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…

published 2013-03-28 13y ago modified 2026-06-16 4mo ago also EUVD-2013-2440

cvss: 4.9; version 2.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.2%; EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits: 0; none known

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.

Patch / fix

distros 1

isc-dhcp Debian 13, Debian 12 4.2.4-6

debian advisories DEBIAN-CVE-2013-2494

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2013-2494 updated 2026-11-05 cvss 2.1

dhcp: bind/libdns CVE-2013-2266 regular expressions excessive resource consumption DoS

Red Hat Enterprise Linux 4 dhcp Red Hat Enterprise Linux 5 dhcp Red Hat Enterprise Linux 6 dhcp, dhclient, dhcp-common
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.17% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	2.0	4.9	AV:N/AC:H/Au:S/C:N/I:N/A:C

Classification

Weakness

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

kb.isc.org /article/AA-00880/
vendor-advisory

Sources

CVE List CVE-2013-2494
NVD CVE-2013-2494

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