CVE-2019-9816: mozilla firefox Type Confusion
Vulnerability summary
CVE-2019-9816 is a medium (CVSS 5.9) Type Confusion vulnerability in mozilla firefox. EPSS estimates a 6.15% chance of exploitation in the next 30 days, higher than 93.3% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 19 · Related 10Timeline
- 23-07-2019PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
A possible vulnerability exists where type confusion can occur when manipulating JavaScript objects in object groups, allowing for the bypassing of security checks within these groups. *Note: this vulnerability has only been demonstrated with UnboxedObjects, which are disabled by default on all supported releases.*. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.9MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- OSV · DebianEcosystem advisory · calculated5.9MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS trend
Probability
6.15%
Chance of exploitation in the next 30 days
Percentile
93%
Versus all other CVEs
30-day change
0.00 pp
From 6.15% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundSpidermonkey - IonMonkey Unexpected ObjectGroup in ObjectGroupDispatch Operation
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Ubuntu4 products
- firefox< 67.0+build2-0ubuntu0.16.04.1 | < 67.0+build2-0ubuntu0.18.04.1
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- thunderbird< 1:60.7.0+build1-0ubuntu0.16.04.1 | < 1:60.7.0+build1-0ubuntu0.18.04.1
Mozilla3 products
- firefox≥ unspecified, < 67 | < 67.0
- firefox_esr≥ unspecified, < 60.7 | < 60.7
- thunderbird≥ unspecified, < 60.7 | < 60.7
Debian2 products
- firefox-esr< 60.7.0esr-1
- thunderbird< 1:60.7.0-1
3 vendors · 9 products
