Exploited vulnerability · CISA KEV

Is CVE-2019-1367 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Microsoft Internet Explorer · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2019-1367, Microsoft Internet Explorer Scripting Engine Memory Corruption Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 772 days after it was published. It is known to be used in ransomware campaigns. It affects Microsoft Internet Explorer. If you run it, CISA's required action is: Apply updates per vendor instructions.

What it is

Microsoft Internet Explorer contains a memory corruption vulnerability in how the scripting engine handles objects in memory. Successful exploitation allows for remote code execution in the context of the current user.

What to do

1. Check whether you run it. Look for Internet Explorer in your asset inventory, including appliances and cloud images. Stack check lists every exploited Microsoft CVE at once.
2. Apply the fix. Apply updates per vendor instructions.
3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 23 Sep 2019.
4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

Other exploited CVEs in Internet Explorer

• CVE-2010-0249: Microsoft Internet Explorer Use-After-Free Vulnerability (20 May 2026)
• CVE-2010-0806: Microsoft Internet Explorer Use-After-Free Vulnerability (20 May 2026)
• CVE-2010-3962: Microsoft Internet Explorer Uninitialized Memory Corruption Vulnerability (6 Oct 2025)
• CVE-2013-3893: Microsoft Internet Explorer Resource Management Errors Vulnerability (12 Aug 2025)
• CVE-2012-4792: Microsoft Internet Explorer Use-After-Free Vulnerability (23 Jul 2024)
• CVE-2013-3163: Microsoft Internet Explorer Memory Corruption Vulnerability (30 Mar 2023)

References

• nvd.nist.gov/vuln/detail/CVE-2019-1367

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in November 2021 · Microsoft scorecard · act-now radar.