CVE-2004-0777

Format string vulnerability in the auth_debug function in Courier-IMAP 1.6.0 through 2.2.1 and 3...

7.5 HighPublic exploitFix available

Format string vulnerability in the auth_debug function in Courier-IMAP 1.6.0 through 2.2.1 and 3.x through 3.0.3, when login debugging (DEBUG_LOGIN) is enabled, allows remote attackers to execute arbitrary code.

Exploit likelihood

10.9%Up 3.2 points since Feb 4, 2022

What each source reports

NVD Score used 7.5

Record: CVE-2004-0777
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-134
Updated: 2026-11-02

CVE List No score

Record: CVE-2004-0777
Updated: 2026-11-02

EUVDEUVD-2004-0775 No score

Record: EUVD-2004-0775
Updated: 2026-11-03

GitHub AdvisoriesGHSA-25j9-9wxp-hpp7 No score

Format string vulnerability in the auth_debug function in Courier-IMAP 1.6.0 through 2.2.1 and 3...

Record: GHSA-25j9-9wxp-hpp7
Weakness: CWE-134
Updated: 2026-11-02

OSV No score

Record: CVE-2004-0777
Updated: 2026-11-02

OSVDEBIAN-CVE-2004-0777 No score

Record: DEBIAN-CVE-2004-0777
Updated: 2026-11-02

Affected products

inter7 courier-imap

Affected packages

Affected packages
Package	Affected	Fixed
`courier` Debian:12	before 0.45.6-1	0.45.6-1
`courier` Debian:13	before 0.45.6-1	0.45.6-1
`courier` Debian:14	before 0.45.6-1	0.45.6-1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
Exploit-DB	Courier-IMAP 3.0.2-r1 - 'auth_debug()' Remote Format String	2004-09-02

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, Exploit-DB, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2004-0777 is a high vulnerability (CVSS 7.5) in Inter7 Courier-imap, published August 19, 2004. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 10.9%, the 95th percentile. Fixed in courier 0.45.6-1.