What is CVE-2021-27777?

CVE-2021-27777 is a high-severity vulnerability in Hcl Software Unica, classified under XML Injection (Blind XPath Injection). CVSS score: 7.5/10. Published 2022-05-12.

How severe is CVE-2021-27777?

High severity. CVSS v3 base score is 7.5 out of 10.

XPath Injection in Hcl Software Unica

CVE-2021-27777

XML External Entity (XXE) injection vulnerabilities occur when poorly configured XML parsers process user supplied input without sufficient validation. Attackers can exploit this vulnerability to manipulate XML content and inject malicious external entity references.

Published 2022-05-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.008 (56.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: +0.000

Affected products

Hcl Software Unica — versions 12 and below
Hcltech Unica

Weakness classification (CWE)

References

support.hcltechsw.com/csm (Vendor Advisory)

Frequently asked questions

What is CVE-2021-27777?: CVE-2021-27777 is a high-severity vulnerability in Hcl Software Unica, classified under XML Injection (Blind XPath Injection). CVSS score: 7.5/10. Published 2022-05-12.
How severe is CVE-2021-27777?: High severity. CVSS v3 base score is 7.5 out of 10.