CVE-2004-1166Internet Explorer Code Injection
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…
Published Dec 31, 2004 · Updated Apr 15, 2026
Key Facts
Patch immediately- CVE-2004-1166 is a high-severity vulnerability (CVSS 7.5 v2) affecting Ie (Microsoft), Internet Explorer (Microsoft).
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 39% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Scores
CVSS v2
7.5
AV:N/AC:L/Au:N/C:P/I:P/A:P
EPSS (30-day exploit likelihood)
39%
Higher than 98.5% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
43/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
1
Proof-of-concept links
In-the-wild evidence
1
Reports of active use
Advisories And Exploit References
- advisory13404
- advisory29346
- advisoryADV-2006-3212
- advisoryADV-2008-0870
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.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| IeMicrosoft | 6.0-sp1, 6.0-sp2 | n/a |
| Internet ExplorerMicrosoft | 6.0 | n/a |
Timeline
Publicly disclosed
Dec 31, 2004
Last updated
Apr 15, 2026
Weakness Type
- CWE-94 Improper Control of Generation of Code ('Code Injection')
References
- advisory13404
- advisory29346
- advisoryADV-2006-3212
- advisoryADV-2008-0870
- exploitExploitDB-24800
FAQ
Common Questions.
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…
Affected: Ie (Microsoft) versions 6.0-sp1, 6.0-sp2; Internet Explorer (Microsoft) versions 6.0. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Is CVE-2004-1166 On Your Attack Surface?
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