Exploited vulnerability · CISA KEV

Is CVE-2013-3163 exploited? Yes: in CISA KEV since 30 Mar 2023

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

Yes. CVE-2013-3163, Microsoft Internet Explorer Memory Corruption Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 30 Mar 2023, 3550 days after it was published. It affects Microsoft Internet Explorer. If you run it, CISA's required action is: The impacted product is end-of-life and should be disconnected if still in use.

exploitedYesCISA KEV · 30 Mar 2023

ransomwareNot knownno confirmed use

EPSStop 1%among the most likely CVEs to be exploited

severity8.8CVSS 3.1 · high

US federal due20 Apr 2023BOD 22-01 deadline

What it is

Microsoft Internet Explorer contains a memory corruption vulnerability that allows remote attackers to execute code or cause a denial of service via a crafted website.

Vendor	Microsoft (391 exploited CVEs in KEV)
Product	Internet Explorer
Vulnerability	Microsoft Internet Explorer Memory Corruption Vulnerability
Weakness	CWE-94
Published	10 Jul 2013
Added to KEV	30 Mar 2023
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. The impacted product is end-of-life and should be disconnected if still in use.
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 10 Jul 2013.
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-2012-4969: Microsoft Internet Explorer Use-After-Free Vulnerability (8 Jun 2022)

References

Questions

Is CVE-2013-3163 being exploited?

Yes. CISA added CVE-2013-3163 to the Known Exploited Vulnerabilities catalog on 30 Mar 2023, which means there is reliable evidence of exploitation in the wild.

Is CVE-2013-3163 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2013-3163?

The impacted product is end-of-life and should be disconnected if still in use. 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 March 2023 · Microsoft scorecard · act-now radar.

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