CVE-2004-1166

CVE-2004-1166 is a high-severity vulnerability in Microsoft Ie with a CVSS 2.0 base score of 7.5. Its EPSS exploit-prediction score of 39% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-94.

Key facts

Description

CRLF injection vulnerability in Microsoft Internet Explorer 6.0.2800.1106 and earlier allows remote attackers to execute arbitrary FTP commands via an ftp:// URL that contains a URL-encoded newline ("%0a") before the FTP command, which causes the commands to be inserted into the resulting FTP session, as demonstrated using a PORT command.

Frequently asked questions

What is CVE-2004-1166?
CRLF injection vulnerability in Microsoft Internet Explorer 6.0.2800.1106 and earlier allows remote attackers to execute arbitrary FTP commands via an ftp:// URL that contains a URL-encoded newline ("%0a") before the FTP command, which causes the commands to be inserted into the resulting FTP session, as demonstrated using a PORT command.
How severe is CVE-2004-1166?
CVE-2004-1166 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2004-1166 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 39% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2004-1166?
CVE-2004-1166 primarily affects Microsoft Ie. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2004-1166?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2004-1166 published?
CVE-2004-1166 was published on 2004-12-31 and last updated on 2026-06-16.

References

Affected products (3)

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