What is CVE-2014-0322?

CVE-2014-0322 is a high-severity vulnerability in Microsoft Internet Explorer, classified under Use After Free. CVSS score: 8.8/10. Published 2014-02-14.

How severe is CVE-2014-0322?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2014-0322 known to be exploited?

Yes. CVE-2014-0322 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-05-04), indicating it is being actively exploited. 22 public proof-of-concept repositories are indexed.

Use After Free in Microsoft Internet Explorer

CVE-2014-0322

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.

Vulnerability class: Use-After-Free

Published 2014-02-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.851 (99.7th percentile), scored 2026-10-17.

High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.851 · newest: 0.851 · change: 0.000

Affected products

Microsoft Internet Explorer — versions 9, 10
Microsoft Windows 7
Microsoft Windows 8
Microsoft Windows Rt
Microsoft Windows Server 2008 — versions r2
Microsoft Windows Server 2012
Microsoft Windows Vista

Weakness classification (CWE)

CWE-416 — Use After Free

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2022-05-04. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-05-25.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

www.fireeye.com/blog/technical/cyber-exploits/2014/02/new-ie-zero-day-found-in-… (Broken Link)
www.osvdb.org/103354 (vdb-entry, Broken Link)
www.exploit-db.com/exploits/32851 (Exploit, VDB Entry, Third Party Advisory, exploit)
technet.microsoft.com/security/advisory/2934088 (Patch, Vendor Advisory)
docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-012 (vendor-advisory, Patch, Vendor Advisory)
www.kb.cert.org/vuls/id/732479 (US Government Resource, Third Party Advisory, third-party-advisory)
twitter.com/nanoc0re/statuses/434251658344673281 (Press/Media Coverage)
community.websense.com/blogs/securitylabs/archive/2014/02/13/msie-0-day-exploit… (Permissions Required, Broken Link)
www.dropbox.com/s/pyxjgycmudirbqe/CVE-2014-0322.zip (Exploit, Broken Link)
www.fireeye.com/blog/uncategorized/2014/02/operation-snowman-deputydog-actor-co… (Broken Link)

Frequently asked questions

What is CVE-2014-0322?: CVE-2014-0322 is a high-severity vulnerability in Microsoft Internet Explorer, classified under Use After Free. CVSS score: 8.8/10. Published 2014-02-14.
How severe is CVE-2014-0322?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2014-0322 known to be exploited?: Yes. CVE-2014-0322 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-05-04), indicating it is being actively exploited. 22 public proof-of-concept repositories are indexed.