A flaw in the "deny-answer-aliases" feature can cause an assertion failure in named
"deny-answer-aliases" is a little-used feature intended to help recursive server operators protect end users against DNS rebinding attacks, a potential method of circumventing the security model used by client browsers. However, a defect in this feature makes it easy, when the feature is in use, to experience an assertion failure in name.c. Affects BIND 9.7.0->9.8.8, 9.9.0->9.9.13, 9.10.0->9.10.8, 9.11.0->9.11.4, 9.12.0->9.12.2, 9.13.0->9.13.2.
- Published
- Jan 16, 2019
- Updated
- Jun 16, 2026
- EPSS
- 59.6% · 99th percentile
- CWE
- CWE-617
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Report tools
Action score
48
Plan
Add it to your regular patch cycle.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 18 / 30 · 59.6%
CNA vs NVD score
- NVD
- 7.5
- CNA · isc
- 7.5
- agree
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| isc | bind | cpe:2.3:a:isc:bind |
| redhat | enterprise linux desktop | cpe:2.3:o:redhat:enterprise_linux_desktop |
| redhat | enterprise linux server | cpe:2.3:o:redhat:enterprise_linux_server |
| redhat | enterprise linux server aus | cpe:2.3:o:redhat:enterprise_linux_server_aus |
| redhat | enterprise linux server eus | cpe:2.3:o:redhat:enterprise_linux_server_eus |
| redhat | enterprise linux workstation | cpe:2.3:o:redhat:enterprise_linux_workstation |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| netapp | data ontap edge | cpe:2.3:a:netapp:data_ontap_edge |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
| hp | hp-ux | cpe:2.3:o:hp:hp-ux |
| opensuse | leap | cpe:2.3:o:opensuse:leap |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- canonical ubuntu linux12.04
- canonical ubuntu linux14.04
- canonical ubuntu linux16.04
- canonical ubuntu linux18.04
- debian debian linux8.0
- debian debian linux9.0
- hp hp-uxall versions
- isc bind9.9.0 and later · before 9.9.13
- isc bind9.11.0 and later · before 9.11.4
- isc bind9.10.0 and later · before 9.10.8
- isc bind9.7.0 and later · before 9.8.8
- isc bind9.13.0 and later · before 9.13.2
- isc bind9.12.0 and later · before 9.12.2
- netapp data ontap edgeall versions
- opensuse leap15.0
- opensuse leap15.1
- opensuse leap42.3
- redhat enterprise linux desktop6.0
- redhat enterprise linux desktop7.0
- redhat enterprise linux server6.0
Versions reported by the vendor
Affected version ranges reported by the assigning authority (isc). Independent of NVD's CPE analysis and usually ahead of it.
ISC BIND 9
- BIND 9 9.7.0->9.8.8, 9.9.0->9.9.13, 9.10.0->9.10.8, 9.11.0->9.11.4, 9.12.0->9.12.2, 9.13.0->9.13.2affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.10 | bind | from 9.7.0 · before 9.12.2_p1-r0 | 9.12.2_p1-r0 |
| Alpine:v3.5 | bind | from 9.7.0 · before 9.10.8_p1-r0 | 9.10.8_p1-r0 |
| Alpine:v3.6 | bind | from 9.7.0 · before 9.11.4_p1-r0 | 9.11.4_p1-r0 |
| Debian:12 | bind9 | before 1:9.11.4.P1+dfsg-1 | 1:9.11.4.P1+dfsg-1 |
| Debian:8 | bind9 | before 1:9.9.5.dfsg-9+deb8u16 | 1:9.9.5.dfsg-9+deb8u16 |
| Debian:9 | bind9 | before 1:9.10.3.dfsg.P4-12.3+deb9u10 | 1:9.10.3.dfsg.P4-12.3+deb9u10 |
| openSUSE:Leap 15.0 | bind | before 9.11.2-lp151.11.3.1 | 9.11.2-lp151.11.3.1 |
| Red Hat:enterprise_linux:6::client | bind | before 32:9.8.2-0.68.rc1.el6_10.1 | 32:9.8.2-0.68.rc1.el6_10.1 |
| Red Hat:enterprise_linux:6::client | bind-chroot | before 32:9.8.2-0.68.rc1.el6_10.1 | 32:9.8.2-0.68.rc1.el6_10.1 |
| Red Hat:enterprise_linux:6::client | bind-debuginfo | before 32:9.8.2-0.68.rc1.el6_10.1 | 32:9.8.2-0.68.rc1.el6_10.1 |
| Red Hat:enterprise_linux:6::client | bind-devel | before 32:9.8.2-0.68.rc1.el6_10.1 | 32:9.8.2-0.68.rc1.el6_10.1 |
| Red Hat:enterprise_linux:6::client | bind-libs | before 32:9.8.2-0.68.rc1.el6_10.1 | 32:9.8.2-0.68.rc1.el6_10.1 |
| Red Hat:enterprise_linux:6::client | bind-sdb | before 32:9.8.2-0.68.rc1.el6_10.1 | 32:9.8.2-0.68.rc1.el6_10.1 |
| Red Hat:enterprise_linux:6::client | bind-utils | before 32:9.8.2-0.68.rc1.el6_10.1 | 32:9.8.2-0.68.rc1.el6_10.1 |
| Red Hat:enterprise_linux:7::client | bind | before 32:9.9.4-61.el7_5.1 | 32:9.9.4-61.el7_5.1 |
| Red Hat:enterprise_linux:7::client | bind-chroot | before 32:9.9.4-61.el7_5.1 | 32:9.9.4-61.el7_5.1 |
| Red Hat:enterprise_linux:7::client | bind-debuginfo | before 32:9.9.4-61.el7_5.1 | 32:9.9.4-61.el7_5.1 |
| Red Hat:enterprise_linux:7::client | bind-devel | before 32:9.9.4-61.el7_5.1 | 32:9.9.4-61.el7_5.1 |
| Red Hat:enterprise_linux:7::client | bind-libs | before 32:9.9.4-61.el7_5.1 | 32:9.9.4-61.el7_5.1 |
| Red Hat:enterprise_linux:7::client | bind-libs-lite | before 32:9.9.4-61.el7_5.1 | 32:9.9.4-61.el7_5.1 |
| Red Hat:enterprise_linux:7::client | bind-license | before 32:9.9.4-61.el7_5.1 | 32:9.9.4-61.el7_5.1 |
| Red Hat:enterprise_linux:7::client | bind-lite-devel | before 32:9.9.4-61.el7_5.1 | 32:9.9.4-61.el7_5.1 |
| Red Hat:enterprise_linux:7::client | bind-pkcs11 | before 32:9.9.4-61.el7_5.1 | 32:9.9.4-61.el7_5.1 |
| Red Hat:enterprise_linux:7::client | bind-pkcs11-devel | before 32:9.9.4-61.el7_5.1 | 32:9.9.4-61.el7_5.1 |
+9
Same product
isc: all recordsOther highest-scoring records for the same primary product.
- CVE-2015-5477named in ISC BIND 9.x before 9.9.7-P2 and 9.10.x before 9.10.2-P3 allows remote attackers to cause a denial of service (REQUIRE assertion fa58Plan
- CVE-2016-2776buffer.c in named in ISC BIND 9 before 9.9.9-P3, 9.10.x before 9.10.4-P3, and 9.11.x before 9.11.0rc3 does not properly construct responses,57Plan
- CVE-2016-1286named in ISC BIND 9.x before 9.9.8-P4 and 9.10.x before 9.10.3-P4 allows remote attackers to cause a denial of service (assertion failure an53Plan
- CVE-2020-8625A vulnerability in BIND's GSSAPI security policy negotiation can be targeted by a buffer overflow attack51Plan
- CVE-2020-8617A logic error in code which checks TSIG validity can be used to trigger an assertion failure in tsig.c51Plan
- CVE-2001-0010Buffer overflow in transaction signature (TSIG) handling code in BIND 8 allows remote attackers to gain root privileges.49Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Alpine:bind | 9.12.2_p1-r0 · Alpine:v3.10 | Package registry (OSV) |
| Debian:bind9 | 1:9.11.4.P1+dfsg-1 · Debian:12 | Package registry (OSV) |
| openSUSE:bind | 9.11.2-lp151.11.3.1 · openSUSE:Leap 15.0 | Package registry (OSV) |
| Red Hat:bind | 32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| Red Hat:bind-chroot | 32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| Red Hat:bind-debuginfo | 32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| Red Hat:bind-devel | 32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| Red Hat:bind-libs | 32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| Red Hat:bind-libs-lite | 32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| Red Hat:bind-license | 32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| Red Hat:bind-lite-devel | 32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| Red Hat:bind-pkcs11 | 32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| Red Hat:bind-pkcs11-devel | 32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| Red Hat:bind-pkcs11-libs | 32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| Red Hat:bind-utils | 32:9.9.4-61.el7_5.1 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| SUSE:bind | 9.11.2-12.11.2 · SUSE:Linux Enterprise Module for Basesystem 15 | Package registry (OSV) |
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Proof-of-concept repository on GitHub ×1
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Proof-of-concept repository on GitHub | stars:3 | 2018-08-15 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- First PoC-155 d
- Published
- TodaySep 29, 2026+2813 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-617 · Reachable AssertionCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- lists.opensuse.org/opensuse-security-announce/2019-06/msg00026.html
- lists.opensuse.org/opensuse-security-announce/2019-06/msg00027.html
- www.securityfocus.com/bid/105055
- www.securitytracker.com/id/1041436
- access.redhat.com/errata/RHSA-2018:2570
- access.redhat.com/errata/RHSA-2018:2571
- kb.isc.org/docs/aa-01639
- lists.debian.org/debian-lts-announce/2018/08/msg00033.html
- lists.debian.org/debian-lts-announce/2021/11/msg00001.html
- security.gentoo.org/glsa/201903-13
- security.netapp.com/advisory/ntap-20180926-0003/
- support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03927en_us
- usn.ubuntu.com/3769-1/
- usn.ubuntu.com/3769-2/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.