CVE-2019-9807: mozilla firefox Improper Input Validation
Vulnerability summary
CVE-2019-9807 is a medium (CVSS 4.3) Improper Input Validation vulnerability in mozilla firefox. EPSS estimates a 0.79% chance of exploitation in the next 30 days, higher than 55.3% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 4 · Related 4Timeline
- 26-04-2019PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
When arbitrary text is sent over an FTP connection and a page reload is initiated, it is possible to create a modal alert message with this text as the content. This could potentially be used for social engineering attacks. This vulnerability affects Firefox < 66.
CVSS metrics
3 scores · 2 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated4.3MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
EPSS trend
Probability
0.79%
Chance of exploitation in the next 30 days
Percentile
55%
Versus all other CVEs
30-day change
0.00 pp
From 0.79% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (bugzilla.mozilla.org)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Ubuntu3 products
- firefox< 66.0.1+build1-0ubuntu0.14.04.1 | < 66.0+build3-0ubuntu0.16.04.2 | < 66.0+build3-0ubuntu0.18.04.1
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
Mozilla1 product
- firefox≥ unspecified, < 66 | < 66.0
2 vendors · 4 products