CVE & CISA-KEV Catalog

CVE-2021-29945

MEDIUM
6.5
CVSS v3
NVD

Description

The WebAssembly JIT could miscalculate the size of a return type, which could lead to a null read and result in a crash. *Note: This issue only affected x86-32 platforms. Other platforms are unaffected.*. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.

CWE-682

How to fix

Remediation Available
firefoxDebian
Fixed in:88.0-1CVE-2021-29945
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
thunderbirdUbuntu
Fixed in:1:78.11.0+build1-0ubuntu0.18.04.2USN-4995-2
Fixed in:1:78.11.0+build1-0ubuntu0.20.04.2USN-4995-1
DeveloperEditionWindows application
Affected:88.0Fixed in:88.0Mozilla
Mozilla Firefox (en-US)Windows application
Affected:88.0Fixed in:88.0Mozilla
Mozilla Firefox ESR (en-US)Windows application
Affected:78.10Fixed in:78.10Mozilla
Mozilla Thunderbird (en-US)Windows application
Affected:78.10Fixed in:78.10Mozilla

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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
IntegrityNone
AvailabilityHigh

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

Exploit Intelligence

1.21%probability of exploitation in 30 days
65thpercentile

Moderate risk: more likely to be exploited than 65% of all known CVEs.

References

Related Vulnerabilities

Other CWE-682 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2022-30780High7.556%-Fix
CVE-2020-14422Medium5.913%-Fix
CVE-2016-7433Medium5.39.8%-Fix
CVE-2023-35641High8.87.2%-Fix
CVE-2018-8319Critical9.87.0%--
CVE-2020-0022High8.86.1%-Fix

Common questions

How do I fix CVE-2021-29945?

Published advisories record a fix for 7 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2021-29945 being actively exploited?

Not that we know of. CVE-2021-29945 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.2% is the estimated probability that it will be exploited in the next 30 days. That is higher than 65% of all scored CVEs.

How severe is CVE-2021-29945?

CVE-2021-29945 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2021-29945 affect?

Published advisories record a fix for firefox (Debian), firefox (Ubuntu), thunderbird (Ubuntu), DeveloperEdition (Windows application), and 3 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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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.