CVE-2021-43545

Q: How do I fix CVE-2021-43545?

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.

Q: Is CVE-2021-43545 being actively exploited?

Not that we know of. CVE-2021-43545 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.6% is the estimated probability that it will be exploited in the next 30 days. That is higher than 73% of all scored CVEs.

Q: How severe is CVE-2021-43545?

CVE-2021-43545 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.

Q: What does CVE-2021-43545 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.

MEDIUMEPSS 73th pctl

6.5

CVSS v3

NVD

Description

Using the Location API in a loop could have caused severe application hangs and crashes. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.

CWE-834

How to fix

Remediation Available

firefoxDebian

Fixed in:95.0-1CVE-2021-43545

firefoxUbuntu

Fixed in:95.0+build1-0ubuntu0.18.04.1USN-5186-1

Fixed in:95.0+build1-0ubuntu0.20.04.1USN-5186-1

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:95.0Fixed in:95.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:95.0Fixed in:95.0Mozilla

Mozilla Firefox ESR (en-US)Windows application

Affected:91.4.0Fixed in:91.4.0Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:91.4.0Fixed in:91.4.0Mozilla

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

1.60%probability of exploitation in 30 days

73rdpercentile

Elevated risk: more likely to be exploited than 73% of all known CVEs.

References

Vendor Advisory3

Third-Party Advisory6

Issue Tracking1

bugzilla.mozilla.org

Related Vulnerabilities

Other CWE-834 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-35515	High	7.5	12%	-	Fix
CVE-2021-39924	High	7.5	4.9%	-	Fix
CVE-2023-1993	Medium	6.3	4.1%	-	Fix
CVE-2018-14342	High	7.5	3.7%	-	Fix
CVE-2020-14303	High	7.5	3.5%	-	Fix
CVE-2018-9133	Medium	6.5	3.2%	-	Fix

Common questions

How do I fix CVE-2021-43545?

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-2021-43545 being actively exploited?

Not that we know of. CVE-2021-43545 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.6% is the estimated probability that it will be exploited in the next 30 days. That is higher than 73% of all scored CVEs.

How severe is CVE-2021-43545?

CVE-2021-43545 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-2021-43545 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.