81,7.82,7.83,7.84, allows an unauthorized attacker to insert cleartext commands due to improper restriction of I/O buffering into encrypted SMTP sessions over the network which can partially impact the integrity of the application.. EPSS estimates a 0.77% chance of exploitation in the next 30 days.

Description

SAP NetWeaver AS ABAP, versions - KRNL32NUC - 7.22,7.22EXT, KRNL32UC - 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 - 7.22,8.04,7.49,7.53,7.73,7.77,7.81,7.82,7.83,7.84, allows an unauthorized attacker to insert cleartext commands due to improper restriction of I/O buffering into encrypted SMTP sessions over the network which can partially impact the integrity of the application.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.77%

50.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Sap	Netweaver Application Server Abap	kernel_7.22
Sap	Netweaver Application Server Abap	kernel_7.49
Sap	Netweaver Application Server Abap	kernel_7.53
Sap	Netweaver Application Server Abap	kernel_7.73
Sap	Netweaver Application Server Abap	kernel_7.77
Sap	Netweaver Application Server Abap	kernel_7.81
Sap	Netweaver Application Server Abap	kernel_7.82
Sap	Netweaver Application Server Abap	kernel_7.83
Sap	Netweaver Application Server Abap	kernel_7.84
Sap	Netweaver Application Server Abap	kernel_8.04
Sap	Netweaver Application Server Abap	krnl32nuc_7.22
Sap	Netweaver Application Server Abap	krnl32nuc_7.22ext
Sap	Netweaver Application Server Abap	krnl32uc_7.22
Sap	Netweaver Application Server Abap	krnl32uc_7.22ext
Sap	Netweaver Application Server Abap	krnl64nuc_7.22
Sap	Netweaver Application Server Abap	krnl64nuc_7.22ext
Sap	Netweaver Application Server Abap	krnl64nuc_7.49
Sap	Netweaver Application Server Abap	krnl64uc_7.22
Sap	Netweaver Application Server Abap	krnl64uc_7.22ext
Sap	Netweaver Application Server Abap	krnl64uc_7.49
Sap	Netweaver Application Server Abap	krnl64uc_7.53
Sap	Netweaver Application Server Abap	krnl64uc_7.73
Sap	Netweaver Application Server Abap	krnl64uc_8.04

References

https://launchpad.support.sap.com/#/notes/3030604Permissions Required, Vendor Advisory
https://wiki.scn.sap.com/wiki/pages/viewpage.action?pageId=578125999Vendor Advisory
https://launchpad.support.sap.com/#/notes/3030604Permissions Required, Vendor Advisory
https://wiki.scn.sap.com/wiki/pages/viewpage.action?pageId=578125999Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-33663?

How severe is CVE-2021-33663?

CVE-2021-33663 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.77% probability of exploitation in the next 30 days.

How do I fix CVE-2021-33663?

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-2021-33663?

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

Scan your code now

Source: NVD / NIST