CVE-2020-35111: mozilla firefox
Vulnerability summary
CVE-2020-35111 is a medium (CVSS 4.3) vulnerability in mozilla firefox. EPSS estimates a 1.43% chance of exploitation in the next 30 days, higher than 72.6% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 30 · Related 14Timeline
- 07-01-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
- OSV · DebianEcosystem advisory · calculated4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
EPSS trend
Probability
1.43%
Chance of exploitation in the next 30 days
Percentile
73%
Versus all other CVEs
30-day change
+0.02 pp
From 1.42% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu6 products
- firefox< 84.0+build3-0ubuntu0.16.04.1 | < 84.0+build3-0ubuntu0.18.04.1 | < 84.0+build3-0ubuntu0.20.04.1
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- mozjs68All versions (No fix recorded)
- mozjs78All versions (No fix recorded)
Mozilla3 products
- firefox≥ unspecified, < 84 | < 84.0
- firefox_esr≥ unspecified, < 78.6 | < 78.6.0
- thunderbird≥ unspecified, < 78.6 | < 78.6.0
Debian2 products
- firefox-esr< 78.6.0esr-1
- thunderbird< 1:78.6.0-1
3 vendors · 11 products
