CVE-2014-0239
MediumThe 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…
Published May 28, 2014 · Updated Aug 11, 2026 · Also known as DEBIAN-CVE-2014-0239, UBUNTU-CVE-2014-0239
Key Facts
Patch immediately- CVE-2014-0239 is a medium-severity vulnerability (CVSS 5.0 v2) affecting Samba, rootio-samba, ctdb (suse) and 22 more products.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 67% probability of exploitation in the next 30 days.
- Fixed versions are available, including ctdb 4.5.0-1.1, ctdb-pcp-pmda 4.5.0-1.1, ctdb-tests 4.5.0-1.1.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v2
5.0
AV:N/AC:L/Au:N/C:N/I:N/A:P
EPSS (30-day exploit likelihood)
67%
Higher than 99.2% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2014-0239 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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
89 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| SambaSamba | See advisory | 4.0.18 |
| rootio-sambarootio | See advisory | 2:4.1.8+dfsg-1 |
| ctdbsuse | See advisory | 4.5.0-1.1 |
| ctdb-pcp-pmdasuse | See advisory | 4.5.0-1.1 |
| ctdb-testssuse | See advisory | 4.5.0-1.1 |
Patched Releases
ctdb
4.5.0-1.1
ctdb-pcp-pmda
4.5.0-1.1
ctdb-tests
4.5.0-1.1
libdcerpc-binding0
4.5.0-1.1
libdcerpc-binding0-32bit
4.5.0-1.1
libdcerpc-devel
4.5.0-1.1
libdcerpc-samr-devel
4.5.0-1.1
libdcerpc-samr0
4.5.0-1.1
libdcerpc-samr0-32bit
4.5.0-1.1
libdcerpc0
4.5.0-1.1
libdcerpc0-32bit
4.5.0-1.1
libndr-devel
4.5.0-1.1
libndr-krb5pac-devel
4.5.0-1.1
libndr-krb5pac0
4.5.0-1.1
libndr-krb5pac0-32bit
4.5.0-1.1
libndr-nbt-devel
4.5.0-1.1
libndr-nbt0
4.5.0-1.1
libndr-nbt0-32bit
4.5.0-1.1
libndr-standard-devel
4.5.0-1.1
libndr-standard0
4.5.0-1.1
libndr-standard0-32bit
4.5.0-1.1
libndr0
4.5.0-1.1
libndr0-32bit
4.5.0-1.1
libnetapi-devel
4.5.0-1.1
libnetapi0
4.5.0-1.1
Timeline
Publicly disclosed
May 28, 2014
Last updated
Aug 11, 2026
Weakness Type
- CWE-20 Improper Input Validation
References
- advisory59579
- advisoryGLSA-201502-15
- advisoryhttps://security-tracker.debian.org/tracker/CVE-2014-0239
- advisoryhttps://ubuntu.com/security/CVE-2014-0178
- advisoryhttps://ubuntu.com/security/CVE-2014-0239
FAQ
Common Questions.
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 relate…
Affected: Samba; rootio-samba; ctdb (suse), among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including ctdb 4.5.0-1.1, ctdb-pcp-pmda 4.5.0-1.1, ctdb-tests 4.5.0-1.1.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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