CVE-2019-17026
Mozilla Firefox and Thunderbird: Type Confusion
As of , CVE-2019-17026 in Mozilla Firefox and Thunderbird is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch soon.
- Exploited
- Yes: CISA listed it on 3 November 2021
- US federal deadline
- 3 May 2022181 days after CISA listed it. US federal civilian agencies must fix it by then.
- Used in ransomware campaigns
- Not known to CISA
- EPSS score
- 0.46Higher than 98% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
- EPSS when listed
- Not availableCISA listed it before 4 February 2022, where the EPSS files we read begin.
- Public exploit
- 1 Exploit-DB entry
- Fix
- No vendor link in CISA's entry
What CISA says to do
Apply updates per vendor instructions.
CISA's required action
What the flaw is
Mozilla Firefox and Thunderbird contain a type confusion vulnerability due to incorrect alias information in the IonMonkey JIT compiler when setting array elements.
CISA's 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.
The CVE record's description, from mozilla
- CVE published
- 2 March 2020
- Assigned by
- mozilla
- CVSS
- 8.8 High (CVSS 3.1, from CISA-ADP)
- CWE-843
- Access of Resource Using Incompatible Type ('Type Confusion')
- CISA SSVC, exploitation
- active
- CISA SSVC, automatable
- no
- CISA SSVC, technical impact
- total
Timeline
- The CVE record was published.
- Exploit-DB published an exploit (EDB-ID 49864).
- CISA added it to its list of exploited vulnerabilities.
- The US federal deadline to fix it.
Public exploits
Facts from Metasploit's module list and Exploit-DB's index; we never copy exploit code.
- Exploit-DB: Firefox 72 IonMonkey - JIT Type ConfusionEDB-ID 49864, 13 May 2021
Firefox and Thunderbird: other exploited entries
| Vulnerability | Product | Our group | Listed | Deadline | EPSS |
|---|---|---|---|---|---|
| CVE-2013-1690Denial-of-Service | Mozilla Firefox and Thunderbird | Patch this weekMetasploit module; EPSS 0.69; verified Exploit-DB entry | 0.69 | ||
| CVE-2019-11708Sandbox Escape | Mozilla Firefox and Thunderbird | Patch this weekEPSS 0.56 | 0.56 | ||
| CVE-2019-11707Type Confusion | Mozilla Firefox and Thunderbird | Patch soonVerified Exploit-DB entry | 0.38 | ||
| CVE-2020-6820Use-After-Free | Mozilla Firefox and Thunderbird | Patch soon | 0.07 | ||
| CVE-2020-6819Use-After-Free | Mozilla Firefox and Thunderbird | Patch soon | 0.03 |
Read further
- CVE recordcve.org
- NVD entrynvd.nist.gov
- CISA's catalogcisa.gov
- EPSS for this CVEapi.first.org