CVE-2003-0039

ISC dhcrelay (dhcp-relay) 3.0rc9 and earlier, and possibly other versions, allows remote attackers to cause a denial of service (packet storm) via a certain BOOTP packet that is forwarded to a broadcast MAC address, causing an infinite loop that is not restricted by a hop count.

Published: 2003-02-07 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2003-0039 is rated Moderate Risk (56.7/100): CVSS Medium severity, with high exploitation likelihood (EPSS 7.95%, 94th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +3.81% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize 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-2003-0039

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 2026-06-15 4.14% 7.95% +3.81%
2 2026-05-07 3.94% 4.14% +0.20%
3 2025-03-30 — 3.94% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2003-0039

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:N/I:N/A:P 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:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2003-0039

OS Trackers for CVE-2003-0039

vendor priority summary link
redhat — — https://access.redhat.com/security/cve/CVE-2003-0039

Affected software / configurations for CVE-2003-0039

Vendor Product Version Raw CPE
isc dhcpd 3.0.1 cpe:2.3:a:isc:dhcpd:3.0.1:rc1:*:*:*:*:*:*
isc dhcpd 3.0.1 cpe:2.3:a:isc:dhcpd:3.0.1:rc10:*:*:*:*:*:*
isc dhcpd 3.0.1 cpe:2.3:a:isc:dhcpd:3.0.1:rc2:*:*:*:*:*:*
isc dhcpd 3.0.1 cpe:2.3:a:isc:dhcpd:3.0.1:rc3:*:*:*:*:*:*
isc dhcpd 3.0.1 cpe:2.3:a:isc:dhcpd:3.0.1:rc4:*:*:*:*:*:*
isc dhcpd 3.0.1 cpe:2.3:a:isc:dhcpd:3.0.1:rc5:*:*:*:*:*:*
isc dhcpd 3.0.1 cpe:2.3:a:isc:dhcpd:3.0.1:rc6:*:*:*:*:*:*
isc dhcpd 3.0.1 cpe:2.3:a:isc:dhcpd:3.0.1:rc7:*:*:*:*:*:*
isc dhcpd 3.0.1 cpe:2.3:a:isc:dhcpd:3.0.1:rc8:*:*:*:*:*:*
isc dhcpd 3.0.1 cpe:2.3:a:isc:dhcpd:3.0.1:rc9:*:*:*:*:*:*

References for CVE-2003-0039

cvelogic Threat Intelligence