Is CVE-2021-43541 in the CISA KEV catalog?

No. CVE-2021-43541 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-43541?

CVE-2021-43541 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2021-43541?

CVE-2021-43541 has an EPSS score of 1.58% (72th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-43541?

Upgrade firefox on debian unstable to 95.0-1 or later. Fixes are available for 7 affected products.

CVE & CISA-KEV Catalog

CVE-2021-43541

MEDIUMEPSS 72th pctl

6.5

CVSS v3

NVD

Description

When invoking protocol handlers for external protocols, a supplied parameter URL containing spaces was not properly escaped. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.

How to fix

Remediation Available

firefoxDebian

Fixed in:95.0-1CVE-2021-43541

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

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

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

1.58%probability of exploitation in 30 days

72ndpercentile

Elevated risk: more likely to be exploited than 72% of all known CVEs.

References

Vendor Advisory4

Third-Party Advisory6

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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.