CVE-2014-0239

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 66.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2014-05-28 · updated 2026-06-17
Weakness: CWE-20

Description

The internal DNS server in Samba 4.x before 4.0.18 does not check the QR field in the header section of an incoming DNS message before sending a response, which allows remote attackers to cause a denial of service (CPU and bandwidth consumption) via a forged response packet that triggers a communication loop, a related issue to CVE-1999-0103.

Affected products

Samba: from 4.0.0 before 4.0.18; from 4.1.0 before 4.1.8 — fixed in 4.0.18, 4.1.8

How to fix

Upgrade to a fixed version: Samba 4.0.18, 4.1.8. Check the vendor advisory for mitigations.

References

http://secunia.com/advisories/59579
http://security.gentoo.org/glsa/glsa-201502-15.xml
http://www.samba.org/samba/security/CVE-2014-0239
http://www.securityfocus.com/bid/67691
http://www.securitytracker.com/id/1030309
http://secunia.com/advisories/59579
http://security.gentoo.org/glsa/glsa-201502-15.xml
http://www.samba.org/samba/security/CVE-2014-0239
http://www.securityfocus.com/bid/67691
http://www.securitytracker.com/id/1030309

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