CVE-2016-2775

CVE-2016-2775 is a medium-severity vulnerability in Isc Bind with a CVSS 3.x base score of 5.9. Its EPSS exploit-prediction score of 63% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-20.

Key facts

• Severity: Medium (CVSS 3.x base score 5.9)
• CVSS v2: 4.3
• EPSS exploit prediction: 63% (99th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-20
• Affected product: Isc Bind
• Published: 2016-07-19
• Last modified: 2026-06-17

Description

ISC BIND 9.x before 9.9.9-P2, 9.10.x before 9.10.4-P2, and 9.11.x before 9.11.0b2, when lwresd or the named lwres option is enabled, allows remote attackers to cause a denial of service (daemon crash) via a long request that uses the lightweight resolver protocol.

Frequently asked questions

What is CVE-2016-2775?

ISC BIND 9.x before 9.9.9-P2, 9.10.x before 9.10.4-P2, and 9.11.x before 9.11.0b2, when lwresd or the named lwres option is enabled, allows remote attackers to cause a denial of service (daemon crash) via a long request that uses the lightweight resolver protocol.

How severe is CVE-2016-2775?

CVE-2016-2775 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2016-2775 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 63% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-2775?

CVE-2016-2775 primarily affects Isc Bind. In total, 41 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-2775?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2016-2775 published?

CVE-2016-2775 was published on 2016-07-19 and last updated on 2026-06-17.

References

• http://www.securityfocus.com/bid/92037
• http://www.securitytracker.com/id/1036360
• https://access.redhat.com/errata/RHBA-2017:0651
• https://access.redhat.com/errata/RHBA-2017:1767
• https://access.redhat.com/errata/RHSA-2017:2533
• https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05321107
• https://kb.isc.org/article/AA-01393/74/CVE-2016-2775
• https://kb.isc.org/article/AA-01435
• https://kb.isc.org/article/AA-01436
• https://kb.isc.org/article/AA-01438
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7T2WJP5ELO4ZRSBXSETIZ3GAO6KOEFTA/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MZUCSMEOZIZ2R2SKA4FPLTOVZHJBAOWC/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NJ5STNEUHBNEPUHJT7CYEVSMATFYMIX7/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TT754KDUJTKOASJODJX7FKHCOQ6EC7UX/
• https://security.gentoo.org/glsa/201610-07
• https://security.netapp.com/advisory/ntap-20160722-0002/

Affected products (41)

• cpe:2.3:o:hp:hp-ux:b.11.31:*:*:*:*:*:*:*
• cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*
• cpe:2.3:a:isc:bind:9.9.9:-:*:*:*:*:*:*
• cpe:2.3:a:isc:bind:9.9.9:b1:*:*:*:*:*:*
• cpe:2.3:a:isc:bind:9.9.9:b2:*:*:*:*:*:*
• cpe:2.3:a:isc:bind:9.9.9:p1:*:*:*:*:*:*
• cpe:2.3:a:isc:bind:9.9.9:rc1:*:*:*:*:*:*
• cpe:2.3:a:isc:bind:9.9.9:s1:*:*:*:*:*:*
• cpe:2.3:a:isc:bind:9.9.9:s1rc1:*:*:*:*:*:*
• cpe:2.3:a:isc:bind:9.10.4:-:*:*:*:*:*:*
• cpe:2.3:a:isc:bind:9.10.4:beta1:*:*:*:*:*:*
• cpe:2.3:a:isc:bind:9.10.4:beta2:*:*:*:*:*:*
• cpe:2.3:a:isc:bind:9.10.4:beta3:*:*:*:*:*:*
• cpe:2.3:a:isc:bind:9.10.4:p1:*:*:*:*:*:*
• cpe:2.3:a:isc:bind:9.11.0:-:*:*:*:*:*:*
• cpe:2.3:a:isc:bind:9.11.0:alpha1:*:*:*:*:*:*
• cpe:2.3:a:isc:bind:9.11.0:alpha2:*:*:*:*:*:*
• cpe:2.3:a:isc:bind:9.11.0:alpha3:*:*:*:*:*:*
• cpe:2.3:a:isc:bind:9.11.0:beta1:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:23:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:24:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_eus:7.2:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_eus:7.3:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_eus:7.4:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_eus:7.5:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_eus:7.6:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_eus:7.7:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server_aus:7.2:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server_aus:7.7:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server_tus:7.2:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server_tus:7.3:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server_tus:7.7:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*

More vulnerabilities in Isc Bind

• CVE-2008-0122 — Critical (CVSS 10.0): Off-by-one error in the inet_network function in libbind in ISC BIND 9.4.2 and earlier, as used in libc in FreeBSD 6.2…
• CVE-2001-0011 — Critical (CVSS 10.0): Buffer overflow in nslookupComplain function in BIND 4 allows remote attackers to gain root privileges.
• CVE-2001-0013 — Critical (CVSS 10.0): Format string vulnerability in nslookupComplain function in BIND 4 allows remote attackers to gain root privileges.
• CVE-2001-0010 — Critical (CVSS 10.0): Buffer overflow in transaction signature (TSIG) handling code in BIND 8 allows remote attackers to gain root privileges.
• CVE-2000-1029 — Critical (CVSS 10.0): Buffer overflow in host command allows a remote attacker to execute arbitrary commands via a long response to an AXFR…
• CVE-1999-0837 — Critical (CVSS 10.0): Denial of service in BIND by improperly closing TCP sessions via so_linger.

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