Is CVE-2021-29982 in the CISA KEV catalog?

No. CVE-2021-29982 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-29982?

CVE-2021-29982 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2021-29982?

CVE-2021-29982 has an EPSS score of 1.12% (62th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-29982?

Upgrade firefox on debian unstable to 91.0-1 or later. Fixes are available for 6 affected products.

CVE & CISA-KEV Catalog

CVE-2021-29982

MEDIUM

6.5

CVSS v3

NVD

Description

Due to incorrect JIT optimization, we incorrectly interpreted data from the wrong type of object, resulting in the potential leak of a single bit of memory. This vulnerability affects Firefox < 91 and Thunderbird < 91.

CWE-772

How to fix

Remediation Available

firefoxDebian

Fixed in:91.0-1CVE-2021-29982

firefoxUbuntu

Fixed in:91.0+build2-0ubuntu0.18.04.1USN-5037-1

Fixed in:91.0+build2-0ubuntu0.20.04.1USN-5037-1

thunderbirdUbuntu

Fixed in:1:91.5.0+build1-0ubuntu0.18.04.1USN-5248-1

Fixed in:1:91.5.0+build1-0ubuntu0.20.04.1USN-5248-1

DeveloperEditionWindows application

Affected:91.0Fixed in:91.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:91.0Fixed in:91.0Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:91.0Fixed in:91.0Mozilla

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

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

1.12%probability of exploitation in 30 days

62ndpercentile

Moderate risk: more likely to be exploited than 62% of all known CVEs.

References

Exploit1

bugzilla.mozilla.org

Vendor Advisory2

Third-Party Advisory1

security.gentoo.org

Related Vulnerabilities

Other CWE-772 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2003-0132	Medium	5.0	87%	-	Fix
CVE-2017-14495	High	7.5	84%	-	Fix
CVE-2021-22883	High	7.5	77%	-	Fix
CVE-2024-2398	High	8.6	36%	-	Fix
CVE-2020-9375	High	7.5	28%	-	-
CVE-1999-1127	High	7.5	18%	-	-

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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.