CVE-2019-9813 EXPLOIT
8.8
HIGH · CVSS 3.0 · EPSS 7.4% (pctl 94)
Patch early
A public exploit exists.
Description
Incorrect handling of __proto__ mutations may lead to type confusion in IonMonkey JIT code and can be leveraged for arbitrary memory read and write. This vulnerability affects Firefox < 66.0.1, Firefox ESR < 60.6.1, and Thunderbird < 60.6.1.
Scoring
| CVSS | 8.8 (HIGH, v3.0) |
|---|---|
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| EPSS | 7.39% — more likely to be exploited than 94% of all CVEs |
| Weakness | CWE-843 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2019-04-26 |
| Last modified | 2026-06-17 |
Affected (2)
| Vendor | Product |
|---|---|
| mozilla | firefox |
| mozilla | thunderbird |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | SpiderMonkey - IonMonkey Compiled Code Fails to Update Inferred Property Types (Type Confusion) | 2019-04-03 |
References
- https://access.redhat.com/errata/RHSA-2019:0966
- https://access.redhat.com/errata/RHSA-2019:1144
- https://bugzilla.mozilla.org/show_bug.cgi?id=1538006
- https://www.mozilla.org/security/advisories/mfsa2019-09/
- https://www.mozilla.org/security/advisories/mfsa2019-10/
- https://www.mozilla.org/security/advisories/mfsa2019-12/
- https://access.redhat.com/errata/RHSA-2019:0966
- https://access.redhat.com/errata/RHSA-2019:1144
- https://bugzilla.mozilla.org/show_bug.cgi?id=1538006
- https://www.mozilla.org/security/advisories/mfsa2019-09/
- https://www.mozilla.org/security/advisories/mfsa2019-10/
- https://www.mozilla.org/security/advisories/mfsa2019-12/
→ the Explorer · watch your stack · NVD