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Vulnerability record · CVE-2016-6170 · published 6 July 2016

CVE-2016-6170: Isc bind improper input validation vulnerability

Isc · Bind

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.

6.5 CVSS 3.1 Medium EPSS 41% · top 1.4% CWE-20 · Improper input validation
6.5CVSS 3.1 base score, v2 4.0
41%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
22References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

Track CVE-2016-6170 inside VULONE

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Source: NIST National Vulnerability Database (record CVE-2016-6170), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.