CVE-2019-11763: canonical ubuntu_linux
Vulnerability summary
CVE-2019-11763 is a medium (CVSS 6.1) vulnerability in canonical ubuntu_linux. EPSS estimates a 1.15% chance of exploitation in the next 30 days, higher than 66.8% of scored vulnerabilities.
Not severe (CVSS 6.1, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 26 · Related 14Timeline
- 08-01-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
Failure to correctly handle null bytes when processing HTML entities resulted in Firefox incorrectly parsing these entities. This could have led to HTML comment text being treated as HTML which could have led to XSS in a web application under certain conditions. It could have also led to HTML entities being masked from filters - enabling the use of entities to mask the actual characters of interest from filters. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- OSV · DebianEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- OSV · AlpineEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS trend
Probability
1.15%
Chance of exploitation in the next 30 days
Percentile
67%
Versus all other CVEs
30-day change
Decrease -0.05 pp
From 1.20% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu4 products
- firefox< 70.0+build2-0ubuntu0.16.04.1 | < 70.0+build2-0ubuntu0.18.04.1 | < 70.0+build2-0ubuntu1
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- thunderbird< 1:68.7.0+build1-0ubuntu0.16.04.2 | < 1:68.2.1+build1-0ubuntu0.18.04.1
Alpine3 products
- firefox< 70.0-r0
- firefox-esr< 68.2.0-r0
- librewolf< 70.0-r0
Mozilla3 products
- firefox< 70 | < 70.0
- firefox esr< 68.2
- thunderbird< 68.2
Debian2 products
- firefox-esr< 68.2.0esr-1
- thunderbird< 1:68.2.1-1
Canonical1 product
- ubuntu_linuxEOL16.04
5 vendors · 13 products
