CVE-2019-17026: Mozilla Firefox And Thunderbird Type Confusion Vulnerability
CVE-2019-17026 · Severity: critical · CVSS 8.8 · Exploited in the wild · Published 2021-11-03
A type confusion vulnerability exists in the Mozilla IonMonkey JIT compiler due to incorrect alias information when setting array elements. This flaw can be exploited to execute arbitrary code or cause a denial of service when processing malicious web content.
Yes. CVE-2019-17026 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.
How severe is CVE-2019-17026?
Critical severity, with a CVSS score of 8.8, published 3 November 2021.
Which products and versions are affected?
Mozilla Firefox < 72.0.1; Mozilla Firefox ESR < 68.4.1; Mozilla Thunderbird < 68.4.1.
Is there a fix for CVE-2019-17026?
A patch was published on 2020-01-08: Fixed in Firefox 72.0.1, Firefox ESR 68.4.1, and Thunderbird 68.4.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2019-17026 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2019-17026?
Check whether you run Mozilla Firefox or Mozilla Thunderbird. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Affected products
Mozilla Firefox < 72.0.1
Mozilla Firefox ESR < 68.4.1
Mozilla Thunderbird < 68.4.1
Timeline
2020-01-08: patched: Fixed in Firefox 72.0.1, Firefox ESR 68.4.1, and Thunderbird 68.4.1
2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
2021-11-03: disclosed: Publicly disclosed via NVD and CISA KEV catalog
2021-11-03: exploited: CISA confirms targeted attacks in the wild abusing this flaw.