CVE-2016-6173

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2017-02-09 · updated 2026-06-17
Weakness: CWE-399

Description

NSD before 4.1.11 allows remote DNS master servers to cause a denial of service (/tmp disk consumption and slave server crash) via a zone transfer with unlimited data.

Affected products

NLnet Labs NSD: through 4.1.10

References

http://www.nlnetlabs.nl/svn/nsd/tags/NSD_4_1_11_REL/doc/RELNOTES
http://www.openwall.com/lists/oss-security/2016/07/06/3
http://www.openwall.com/lists/oss-security/2016/07/06/4
http://www.securityfocus.com/bid/91678
https://github.com/sischkg/xfer-limit/blob/master/README.md
https://lists.dns-oarc.net/pipermail/dns-operations/2016-July/015058.html
https://open.nlnetlabs.nl/pipermail/nsd-users/2016-August/002342.html
https://www.nlnetlabs.nl/bugs-script/show_bug.cgi?id=790
http://www.nlnetlabs.nl/svn/nsd/tags/NSD_4_1_11_REL/doc/RELNOTES
http://www.openwall.com/lists/oss-security/2016/07/06/3
http://www.openwall.com/lists/oss-security/2016/07/06/4
http://www.securityfocus.com/bid/91678

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