CVE-2020-15654: canonical ubuntu_linux Infinite Loop
Vulnerability summary
CVE-2020-15654 is a medium (CVSS 6.5) Infinite Loop vulnerability in canonical ubuntu_linux. EPSS estimates a 1.42% chance of exploitation in the next 30 days, higher than 72.5% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 14 · Related 10Timeline
- 10-08-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
When in an endless loop, a website specifying a custom cursor using CSS could make it look like the user is interacting with the user interface, when they are not. This could lead to a perceived broken state, especially when interactions with existing browser dialogs and warnings do not work. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.
CVSS metrics
3 scores · 2 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
EPSS trend
Probability
1.42%
Chance of exploitation in the next 30 days
Percentile
73%
Versus all other CVEs
30-day change
+0.20 pp
From 1.23% 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 causeAffected systems
Ubuntu5 products
- firefox< 79.0+build1-0ubuntu0.16.04.2 | < 79.0+build1-0ubuntu0.18.04.1 | < 79.0+build1-0ubuntu0.20.04.1
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- mozjs68All versions (No fix recorded)
- thunderbird< 1:78.8.1+build1-0ubuntu0.18.04.1 | < 1:78.7.1+build1-0ubuntu0.20.04.1
Mozilla3 products
- firefox≥ unspecified, < 79 | < 79.0
- firefox_esr≥ unspecified, < 78.1 | < 78.1
- thunderbird≥ unspecified, < 78.1 | < 78.1
Canonical1 product
- ubuntu_linuxEOL16.04 | 18.04 | 20.04
3 vendors · 9 products
References
11 links- lists.opensuse.org/opensuse-security-announce/2020-08/msg00025.htmlVendor AdvisoryX Refsource SUSEThird Party Advisory