What is CVE-2013-7423?

CVE-2013-7423 is a vulnerability in GNU Glibc, classified under CWE-17. Published 2015-02-24.

Is CVE-2013-7423 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in GNU Glibc

CVE-2013-7423

The send_dg function in resolv/res_send.c in GNU C Library (aka glibc or libc6) before 2.20 does not properly reuse file descriptors, which allows remote attackers to send DNS queries to unintended locations via a large number of requests that trigger a call to the getaddrinfo function.

Published 2015-02-24 · last modified 2026-06-17.

CVSS v2 metric

CVSS v2 base score 5.0 (Medium). Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.058 (92.9th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 92.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.058 · newest: 0.058 · change: 0.000

Affected products

GNU Glibc
Canonical Ubuntu Linux — versions 10.04, 12.04, 14.04
openSUSE — versions 13.1, 13.2
Red Hat Enterprise Linux Server Aus — versions 6.5

Weakness classification (CWE)

CWE-17

Public proof-of-concept exploits

n0-traces/cve_

References

github.com/golang/go/issues/6336 (Third Party Advisory)
www.openwall.com/lists/oss-security/2015/01/28/20 (mailing-list, Mailing List, Third Party Advisory)
lists.opensuse.org/opensuse-updates/2015-02/msg00089.html (vendor-advisory, Third Party Advisory)
security.gentoo.org/glsa/201602-02 (vendor-advisory, Third Party Advisory)
sourceware.org/bugzilla/show_bug.cgi (Issue Tracking)
www.ubuntu.com/usn/USN-2519-1 (vendor-advisory, Third Party Advisory)
rhn.redhat.com/errata/RHSA-2015-0863.html (vendor-advisory)
www.securityfocus.com/bid/72844 (VDB Entry, Third Party Advisory, vdb-entry)
access.redhat.com/errata/RHSA-2016:1207 (vendor-advisory, Third Party Advisory)
seclists.org/fulldisclosure/2021/Sep/0 (mailing-list)

Frequently asked questions

What is CVE-2013-7423?: CVE-2013-7423 is a vulnerability in GNU Glibc, classified under CWE-17. Published 2015-02-24.
Is CVE-2013-7423 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.