CVE-2020-35111
4.3
MEDIUM
CVSS 3.1
EPSS 0.25%
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 CVE-2020-35111
To remediate CVE-2020-35111, upgrade the affected package to a fixed version below.
- —upgrade to 78.6.0esr-1 or later
- —upgrade to 1:78.6.0-1 or later
Is CVE-2020-35111 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 78.6.0esr-1
- from 0, < 1:78.6.0-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N |