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Vulnerability record · CVE-2009-0647 · published 19 February 2009

CVE-2009-0647: Microsoft windows live messenger improper input validation vulnerability

Microsoft · Windows Live Messenger

msnmsgr.exe in Windows Live Messenger (WLM) 2009 build 14.0.8064.206, and other 14.0.8064.x builds, allows remote attackers to cause a denial of service (application crash) via a modified header in a packet, as possibly demonstrated by a UTF-8.0 value of the charset field in the Content-Type header line. NOTE: this has been reported as a format string vulnerability by some sources, but the provenance of that information is unknown.

5.0 CVSS 2.0 Medium EPSS 17% · top 3.0% CWE-20 · Improper input validation
5.0CVSS 2.0 base score
17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References
16 Jun 2026Last modified by NVD

Description

msnmsgr.exe in Windows Live Messenger (WLM) 2009 build 14.0.8064.206, and other 14.0.8064.x builds, allows remote attackers to cause a denial of service (application crash) via a modified header in a packet, as possibly demonstrated by a UTF-8.0 value of the charset field in the Content-Type header line. NOTE: this has been reported as a format string vulnerability by some sources, but the provenance of that information is unknown.

AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://secunia.com/advisories/33985 Vendor Advisory
http://www.securityfocus.com/archive/1/501043/100/0/threaded
http://www.securityfocus.com/bid/33825
http://www.vupen.com/english/advisories/2009/0466 Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/48810
http://secunia.com/advisories/33985 Vendor Advisory
http://www.securityfocus.com/archive/1/501043/100/0/threaded
http://www.securityfocus.com/bid/33825
http://www.vupen.com/english/advisories/2009/0466 Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/48810

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2009-0647), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.