CVE-2010-3962
HighExploitedPublic exploitUse-after-free vulnerability in Microsoft Internet Explorer 6, 7, and 8 allows remote attackers to execute arbitrary code via vectors related to Cascading Style Sheets (CSS) token sequences and the clip attribute, aka an "invalid flag reference" issue or "Uninitialized Memory…
Published Nov 5, 2010 · Updated Apr 22, 2026
Key Facts
Patch immediately- CVE-2010-3962 is a high-severity vulnerability (CVSS 8.1 v3.1) affecting Internet Explorer (Microsoft).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 5, 2010. Public exploit code is available.
- EPSS estimates a 97% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
97%
Higher than 99.8% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2010-3962 brief as a PDF
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Description
Use-after-free vulnerability in Microsoft Internet Explorer 6, 7, and 8 allows remote attackers to execute arbitrary code via vectors related to Cascading Style Sheets (CSS) token sequences and the clip attribute, aka an "invalid flag reference" issue or "Uninitialized Memory Corruption Vulnerability," as exploited in the wild in November 2010.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Oct 6, 2025 | Oct 27, 2025 | Not reported |
| Industry KEV feed | Nov 5, 2010 | Oct 27, 2025 | Not reported |
| CIRCL KEV | Nov 5, 2010 | Oct 27, 2025 | Not reported |
| ENISA EUVD | Oct 6, 2025 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Internet ExplorerMicrosoft | 6, 7, 8 | n/a |
Timeline
Publicly disclosed
Nov 5, 2010
Added to Industry KEV feed
Nov 5, 2010
Added to CIRCL KEV
Nov 5, 2010
Added to CISA KEV
Oct 6, 2025
Added to ENISA EUVD
Oct 6, 2025
Last updated
Apr 22, 2026
Weakness Type
- CWE-416 Use After Free
References
- advisoryhttp://blogs.technet.com/b/msrc/archive/2010/11/02/microsoft-releases-security-advisory-2458511.aspx
- advisory42091
- advisoryms-ie-flag-code-execution(62962)
- advisory15418
- advisory15421
FAQ
Common Questions.
Use-after-free vulnerability in Microsoft Internet Explorer 6, 7, and 8 allows remote attackers to execute arbitrary code via vectors related to Cascading Style Sheets (CSS) token sequences and the clip attribute, aka an "invalid flag reference" issue or "Uninitialized Memory Corruption Vulnerability," as exploited in…
Affected: Internet Explorer (Microsoft) versions 6, 7, 8. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 5, 2010.
Yes. It was added on Oct 6, 2025 with a federal remediation due date of Oct 27, 2025.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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