Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 96.0%; technical severity is CVSS 8.1.
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.
Who should care
- Teams operating Internet Explorer
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether Internet Explorer is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Microsoft Security patch 2458511.mspx
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Treatment intelligence
Remediation intelligence
Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.
Verification noteAutomated link verification has not completed for this guidance yet.
Patch
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-416
- Affected versions
- Microsoft Internet Explorer (Version 6 | Version 7 | Version 8)
- Fixed versions
- No explicit fixed version is currently recorded.
- Published
- 5 November 2010
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 96.0%
- Signal calculated at 83
External references
- CERT/CC Government advisory 899748
- CISA Government advisory CVE-2010-3962
- Blogs Technet Technical reference Microsoft Releases Security Advisory 2458511
- Secunia Technical reference
- Exploit Db Exploit information
- Exploit Db Exploit information
- Securityfocus Third-party advisory
- Securitytracker Third-party advisory
- Symantec Technical reference New Ie 0 Day Used Targeted Attacks
- Us Cert Government advisory TA10 348A
- Vupen Technical reference
- Exchange Xforce Ibmcloud Third-party advisory