Is CVE-2020-35111 in the CISA KEV catalog?

No. CVE-2020-35111 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-35111?

CVE-2020-35111 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2020-35111?

CVE-2020-35111 has an EPSS score of 1.17% (64th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-35111?

Upgrade firefox on debian unstable to 84.0-1 or later. Fixes are available for 6 affected products.

CVE & CISA-KEV Catalog

CVE-2020-35111

MEDIUM

4.3

CVSS v3

NVD

Description

When an extension with the proxy permission registered to receive <all_urls>, the proxy.onRequest callback was not triggered for view-source URLs. While web content cannot navigate to such URLs, a user opening View Source could have inadvertently leaked their IP address. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.

How to fix

Remediation Available

firefoxDebian

Fixed in:84.0-1CVE-2020-35111

firefoxUbuntu

Fixed in:84.0+build3-0ubuntu0.16.04.1USN-4671-1

Fixed in:84.0+build3-0ubuntu0.18.04.1USN-4671-1

Fixed in:84.0+build3-0ubuntu0.20.04.1USN-4671-1

DeveloperEditionWindows application

Affected:84.0Fixed in:84.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:84.0Fixed in:84.0Mozilla

Mozilla Firefox ESR (en-US)Windows application

Affected:78.6.0Fixed in:78.6.0Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:78.6.0Fixed in:78.6.0Mozilla

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

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

1.17%probability of exploitation in 30 days

64thpercentile

Moderate risk: more likely to be exploited than 64% of all known CVEs.

References

Vendor Advisory3

Other references1

bugzilla.mozilla.org

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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.