HCL Sametime is vulnerable to arbitrary HTTP requests
Priority LOW 39CWE-472Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
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.
Why it matters now
EPSS 0.00736 54th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| HCL Software | Sametime | 11.6 | — | No fix listed | CNA |
- Sametime VendorHCL Software Affected 11.6 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:hcltech:sametime:11.6:*:*:*:*:*:*:* | 11.6 | Vulnerable | HCL Software |
- cpe:2.3:a:hcltech:sametime:11.6:*:*:*:*:*:*:* Versions 11.6 Vulnerable ·HCL Software
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-27770
- 2026-10-03 Alias added: GHSA-mxvv-v7w8-j88h
References
More HCL Software Sametime vulnerabilities
- TI-2023-27540 HCL Sametime is impacted by a Cross Site Request Forgery (CSRF) vulnerability CVSS 3.1HIGH 8.8
- TI-2021-09167 HCL Sametime is susceptible a file transfer service vulnerability CVSS 3.1HIGH 8.2
- TI-2022-20647 HCL Sametime 12.0 and 12.0FP1 anonymous users have directory lookup access CVSS 3.1MEDIUM 6.5
- TI-2023-24501 HCL Sametime is impacted by a failure to invalidate sessions CVSS 3.1HIGH 7.5
- TI-2023-24490 HCL Sametime is impacted by an autocomplete enabled vulnerability CVSS 3.1HIGH 7.5
- TI-2021-09168 HCL Sametime is vulnerable to an information disclosure CVSS 3.1HIGH 7.1
Sources
- CVE-2021-27770 · CVE Program
- CVE-2021-27770 · NVD
- FIRST EPSS
- GHSA-mxvv-v7w8-j88h · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences