CVE-2019-17026 KEV EXPLOIT
8.8
HIGH · CVSS 3.1 · EPSS 46.3% (pctl 99)
Patch first
On CISA KEV — known exploited in the wild, due 2022-05-03.
Description
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.
Scoring
| CVSS | 8.8 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| EPSS | 46.31% — more likely to be exploited than 99% of all CVEs |
| Weakness | CWE-843 |
| On CISA KEV | yes — remediate by 2022-05-03 |
| Public exploit | yes |
| Published | 2020-03-02 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | Mozilla Firefox And Thunderbird Type Confusion Vulnerability |
|---|---|
| Added | 2021-11-03 |
| Due | 2022-05-03 |
| Vendor / product | Mozilla / Firefox and Thunderbird |
| Ransomware use | none reported |
Affected (3)
| Vendor | Product |
|---|---|
| canonical | ubuntu linux |
| mozilla | firefox |
| mozilla | thunderbird |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | Firefox 72 IonMonkey - JIT Type Confusion | 2021-05-13 |
References
- http://packetstormsecurity.com/files/162568/Firefox-72-IonMonkey-JIT-Type-Confusion.html
- https://bugzilla.mozilla.org/show_bug.cgi?id=1607443
- https://security.gentoo.org/glsa/202003-02
- https://usn.ubuntu.com/4335-1/
- https://www.mozilla.org/security/advisories/mfsa2020-03/
- https://www.mozilla.org/security/advisories/mfsa2020-04/
- http://packetstormsecurity.com/files/162568/Firefox-72-IonMonkey-JIT-Type-Confusion.html
- https://bugzilla.mozilla.org/show_bug.cgi?id=1607443
- https://security.gentoo.org/glsa/202003-02
- https://usn.ubuntu.com/4335-1/
- https://www.mozilla.org/security/advisories/mfsa2020-03/
- https://www.mozilla.org/security/advisories/mfsa2020-04/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-17026
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