Enabling both DNS64 and serve-stale may cause an assertion failure during recursive resolution
Published Feb 13, 2024
7.5
HIGHCVSS 3.1
EPSS 1.24%
Description
A bad interaction between DNS64 and serve-stale may cause `named` to crash with an assertion failure during recursive resolution, when both of these features are enabled. This issue affects BIND 9 versions 9.16.12 through 9.16.45, 9.18.0 through 9.18.21, 9.19.0 through 9.19.19, 9.16.12-S1 through 9.16.45-S1, and 9.18.11-S1 through 9.18.21-S1.
Affected products
-
- Version 9.16.12StatusaffectedConstraints<=9.16.45
- Version 9.16.12-S1StatusaffectedConstraints<=9.16.45-S1
- Version 9.18.0StatusaffectedConstraints<=9.18.21
- Version 9.18.11-S1StatusaffectedConstraints<=9.18.21-S1
- Version 9.19.0StatusaffectedConstraints<=9.19.19
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
Configuration 1
- n/a
- 38
- 39
Configuration 2
- ≥ 9.16.12 · ≤ 9.16.45
- ≥ 9.18.0 · ≤ 9.18.21
- ≥ 9.19.0 · ≤ 9.19.19
- 9.16.12
- 9.16.13
- 9.16.14
- 9.16.21
- 9.16.32
- 9.16.36
- 9.16.43
- 9.16.45
- 9.18.11
- 9.18.18
- 9.18.21
No data.
Red Hat Enterprise Linux 8
bind9.16-32:9.16.23-0.16.el8_9.2
Fixed · RHSA-2024:1781
Red Hat Enterprise Linux 8.6 Extended Update Support
bind9.16-32:9.16.23-0.7.el8_6.5
Fixed · RHSA-2024:1647
Red Hat Enterprise Linux 8.8 Extended Update Support
bind9.16-32:9.16.23-0.14.el8_8.4
Fixed · RHSA-2024:1648
Red Hat Enterprise Linux 9
bind-32:9.16.23-14.el9_3.4
Fixed · RHSA-2024:1789
Red Hat Enterprise Linux 9
bind-32:9.16.23-18.el9_4.1
Fixed · RHSA-2024:2551
Red Hat Enterprise Linux 9
bind-dyndb-ldap-0:11.9-8.el9_3.3
Fixed · RHSA-2024:1789
Red Hat Enterprise Linux 9
bind-dyndb-ldap-0:11.9-9.el9_4
Fixed · RHSA-2024:2551
Red Hat Enterprise Linux 9.0 Extended Update Support
bind-32:9.16.23-1.el9_0.5
Fixed · RHSA-2024:1800
Red Hat Enterprise Linux 9.0 Extended Update Support
bind-dyndb-ldap-0:11.9-7.el9_0.1
Fixed · RHSA-2024:1800
Red Hat Enterprise Linux 9.2 Extended Update Support
bind-32:9.16.23-11.el9_2.4
Fixed · RHSA-2024:1803
Red Hat Enterprise Linux 9.2 Extended Update Support
bind-dyndb-ldap-0:11.9-8.el9_2.2
Fixed · RHSA-2024:1803
Red Hat Enterprise Linux 6
bind
Not affected
Red Hat Enterprise Linux 7
bind
Not affected
Red Hat Enterprise Linux 8
bind
Not affected
Red Hat Enterprise Linux 9
dhcp
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 8 | bind9.16-32:9.16.23-0.16.el8_9.2 | Fixed | RHSA-2024:1781 |
| Red Hat Enterprise Linux 8.6 Extended Update Support | bind9.16-32:9.16.23-0.7.el8_6.5 | Fixed | RHSA-2024:1647 |
| Red Hat Enterprise Linux 8.8 Extended Update Support | bind9.16-32:9.16.23-0.14.el8_8.4 | Fixed | RHSA-2024:1648 |
| Red Hat Enterprise Linux 9 | bind-32:9.16.23-14.el9_3.4 | Fixed | RHSA-2024:1789 |
| Red Hat Enterprise Linux 9 | bind-32:9.16.23-18.el9_4.1 | Fixed | RHSA-2024:2551 |
| Red Hat Enterprise Linux 9 | bind-dyndb-ldap-0:11.9-8.el9_3.3 | Fixed | RHSA-2024:1789 |
| Red Hat Enterprise Linux 9 | bind-dyndb-ldap-0:11.9-9.el9_4 | Fixed | RHSA-2024:2551 |
| Red Hat Enterprise Linux 9.0 Extended Update Support | bind-32:9.16.23-1.el9_0.5 | Fixed | RHSA-2024:1800 |
| Red Hat Enterprise Linux 9.0 Extended Update Support | bind-dyndb-ldap-0:11.9-7.el9_0.1 | Fixed | RHSA-2024:1800 |
| Red Hat Enterprise Linux 9.2 Extended Update Support | bind-32:9.16.23-11.el9_2.4 | Fixed | RHSA-2024:1803 |
| Red Hat Enterprise Linux 9.2 Extended Update Support | bind-dyndb-ldap-0:11.9-8.el9_2.2 | Fixed | RHSA-2024:1803 |
| Red Hat Enterprise Linux 6 | bind | Not affected | n/a |
| Red Hat Enterprise Linux 7 | bind | Not affected | n/a |
| Red Hat Enterprise Linux 8 | bind | Not affected | n/a |
| Red Hat Enterprise Linux 9 | dhcp | Not affected | n/a |
No package ranges for this CVE.
Remediation
Vendor solution
Upgrade to the patched release most closely related to your current version of BIND 9: 9.16.48, 9.18.24, 9.19.21, 9.16.48-S1, or 9.18.24-S1.
Red Hat statement
The identified vulnerability in the BIND DNS server poses a important severity risk due to its potential to induce a Denial of Service (DoS) through a targeted exploitation of DNS64 functionality. Specifically, the flaw allows an attacker to send a crafted domain query that triggers a code assertion failure within the named process. This leads to a crash of the DNS server, disrupting its ability to resolve queries and maintain network operations. As a result, the DNS service becomes unavailable to legitimate users, impacting the integrity and availability of network services and potentially disrupting business operations or network communications. The exploitation of this vulnerability by an unauthenticated remote user underscores the urgent need for immediate patching and mitigation to safeguard DNS infrastructure against service outages.
Red Hat mitigation
This vulnerability can be mitigated by either disabled server-stale configuration, using both of the switches bellow in named configuration file: 1) set stale-cache-enable no; 2) set stale-answer-enable no; Alternatively, disable the DNS64 option. Both mitigations should make the affected code unreachable, making it impossible to an attacker to exploit this vulnerability.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Feb 13, 2024 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2024–2026- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.24% (0.01242) | 68.09th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.23% (0.01231) | 64.94th | v5 (v2026.06.15) |
| Mar 30, 2025 | 0.51% (0.00508) | 63.58th | v4 (v2025.03.14) |
| Mar 29, 2025 | 2.12% (0.02119) | 73.56th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.61% (0.00614) | 68.05th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.09% (0.00089) | 39.76th | v3 (v2023.03.01) |
| Apr 27, 2024 | 0.10% (0.00102) | 41.13th | v3 (v2023.03.01) |
| Mar 4, 2024 | 0.08% (0.00081) | 33.26th | v3 (v2023.03.01) |
| Feb 21, 2024 | 0.05% (0.00049) | 15.65th | v3 (v2023.03.01) |
| Feb 14, 2024 | 0.05% (0.00046) | 13.59th | v3 (v2023.03.01) |
References (11)
- http://www.openwall.com/lists/oss-security/2024/02/13/1 Mailing ListThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2023-5679 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2263909 Issue Tracking
- https://kb.isc.org/docs/cve-2023-5679 vendor-advisoryVendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/ Mailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/ Mailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/ Mailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/ Mailing ListThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2023-5679
- https://security.netapp.com/advisory/ntap-20240426-0002/ Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2023-5679
Change history (0)
No recorded changes yet.