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CVE-2013-3163 Microsoft CVE debrief

CVE-2013-3163 is a Microsoft Internet Explorer memory corruption vulnerability that CISA lists in its Known Exploited Vulnerabilities catalog. The supplied corpus does not include a CVSS score, but the KEV listing indicates confirmed exploitation and a strong need to prioritize exposure reduction. CISA’s note says the impacted product is end-of-life and should be disconnected if still in use.

Vendor
Microsoft
Product
Internet Explorer
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2023-03-30
Original CVE updated
2023-03-30
Advisory published
2023-03-30
Advisory updated
2023-03-30

Who should care

Organizations that still have legacy Microsoft Internet Explorer in use, especially endpoint, desktop engineering, vulnerability management, and incident response teams. Any environment where IE remains installed or accessible should treat this as urgent.

Technical summary

The available source material identifies the issue as a memory corruption vulnerability in Microsoft Internet Explorer. CISA has added CVE-2013-3163 to the Known Exploited Vulnerabilities catalog, which means it has been observed as exploited in the wild or otherwise meets CISA’s KEV criteria. The supplied notes also indicate the impacted product is end-of-life.

Defensive priority

Urgent. If Internet Explorer is still present, reduce exposure immediately and disconnect affected legacy systems where removal is not possible.

Recommended defensive actions

  • Inventory all systems that still have Microsoft Internet Explorer installed or accessible.
  • Remove, disable, or block Internet Explorer wherever possible and move users to supported browsers.
  • If legacy IE cannot be eliminated immediately, disconnect affected systems from networks or isolate them as CISA recommends for end-of-life software.
  • Apply vendor guidance and any applicable Microsoft security bulletin remediation referenced in the source notes.
  • Review exposure, access paths, and compensating controls for any remaining IE-dependent workflows.
  • Prioritize incident response and vulnerability remediation workflows for KEV-listed assets.

Evidence notes

Evidence is limited to the supplied CVE title/description, the CISA KEV metadata, and the official CVE/NVD references. CISA’s source notes state the impacted product is end-of-life and should be disconnected if still in use. No CVSS score was supplied in the corpus, so severity should be treated as operationally urgent based on confirmed exploitation and legacy-product risk rather than a numeric score.

Official resources

CISA added CVE-2013-3163 to the Known Exploited Vulnerabilities catalog on 2023-03-30, with a due date of 2023-04-20. The supplied timeline should be treated as catalog timing, not the original vulnerability discovery date.