Exploited vulnerability · CISA KEV

Is CVE-2020-0968 exploited? Yes: in CISA KEV since 3 Nov 2021

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

Yes. CVE-2020-0968, 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, 567 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.

exploitedYesCISA KEV · 3 Nov 2021

ransomwareKnownused in campaigns

EPSStop 5%very likely to be exploited

severity7.5CVSS 3.1 · high

US federal due3 May 2022BOD 22-01 deadline

What it is

Microsoft Internet Explorer contains a memory corruption vulnerability due to how the Scripting Engine handles objects in memory, leading to remote code execution.

Vendor	Microsoft (391 exploited CVEs in KEV)
Product	Internet Explorer
Vulnerability	Microsoft Internet Explorer Scripting Engine Memory Corruption Vulnerability
Weakness	CWE-787
Published	15 Apr 2020
Added to KEV	3 Nov 2021
Reported by (CNA)	microsoft

What to do

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.
Apply the fix. Apply updates per vendor instructions.
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 15 Apr 2020.
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-2020-0968

Questions

Is CVE-2020-0968 being exploited?

Yes. CISA added CVE-2020-0968 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2020-0968 used in ransomware attacks?

Yes, CISA lists it as known to be used in ransomware campaigns.

How do I fix CVE-2020-0968?

Apply updates per vendor instructions. Check Microsoft's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Internet Explorer and watch it for signs of compromise.

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.

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