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CVE-2013-2494

15
FAUCET Score

CVE-2013-2494 describes a denial-of-service vulnerability in libdns within ISC DHCP 4.2.x before 4.2.5-P1. Remote name servers can exploit this flaw by sending specially crafted regular expressions, leading to memory exhaustion and system instability for machines running dhcpd. The vulnerability has a CVSS score of 4.9, indicating a high impact on availability with high attack complexity, and requires some authentication. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
4.2.0CPE matchmatch criteria
cpe:2.3:a:isc:dhcp:4.2.0:*:*:*:*:*:*:*
4.2.0CPE matchmatch criteria
cpe:2.3:a:isc:dhcp:4.2.0:a1:*:*:*:*:*:*
4.2.0CPE matchmatch criteria
cpe:2.3:a:isc:dhcp:4.2.0:a2:*:*:*:*:*:*
4.2.0CPE matchmatch criteria
cpe:2.3:a:isc:dhcp:4.2.0:b1:*:*:*:*:*:*
4.2.0CPE matchmatch criteria
cpe:2.3:a:isc:dhcp:4.2.0:b2:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.9MEDIUM

AV:N/AC:H/Au:S/C:N/I:N/A:C

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
SINGLE
Exploitability Score
3.9
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.17%
Probability of exploitation in next 30 days
EPSS Percentile
64.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0117 is in the 61st percentile among its peer group of 1,428 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2013-2494Moderate

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

Mar 26, 2013

References

kb.isc.org / article/AA-00880
Vendor Advisory