CVE-2021-33663

CVE-2021-33663 is a medium-severity vulnerability in Sap Netweaver Application Server Abap with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

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.

Frequently asked questions

What is CVE-2021-33663?
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.
How severe is CVE-2021-33663?
CVE-2021-33663 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2021-33663 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-33663?
CVE-2021-33663 primarily affects Sap Netweaver Application Server Abap. In total, 23 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-33663?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-33663 published?
CVE-2021-33663 was published on 2021-06-09 and last updated on 2026-06-17.

References

Affected products (23)

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