What is CVE-2013-3163?

CVE-2013-3163 is a high-severity vulnerability in Microsoft Internet Explorer, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2013-07-10.

How severe is CVE-2013-3163?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2013-3163 known to be exploited?

Yes. CVE-2013-3163 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-03-30), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.

Buffer overflow in Microsoft Internet Explorer

CVE-2013-3163

Microsoft Internet Explorer 8 through 10 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka "Internet Explorer Memory Corruption Vulnerability," a different vulnerability than CVE-2013-3144 and CVE-2013-3151.

Vulnerability class: Buffer Overflow

Published 2013-07-10 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.707 (99.4th percentile), scored 2026-10-18.

High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.707 · newest: 0.707 · change: 0.000

Affected products

Microsoft Internet Explorer — versions 8, 9, 10
Microsoft Windows 7
Microsoft Windows 8
Microsoft Windows Rt
Microsoft Windows Server 2003
Microsoft Windows Server 2008 — versions r2
Microsoft Windows Server 2012
Microsoft Windows Vista
Microsoft Windows Xp

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2023-03-30. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2023-04-20.

Required action: The impacted product is end-of-life and should be disconnected if still in use.

Public proof-of-concept exploits

References

docs.microsoft.com/en-us/security-updates/securitybulletins/2013/ms13-055 (vendor-advisory, Patch, Vendor Advisory)
oval.cisecurity.org/repository/search/definition/oval:org.mitre.oval:def:17363 (Broken Link, signature, vdb-entry)
www.us-cert.gov/ncas/alerts/TA13-190A (US Government Resource, Third Party Advisory, third-party-advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2013-3163?: CVE-2013-3163 is a high-severity vulnerability in Microsoft Internet Explorer, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2013-07-10.
How severe is CVE-2013-3163?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2013-3163 known to be exploited?: Yes. CVE-2013-3163 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-03-30), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.