CVE-2009-4444: microsoft internet_information_services
Vulnerability summary
CVE-2009-4444 is a medium (CVSS 6.0) vulnerability in microsoft internet_information_services. EPSS estimates a 63.63% chance of exploitation in the next 30 days, higher than 99.2% of scored vulnerabilities.
Timeline
- 29-12-2009PublishedVulnerability first disclosed.
- 16-09-2024Last modifiedVulnerability information updated.
Description
Microsoft Internet Information Services (IIS) 5.x and 6.x uses only the portion of a filename before a ; (semicolon) character to determine the file extension, which allows remote attackers to bypass intended extension restrictions of third-party upload applications via a filename with a (1) .asp, (2) .cer, or (3) .asa first extension, followed by a semicolon and a safe extension, as demonstrated by the use of asp.dll to handle a .asp;.jpg file.
CVSS metrics
1 score · 1 source · 1 versionEPSS trend
Probability
63.63%
Chance of exploitation in the next 30 days
Percentile
99%
Versus all other CVEs
30-day change
0.00 pp
From 63.63% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Microsoft1 product
- internet_information_services5.0 | 6.0
1 vendor · 1 product
References
6 links- blogs.technet.com/msrc/archive/2009/12/27/new-reports-of-a-vulnerability-in-iis.aspxX Refsource MISCBroken Link