CVE-2020-35111

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.

4.3

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.46%

Vendor Advisory mozilla.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org

Affected: Mozilla Firefox

Affected: Mozilla Thunderbird

Affected: Mozilla Firefox ESR

References

Link	Tags
https://www.mozilla.org/security/advisories/mfsa2020-54/	vendor advisory
https://www.mozilla.org/security/advisories/mfsa2020-56/	vendor advisory
https://www.mozilla.org/security/advisories/mfsa2020-55/	vendor advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1657916	permissions required

Frequently Asked Questions

What is the severity of CVE-2020-35111?: CVE-2020-35111 has been scored as a medium severity vulnerability.
How to fix CVE-2020-35111?: To fix CVE-2020-35111, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-35111 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2020-35111 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-35111?: CVE-2020-35111 affects Mozilla Firefox, Mozilla Thunderbird, Mozilla Firefox ESR.

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