High severity · published May 12, 2022
CVE-2021-27770
The vulnerability was discovered within the “FaviconService”
8.8
CVSS
0.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 54% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SA
Sametime · Hcltech
11.6 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-27770
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-27770
Vendor Advisory
https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0097430
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