Malformed NSEC records can cause named to terminate unexpectedly when synth-from-dnssec is enabled
Published Jun 21, 2023
7.5
HIGHCVSS 3.1
EPSS 0.88%
Description
A `named` instance configured to run as a DNSSEC-validating recursive resolver with the Aggressive Use of DNSSEC-Validated Cache (RFC 8198) option (`synth-from-dnssec`) enabled can be remotely terminated using a zone with a malformed NSEC record. This issue affects BIND 9 versions 9.16.8-S1 through 9.16.41-S1 and 9.18.11-S1 through 9.18.15-S1.
Affected products
-
- Version 9.16.8-S1StatusaffectedConstraints<=9.16.41-S1
- Version 9.18.11-S1StatusaffectedConstraints<=9.18.15-S1
- Version
Configuration 1
Configuration 2
- n/a
Configuration 3
- n/a
Configuration 4
- n/a
Configuration 5
- n/a
Configuration 6
- n/a
Configuration 7
- n/a
No data.
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 8
bind9.16
Not affected
Red Hat Enterprise Linux 9
bind
Not affected
Red Hat Enterprise Linux 9
dhcp
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| 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 8 | bind9.16 | Not affected | n/a |
| Red Hat Enterprise Linux 9 | 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: 9.16.42-S1 or 9.18.16-S1.
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
YesTechnical Impact
PartialDecision
n/aAssessed Dec 6, 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
2023–2026- 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 | 0.88% (0.00875) | 57.48th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.79% (0.00789) | 51.27th | v5 (v2026.06.15) |
| Mar 30, 2025 | 0.48% (0.00483) | 62.46th | v4 (v2025.03.14) |
| Mar 29, 2025 | 1.96% (0.01961) | 72.60th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.48% (0.00483) | 63.19th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.09% (0.00094) | 41.55th | v3 (v2023.03.01) |
| Jun 27, 2024 | 0.08% (0.00076) | 32.70th | v3 (v2023.03.01) |
| May 21, 2024 | 0.06% (0.00063) | 26.93th | v3 (v2023.03.01) |
| Jul 4, 2023 | 0.04% (0.00044) | 10.95th | v3 (v2023.03.01) |
| Jun 22, 2023 | 0.05% (0.00046) | 13.97th | v3 (v2023.03.01) |
No CWE recorded.
References (6)
- https://access.redhat.com/security/cve/CVE-2023-2829 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2216581 Issue Tracking
- https://kb.isc.org/docs/cve-2023-2829 vendor-advisoryVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2023-2829
- https://security.netapp.com/advisory/ntap-20230703-0010/ Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2023-2829
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2023-2829 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2216581 | Issue Tracking | |
| https://kb.isc.org/docs/cve-2023-2829 | vendor-advisoryVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2023-2829 | ||
| https://security.netapp.com/advisory/ntap-20230703-0010/ | Third Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2023-2829 |
Change history (0)
No recorded changes yet.