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HIGH · CVSS 8.8 CISA Known Exploited Vulnerability

CVE-2014-0322

Microsoft Internet Explorer Use-After-Free Vulnerability

Microsoft Internet Explorer

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.

CVSS
8.8
HIGH
EPSS
85.1%
30-day exploitation
Ransomware groups
0
recorded exploiting
Published
14 Feb 2014
CWE-416

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 4 May 2022. US federal agencies were required to remediate it by 25 May 2022.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 85.1%, which is higher than 99.7% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Frequently asked questions

Is CVE-2014-0322 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2014-0322.

What does CVE-2014-0322 affect?

CVE-2014-0322 affects Microsoft Internet Explorer. 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.

How severe is CVE-2014-0322?

CVE-2014-0322 is rated HIGH with a CVSS base score of 8.8. EPSS puts the probability of exploitation in the next 30 days at 85.1%, higher than 99.7% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 25 May 2022.

How should organisations respond to CVE-2014-0322?

Apply the vendor patch for Microsoft Internet Explorer as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.