Is CVE-2021-29980 in the CISA KEV catalog?

No. CVE-2021-29980 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-29980?

CVE-2021-29980 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2021-29980?

CVE-2021-29980 has an EPSS score of 1.41% (69th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-29980?

Upgrade firefox on debian unstable to 91.0-1 or later. Fixes are available for 7 affected products.

CVE & CISA-KEV Catalog

CVE-2021-29980

HIGH

8.8

CVSS v3

NVD

Description

Uninitialized memory in a canvas object could have caused an incorrect free() leading to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.

CWE-909

How to fix

Remediation Available

firefoxDebian

Fixed in:91.0-1CVE-2021-29980

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:1:78.13.0+build1-0ubuntu0.18.04.1USN-5058-1

Fixed in:1:78.13.0+build1-0ubuntu0.20.04.2USN-5058-1

DeveloperEditionWindows application

Affected:91.0Fixed in:91.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:91.0Fixed in:91.0Mozilla

Mozilla Firefox ESR (en-US)Windows application

Affected:78.13.0Fixed in:78.13.0Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:78.13.0Fixed in:78.13.0Mozilla

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

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.41%probability of exploitation in 30 days

69thpercentile

Moderate risk: more likely to be exploited than 69% of all known CVEs.

References

Exploit1

bugzilla.mozilla.org

Vendor Advisory4

Third-Party 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.