CVE & CISA-KEV Catalog

CVE-2021-27770

MEDIUM
6.8
CVSS v3
NVD

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.

CWE-472

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionRequired
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityLow
AvailabilityLow

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:L

Exploit Intelligence

0.67%probability of exploitation in 30 days
47thpercentile

Moderate risk: more likely to be exploited than 47% of all known CVEs.

References

Vendor Advisory1
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CVE-2021-27770 severity badge

Markdown

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HTML

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.