What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-05-12 · updated 2026-06-17
• Weakness: CWE-472

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.

Affected products

• HCL Software Sametime: 11.6

References

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

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