CVE-2004-0679

The IP cloaking feature (cloak.c) in UnrealIRCd 3.2, and possibly other versions, uses a weak hashing scheme to hide IP addresses, which could allow remote attackers to use brute force methods to gain other user's IP addresses.

Published: 2004-08-06 Last update: 2026-04-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2004-0679 is rated Moderate Risk (46.4/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.85%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2004-0679

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-18 0.60% 0.85% +0.26%
2 2025-03-30 0.67% 0.60% -0.08%
3 2025-03-29 — 0.67% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2004-0679

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2004-0679

Affected software / configurations for CVE-2004-0679

Vendor Product Version Raw CPE
unreal unrealircd 3.1.1 cpe:2.3:a:unreal:unrealircd:3.1.1:*:*:*:*:*:*:*
unreal unrealircd 3.1.3 cpe:2.3:a:unreal:unrealircd:3.1.3:*:*:*:*:*:*:*
unreal unrealircd 3.2 cpe:2.3:a:unreal:unrealircd:3.2:*:*:*:*:*:*:*
unreal unrealircd 3.2_.0_beta_10 cpe:2.3:a:unreal:unrealircd:3.2_.0_beta_10:*:*:*:*:*:*:*

References for CVE-2004-0679

cvelogic Threat Intelligence