Vulnerability Intelligence Report
Mozilla Firefox And Thunderbird Type Confusion Vulnerability
CVE-2019-17026
Incorrect alias information in IonMonkey JIT compiler for setting array elements could lead to a type confusion. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Firefox ESR < 68.4.1, Thunderbird < 68.4.1, and Firefox < 72.0.1.
CISA KEV
SSVC: Active Exploitation
CVSS Base Score
8.8
HIGH
Exploitability:2.9
Impact Score:5.9
EPSS Probability:46.59%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-843 ↗CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Mozilla | Firefox ESR | unspecified < 68.4.1 (affected) |
| Mozilla | Thunderbird | unspecified < 68.4.1 (affected) |
| Mozilla | Firefox | unspecified < 72.0.1 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Mozilla Corporation · Vendor · USA |
| Reserved | 2019-09-30T00:00:00 |
| Published | 2020-03-02T04:05:03 |
| Last Updated | 2025-10-21T23:35:50 |
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