CVE-2021-27770— HCL Sametime is vulnerable to arbitrary HTTP requests
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I. Basic Information for CVE-2021-27770
Vulnerability Information
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Vulnerability Title
HCL Sametime is vulnerable to arbitrary HTTP requests
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
对假设不可变Web参数的外部可控制
Source: NVD (National Vulnerability Database)
Vulnerability Title
HCL Technologies HCL Sametime 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HCL Sametime是HCL Technologies的一个会议解决方案。 HCL Technologies HCL Sametime 11.6版本存在安全漏洞，该漏洞源于FaviconService中对于外部URL缺少吸纳之。攻击者可以利用该漏洞指定在线会议将发生的外部 URL。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| HCL Software | Sametime | 11.6 | - |
II. Public POCs for CVE-2021-27770
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · HCL Software · 2022-05-12 · 7 CVEs total
| CVE-2021-27771 | 8.2 HIGH | HCL Sametime is susceptible a file transfer service vulnerability |
| CVE-2021-27777 | 7.5 HIGH | HCL Unica Platform is vulnerable to XML External Entity (XXE) injection |
| CVE-2021-27772 | 7.1 HIGH | HCL Sametime is vulnerable to an information disclosure |
| CVE-2021-27768 | 6.3 MEDIUM | An SSL certificate host verification vulnerability affects HCL Verse for Android |
| CVE-2021-27769 | 5.3 MEDIUM | HCL Sametime is vulnerable to an information disclosure |
| CVE-2021-27773 | 4.2 MEDIUM | HCL Sametime is vulnerable to clickjacking |
IV. Related Vulnerabilities
Same product: Sametime
- CVE-2025-62320
HTML Injection Leading to Data Exfiltration to External Serv - CVE-2025-31966
Boolean-Based SQL Injection in Multiple Unica Components - CVE-2026-21791
HCL Sametime for Android is affected by sensitive informatio - CVE-2023-50355
HCL Sametime is impacted by generation of error messages con - CVE-2024-30124
HCL Sametime is impacted by insecure services
Same vendor: HCL Software
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HCL BigFix Service Management (SM) does not adequately sanit - CVE-2025-31959
HCL BigFix Service Management (SM) application fails to stri - CVE-2025-31982
HCL BigFix Service Management (SM) had directories that were
V. Comments for CVE-2021-27770
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