CVE-2013-2494

libdns in ISC DHCP 4.2.x before 4.2.5-P1 allows remote name servers to cause a denial of service (memory consumption) via vectors involving a regular expression, as demonstrated by a memory-exhaustion attack against a machine running a dhcpd process, a related issue to CVE-2013-2266.

Published: 2013-03-28 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2013-2494 is rated Moderate Risk (41.8/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.17%). 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-2013-2494

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 1.04% 1.17% +0.13%
2 2025-03-30 2.99% 1.04% -1.96%
3 2025-03-29 — 2.99% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2013-2494

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.9 2.0 MEDIUM
AV:N/AC:H/Au:S/C:N/I:N/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:H)
Exploitation requires uncommon or highly specific conditions.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 3.9 6.9 [email protected]

Weakness enumeration for CVE-2013-2494

OS Trackers for CVE-2013-2494

vendor priority summary link
debian low CVE-2013-2494 low priority: Debian including 1 source packages (isc-dhcp), 4 status rows across 4 suites (bookworm, bullseye, sid, trixie): resolved 4. https://security-tracker.debian.org/tracker/CVE-2013-2494
gentoo normal CVE-2013-2494: 1 GLSA(s) (201401-05), 1 atom(s) (net-misc/dhcp); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2013-2494
redhat medium — https://access.redhat.com/security/cve/CVE-2013-2494
ubuntu low CVE-2013-2494 low priority: Ubuntu including 2 source packages (dhcp3, isc-dhcp), 24 status rows across 12 suites (hardy, lucid, oneiric, precise, quantal, raring, saucy, trusty, upstream, utopic, vivid, wily): DNE 11, not-affected 8, ignored 4, released 1. https://ubuntu.com/security/CVE-2013-2494

Affected software / configurations for CVE-2013-2494

Vendor Product Version Raw CPE
isc dhcp 4.2.0 cpe:2.3:a:isc:dhcp:4.2.0:*:*:*:*:*:*:*
isc dhcp 4.2.0 cpe:2.3:a:isc:dhcp:4.2.0:a1:*:*:*:*:*:*
isc dhcp 4.2.0 cpe:2.3:a:isc:dhcp:4.2.0:a2:*:*:*:*:*:*
isc dhcp 4.2.0 cpe:2.3:a:isc:dhcp:4.2.0:b1:*:*:*:*:*:*
isc dhcp 4.2.0 cpe:2.3:a:isc:dhcp:4.2.0:b2:*:*:*:*:*:*
isc dhcp 4.2.0 cpe:2.3:a:isc:dhcp:4.2.0:p1:*:*:*:*:*:*
isc dhcp 4.2.0 cpe:2.3:a:isc:dhcp:4.2.0:rc1:*:*:*:*:*:*
isc dhcp 4.2.1 cpe:2.3:a:isc:dhcp:4.2.1:*:*:*:*:*:*:*
isc dhcp 4.2.1 cpe:2.3:a:isc:dhcp:4.2.1:b1:*:*:*:*:*:*
isc dhcp 4.2.1 cpe:2.3:a:isc:dhcp:4.2.1:rc1:*:*:*:*:*:*
isc dhcp 4.2.2 cpe:2.3:a:isc:dhcp:4.2.2:*:*:*:*:*:*:*
isc dhcp 4.2.2 cpe:2.3:a:isc:dhcp:4.2.2:b1:*:*:*:*:*:*
isc dhcp 4.2.2 cpe:2.3:a:isc:dhcp:4.2.2:rc1:*:*:*:*:*:*
isc dhcp 4.2.3 cpe:2.3:a:isc:dhcp:4.2.3:*:*:*:*:*:*:*
isc dhcp 4.2.3 cpe:2.3:a:isc:dhcp:4.2.3:p1:*:*:*:*:*:*
isc dhcp 4.2.3 cpe:2.3:a:isc:dhcp:4.2.3:p2:*:*:*:*:*:*
isc dhcp 4.2.4 cpe:2.3:a:isc:dhcp:4.2.4:*:*:*:*:*:*:*
isc dhcp 4.2.4 cpe:2.3:a:isc:dhcp:4.2.4:p1:*:*:*:*:*:*
isc dhcp 4.2.5 cpe:2.3:a:isc:dhcp:4.2.5:*:*:*:*:*:*:*

References for CVE-2013-2494

URL Tags
https://kb.isc.org/article/AA-00880/ Vendor Advisory
cvelogic Threat Intelligence