CVE-2014-0322 — Microsoft Internet Explorer Use-After-Free Vulnerability

Use-after-free vulnerability in Microsoft Internet Explorer 9 and 10 allows remote attackers to execute arbitrary code via vectors involving crafted JavaScript code, CMarkup, and the onpropertychange attribute of a script element, as exploited in the wild in January and February

01What is this vulnerability?

Use-after-free vulnerability in Microsoft Internet Explorer 9 and 10 allows remote attackers to execute arbitrary code via vectors involving crafted JavaScript code, CMarkup, and the onpropertychange attribute of a script element, as exploited in the wild in January and February 2014.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2022-05-04. Ransomware use: Unknown.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2014-02-14T16:00:00.000Z
• Last modified: 2025-10-22T00:05:39.021Z
• Added to CISA KEV: 2022-05-04
• BOD 22-01 due: 2022-05-25

09References

• www.fireeye.com — http://www.fireeye.com/blog/technical/cyber-exploits/2014/02/new-ie-zero-day-fou…
• www.osvdb.org — http://www.osvdb.org/103354
• www.exploit-db.com — http://www.exploit-db.com/exploits/32851
• technet.microsoft.com — http://technet.microsoft.com/security/advisory/2934088
• docs.microsoft.com — https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-01…
• www.kb.cert.org — http://www.kb.cert.org/vuls/id/732479
• twitter.com — http://twitter.com/nanoc0re/statuses/434251658344673281
• community.websense.com — http://community.websense.com/blogs/securitylabs/archive/2014/02/13/msie-0-day-e…
• www.dropbox.com — https://www.dropbox.com/s/pyxjgycmudirbqe/CVE-2014-0322.zip
• www.fireeye.com — http://www.fireeye.com/blog/uncategorized/2014/02/operation-snowman-deputydog-ac…
• www.exploit-db.com — http://www.exploit-db.com/exploits/32904