CVE-2019-1429: Microsoft Internet Explorer Scripting Engine Memory Corruption Vulnerability

Vulnerability summary

CVE-2019-1429 is a high (CVSS 7.6) Use After Free vulnerability in Microsoft Internet Explorer. It is known to be exploited: CISA lists it, first on 03-11-2021. EPSS estimates a 77.29% chance of exploitation in the next 30 days, higher than 99.5% of scored vulnerabilities. 2 public exploits are recorded.

Timeline

1. 12-11-2019
   PublishedVulnerability first disclosed.
2. 03-11-2021
   Added to CISA KEVMicrosoft Internet Explorer Scripting Engine Memory Corruption Vulnerability
3. 03-05-2022
   CISA remediation dueApply updates per vendor instructions.
4. 12-01-2026
   Last modifiedVulnerability information updated.

Description

A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer, aka 'Scripting Engine Memory Corruption Vulnerability'. This CVE ID is unique from CVE-2019-1426, CVE-2019-1427, CVE-2019-1428.

• CWE-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.