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Fencer Intel
medium 5.0

CVE-2014-0239 json

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 send…

published 2014-05-28 12 y ago modified 2026-06-17 4 mo ago also EUVD-2014-0277

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
66.8%
EPSS 66.8% chance of exploitation in 30 days, percentile 99.2%
public exploits
0
none known

Summary

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.

Patch / fix

  • samba samba 4.0.18, 4.1.8
  • samba Debian 14, Debian 13, Debian 12 2:4.1.8+dfsg-1

debian advisories DEBIAN-CVE-2014-0239

  • samba Ubuntu 14.04 LTS 2:4.1.6+dfsg-1ubuntu2.14.04.2

ubuntu advisories UBUNTU-CVE-2014-0239

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • samba openSUSE Tumbleweed 4.5.0-1.1

opensuse advisories openSUSE-SU-2024:10069-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2014-0239 updated cvss 1.8

samba: potential DoS in the internal DNS server

  • Red Hat Enterprise Linux 4 samba Red Hat Enterprise Linux 5 samba, samba3x Red Hat Enterprise Linux 6 samba, samba4, samba4-dc, samba-swat, samba4-libs, samba4-pidl, +17 more Red Hat Enterprise Linux 7 ctdb, samba, samba-dc, ctdb-tests, samba-libs, samba-pidl, +18 more Red Hat Storage 2 samba
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

66.81% chance of exploitation in the next 30 days, higher than 99.2% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.