CVE-2021-33663

5.3 MEDIUM 0.8% exploit odds Fix listed

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. Limited direct impact.
Exploit odds: 0.8% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2021-06-09 14:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:54 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.8% in the next 30 days (EPSS).
Severity: 5.3 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2021-06-09 14:15 UTC
Last modified: 2026-06-17 03:54 UTC
Exploit probability: 0.8% · EPSS, next 30 days
Record status: Modified

Affected

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

Attack profile CVSS 3.1 · 5.3

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: Low
Availability: None

Raw vector

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

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-33663.md and follow it. Check whether this project is affected by CVE-2021-33663. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record