Mozilla Firefox And Thunderbird Type Confusion Vulnerability (CVE-2019-17026)
Severity: high · Patch status: patched · Since 2021-11-03 · CVE-2019-17026
Mozilla Firefox and Thunderbird contain a type confusion vulnerability due to incorrect alias information in the IonMonkey JIT compiler when setting array elements. CISA added CVE-2019-17026 to its Known Exploited Vulnerabilities catalog on Nov 3, 2021, which means attackers are exploiting it in the wild.
What to do
- Apply updates per vendor instructions.
- US federal agencies must remediate by May 3, 2022 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch