CVE-2019-9791 EXPLOIT
9.8
CRITICAL · CVSS 3.1 · EPSS 19.9% (pctl 97)
Patch early
A public exploit exists.
Description
The type inference system allows the compilation of functions that can cause type confusions between arbitrary objects when compiled through the IonMonkey just-in-time (JIT) compiler and when the constructor function is entered through on-stack replacement (OSR). This allows for possible arbitrary reading and writing of objects during an exploitable crash. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 19.92% — more likely to be exploited than 97% of all CVEs |
| Weakness | CWE-843 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2019-04-26 |
| Last modified | 2026-06-17 |
Affected (6)
| Vendor | Product |
|---|---|
| mozilla | firefox |
| mozilla | thunderbird |
| redhat | enterprise linux |
| redhat | enterprise linux eus |
| redhat | enterprise linux server aus |
| redhat | enterprise linux server tus |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | Spidermonkey - IonMonkey Type Inference is Incorrect for Constructors Entered via OSR | 2019-03-26 |
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=1530958
- https://www.mozilla.org/security/advisories/mfsa2019-07/
- https://www.mozilla.org/security/advisories/mfsa2019-08/
- https://www.mozilla.org/security/advisories/mfsa2019-11/
- https://access.redhat.com/errata/RHSA-2019:0966
- https://access.redhat.com/errata/RHSA-2019:1144
- https://bugzilla.mozilla.org/show_bug.cgi?id=1530958
- https://www.mozilla.org/security/advisories/mfsa2019-07/
- https://www.mozilla.org/security/advisories/mfsa2019-08/
- https://www.mozilla.org/security/advisories/mfsa2019-11/
→ the Explorer · watch your stack · NVD