Unspecified vulnerability in Microsoft Internet Explorer 5.01 SP4, 6, 6 SP1, and 7 allows remote attackers to execute arbitrary code via a…

published 2009-10-14 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-1543

cvss: 8.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 37.4%; EPSS 37.4% chance of exploitation in 30 days, percentile 98%
public exploits: 2; Exploit-DB

Unspecified vulnerability in Microsoft Internet Explorer 5.01 SP4, 6, 6 SP1, and 7 allows remote attackers to execute arbitrary code via a crafted data stream header that triggers memory corruption, aka "Data Stream Header Corruption Vulnerability."

Timeline

2009-10-13 First public exploit (EDB-33270)
2009-10-14 Published

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 21 mo ago (2025-01-21)

Exploit prediction

37.44% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

EDB-33270 Microsoft Internet Explorer 5.0.1 - 'deflate' HTTP Content Encoding Remote Code Execution remote, 2009-10-13
EDB-9893 Microsoft Internet Explorer 5/6/7 - Memory Corruption (MS09-054) remote, 2009-10-15

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	2.0	9.3	AV:N/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness

CWE-94 Improper Control of Generation of Code

References

docs.microsoft.com /en-us/security-updates/securitybulletins/2009/ms09-054
vendor-advisory
us-cert.gov /cas/techalerts/TA09-286A.html
third-party-advisory, us-government-resource
oval.cisecurity.org /repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6454
vdb-entry, signature

Sources

CVE List CVE-2009-1547
NVD CVE-2009-1547

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary