Is CVE-2013-7423 in the CISA KEV catalog?

No. CVE-2013-7423 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2013-7423?

CVE-2013-7423 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2013-7423?

CVE-2013-7423 has an EPSS score of 5.81% (92th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2013-7423?

Upgrade glibc on debian 11 to 2.19-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2013-7423

MEDIUMEPSS 92th pctl

5.0

CVSS v2

NVD

Description

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.

CWE-17

How to fix

Remediation Available

glibcDebian

Fixed in:2.19-1CVE-2013-7423

eglibcUbuntu

Fixed in:2.19-0ubuntu6.6USN-2519-1

libc6Ubuntu

Fixed in:2.19-0ubuntu6.6USN-2519-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

5.81%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

References

Third-Party Advisory7

Issue Tracking1

sourceware.org

Other references3

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.