CVE-2009-1531
HIGHEPSS 98th pctlDescription
Microsoft Internet Explorer 7 for Windows XP SP2 and SP3; 7 for Server 2003 SP2; 7 for Vista Gold, SP1, and SP2; and 7 for Server 2008 SP2 allows remote attackers to execute arbitrary code via frequent calls to the getElementsByTagName function combined with the creation of an object during reordering of elements, followed by an onreadystatechange event, which triggers an access of an object that (1) was not properly initialized or (2) is deleted, aka "HTML Object Memory Corruption Vulnerability."
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v2 Vector
No CVSS vector data available.
Exploit Intelligence
Very high risk: more likely to be exploited than 98% of all known CVEs.
References
Related Vulnerabilities
Other CWE-399 (Resource Management Errors) vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2009-3103 | High | 10.0 | 90% | - | - |
| CVE-2009-0075 | High | 9.3 | 85% | - | - |
| CVE-2005-1790 | Low | 2.6 | 83% | - | - |
| CVE-2010-0806 | High | 8.8 | 82% | KEV | - |
| CVE-2009-2526 | High | 7.8 | 82% | - | - |
| CVE-2015-1868 | High | 7.8 | 82% | - | Fix |
Common questions
How do I fix CVE-2009-1531?
No published fix for CVE-2009-1531 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2009-1531 being actively exploited?
Not that we know of. CVE-2009-1531 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 35.1% is the estimated probability that it will be exploited in the next 30 days. That is higher than 98% of all scored CVEs.
How severe is CVE-2009-1531?
CVE-2009-1531 has a CVSS v2 base score of 9.3, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
Embed a live status badge for CVE-2009-1531
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.