Is CVE-2021-23996 in the CISA KEV catalog?

No. CVE-2021-23996 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-23996?

CVE-2021-23996 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2021-23996?

CVE-2021-23996 has an EPSS score of 0.72% (49th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-23996?

Upgrade firefox on debian unstable to 88.0-1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2021-23996

MEDIUM

6.5

CVSS v3

NVD

Description

By utilizing 3D CSS in conjunction with Javascript, content could have been rendered outside the webpage's viewport, resulting in a spoofing attack that could have been used for phishing or other attacks on a user. This vulnerability affects Firefox < 88.

How to fix

Remediation Available

firefoxDebian

Fixed in:88.0-1CVE-2021-23996

firefoxUbuntu

Fixed in:88.0+build2-0ubuntu0.16.04.1USN-4926-1

Fixed in:88.0+build2-0ubuntu0.18.04.2USN-4926-1

Fixed in:88.0+build2-0ubuntu0.20.04.1USN-4926-1

DeveloperEditionWindows application

Affected:88.0Fixed in:88.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:88.0Fixed in:88.0Mozilla

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.72%probability of exploitation in 30 days

49thpercentile

Moderate risk: more likely to be exploited than 49% of all known CVEs.

References

Vendor Advisory2

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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.