Is CVE-2022-28281 in the CISA KEV catalog?

No. CVE-2022-28281 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2022-28281?

CVE-2022-28281 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2022-28281?

CVE-2022-28281 has an EPSS score of 2.56% (83th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2022-28281?

Upgrade firefox on debian unstable to 99.0-1 or later. Fixes are available for 7 affected products.

CVE & CISA-KEV Catalog

CVE-2022-28281

HIGHEPSS 83th pctl

8.8

CVSS v3

NVD

Description

If a compromised content process sent an unexpected number of WebAuthN Extensions in a Register command to the parent process, an out of bounds write would have occurred leading to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 91.8, Firefox < 99, and Firefox ESR < 91.8.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

firefoxDebian

Fixed in:99.0-1CVE-2022-28281

firefoxUbuntu

Fixed in:99.0+build2-0ubuntu0.18.04.2USN-5370-1

Fixed in:99.0+build2-0ubuntu0.20.04.2USN-5370-1

thunderbirdUbuntu

Fixed in:1:91.8.1+build1-0ubuntu0.18.04.1USN-5393-1

Fixed in:1:91.8.1+build1-0ubuntu0.20.04.1USN-5393-1

DeveloperEditionWindows application

Affected:99.0Fixed in:99.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:99.0Fixed in:99.0Mozilla

Mozilla Firefox ESR (en-US)Windows application

Affected:91.8Fixed in:91.8Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:91.8Fixed in:91.8Mozilla

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

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

2.56%probability of exploitation in 30 days

83rdpercentile

Elevated risk: more likely to be exploited than 83% of all known CVEs.

References

Exploit4

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix

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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 2025-04-15.