CVE-2016-6170

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 40.9% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2016-07-06 · updated 2026-06-17
Weakness: CWE-20

Description

ISC BIND through 9.9.9-P1, 9.10.x through 9.10.4-P1, and 9.11.x through 9.11.0b1 allows primary DNS servers to cause a denial of service (secondary DNS server crash) via a large AXFR response, and possibly allows IXFR servers to cause a denial of service (IXFR client crash) via a large IXFR response and allows remote authenticated users to cause a denial of service (primary DNS server crash) via a large UPDATE message.

Affected products

ISC BIND: from 9.0 through 9.9.8; from 9.10.0 through 9.10.3; 9.9.9, 9.9.9-beta1, 9.9.9-beta2, 9.9.9-p1, 9.10.4, 9.10.4-p1 (+4)
Red Hat Enterprise Linux: 5.0, 6.0, 7.0

References

http://www.openwall.com/lists/oss-security/2016/07/06/3
http://www.securityfocus.com/bid/91611
http://www.securitytracker.com/id/1036241
https://bugzilla.redhat.com/show_bug.cgi?id=1353563
https://github.com/sischkg/xfer-limit/blob/master/README.md
https://kb.isc.org/article/AA-01390
https://kb.isc.org/article/AA-01390/169/CVE-2016-6170
https://lists.dns-oarc.net/pipermail/dns-operations/2016-July/015058.html
https://lists.dns-oarc.net/pipermail/dns-operations/2016-July/015073.html
https://lists.dns-oarc.net/pipermail/dns-operations/2016-July/015075.html
https://security.gentoo.org/glsa/201610-07
http://www.openwall.com/lists/oss-security/2016/07/06/3

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