UpHeron
All vulnerabilities

Servers and applications

CVE-2014-0239

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.

Severity
Medium 5.0
Published
28 May 2014
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
4.0.18, 4.1.8
Exploit chance
67% in the next 30 daysHigher than 99% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Improper input validation (CWE-20)
Attack
Over the network · No login needed
Attacker can
Slow it down
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
Sources
NVD

Affected software

SoftwareAffected versions
SambaServers and applications · cpe:a:samba:samba
  • From 4.0.0 before 4.0.18
  • From 4.1.0 before 4.1.8

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2014-0239
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2014-0239