What is CVE-2021-21445?

CVE-2021-21445 is a medium-severity vulnerability in SAP Commerce Cloud, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 5.4/10. Published 2021-01-12.

How severe is CVE-2021-21445?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in SAP Commerce Cloud

CVE-2021-21445

SAP Commerce Cloud, versions - 1808, 1811, 1905, 2005, 2011, allows an authenticated attacker to include invalidated data in the HTTP response Content Type header, due to improper input validation, and sent to a Web user. A successful exploitation of this vulnerability may lead to advanced attacks, including cross-site scripting and page hijacking.

Vulnerability class: HTTP Request Smuggling

Published 2021-01-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (48.5th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

SAP Commerce Cloud — versions 1808, 1811, 1905
SAP Se Commerce Cloud — versions < 1808, < 1811, < 1905

Weakness classification (CWE)

CWE-444 — Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling)

References

wiki.scn.sap.com/wiki/pages/viewpage.action (Vendor Advisory)
launchpad.support.sap.com/ (Permissions Required)

Frequently asked questions

What is CVE-2021-21445?: CVE-2021-21445 is a medium-severity vulnerability in SAP Commerce Cloud, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 5.4/10. Published 2021-01-12.
How severe is CVE-2021-21445?: Medium severity. CVSS v3 base score is 5.4 out of 10.