Microsoft — Microsoft Internet Explorer Uninitialized Memory Corruption Vulnerability
CISA KEV · in the CISA KEV catalog since 2025-10-06
Listed in the CISA KEV catalog, and an EPSS probability of 0.968.
Patch Immediately
The priority band answers “how soon”, not “how bad” — see Methodology for what it weighs and where it abstains.
| Measure | Value | Source | What it means |
|---|---|---|---|
| CVSS base score | 8.1 | NVD | How severe the flaw is in itself. It does not say how likely an attack is. |
| FIRST EPSS | 0.968 (99.89th pctl) | FIRST | FIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. |
| Actively exploited | Confirmed | CISA KEV | Whether a source of record has confirmed attacks using it in the wild. |
| Ransomware campaign use | Unknown or none | CISA KEV | Whether CISA has seen ransomware operators use it. |
| CISA remediation deadline | 2025-10-27 — KEV since 2025 · listed over a year | CISA KEV | The date US federal agencies must have fixed or mitigated it. |
| Public exploit module | Public module exists | Metasploit | Module existing is not the same as active exploitation. |
| EUVD cross-reference | Listed | ENISA EUVD | ENISA's own vulnerability database entry for this CVE, where one exists. |
Impacted software or hardware
Remediation: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Remediation basis: CISA KEV required action
ENISA EUVD also lists this CVE at CVSS 8.1 (v3.1), assigned by microsoft. Source: euvd.enisa.europa.eu.
Metasploit lists a public good-rank module for this CVE: MS10-090 Microsoft Internet Explorer CSS SetUserClip Memory Corruption (windows/browser/ms10_090_ie_css_clip) — module existing is not the same as active exploitation; see metasploit.com.
This page is an opinion about urgency. Where it and a source of record disagree, the source of record is the record.
Where this sits
CVE-2010-3962 is a Microsoft entry in the CISA KEV catalog. The priority feed ranks Microsoft's current monthly release rather than older Microsoft CVEs, so this one is not listed there; the page above scores it from the same sources.
