CVE-2011-1345Internet Explorer Vulnerability
Microsoft Internet Explorer 6, 7, and 8 does not properly handle objects in memory, which allows remote attackers to execute arbitrary code by accessing an object that (1) was not properly initialized or (2) is deleted, as demonstrated by Stephen Fewer as the first of three…
Published Mar 10, 2011 · Updated Apr 28, 2026
Key Facts
Patch immediately- CVE-2011-1345 is a critical-severity vulnerability (CVSS 9.3 v2) affecting Internet Explorer (Microsoft).
- It is exploited in the wild, listed in Industry KEV feed since May 16, 2011. No public exploit code is known.
- EPSS estimates a 41% 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.
Scores
CVSS v2
9.3
AV:N/AC:M/Au:N/C:C/I:C/A:C
EPSS (30-day exploit likelihood)
41%
Higher than 98.6% of all scored CVEs
Exploit maturity
Exploited (KEV)
ATLAS score
51/100
Publication score, see How it works
Exploitation Verdict
KEV listed
May 16, 2011
67 days after publication
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Exploited (KEV)
Public exploit code
0
Proof-of-concept links
In-the-wild evidence
1
Reports of active use
Description
Microsoft Internet Explorer 6, 7, and 8 does not properly handle objects in memory, which allows remote attackers to execute arbitrary code by accessing an object that (1) was not properly initialized or (2) is deleted, as demonstrated by Stephen Fewer as the first of three chained vulnerabilities during a Pwn2Own competition at CanSecWest 2011, aka "Object Management Memory Corruption Vulnerability."
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | May 16, 2011 | n/a | Not reported |
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Internet ExplorerMicrosoft | 8 | n/a |
Timeline
Publicly disclosed
Mar 10, 2011
Added to Industry KEV feed
May 16, 2011
Last updated
Apr 28, 2026
References
- exploitVulnCheck exploitation report
- otherdvlabs.tippingpoint.com · pwn2own-2011
- otherMS11-018
- otherms-ie-unspec-code-exec(66062)
- otheroval:org.mitre.oval:def:12228
FAQ
Common Questions.
Microsoft Internet Explorer 6, 7, and 8 does not properly handle objects in memory, which allows remote attackers to execute arbitrary code by accessing an object that (1) was not properly initialized or (2) is deleted, as demonstrated by Stephen Fewer as the first of three chained vulnerabilities during a Pwn2Own com…
Affected: Internet Explorer (Microsoft) versions 8. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since May 16, 2011.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
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.
Is CVE-2011-1345 On Your Attack Surface?
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