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CVE-2023-2829

Malformed NSEC records can cause named to terminate unexpectedly when synth-from-dnssec is enabled

HIGH
7.5
CVSS Score
Published: June 21, 2023 at 04:26 PM UTC
Updated: October 24, 2026 at 07:10 PM UTC
7 products affected across 2 vendorsActive IQ Unified ManagerH700S FirmwareH300S Firmware· also runs on 5 platforms

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Severity
HIGH7.5
Exploit prediction
EPSS 0.9%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

BIND· Isc
95%
9.16.8 ≤ v ≤ 9.16.419.18.11 ≤ v ≤ 9.18.159.16.8-S19.18.11-S1
Active IQ Unified Manager· NetAppnpm
95%
All versions
H300S Firmware· NetAppdrupal
95%
All versions
netapp-h300s (same device)
H410C Firmware· NetAppdrupal
95%
All versions
netapp-h410c (same device)
H410S Firmware· NetAppdrupal
95%
All versions
netapp-h410s (same device)
H500S Firmware· NetAppdrupal
95%
All versions
netapp-h500s (same device)
H700S Firmware· NetAppdrupal
95%
All versions
netapp-h700s (same device)

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: [email protected]
https://kb.isc.org/docs/cve-2023-2829
Third Party Advisory
Source: [email protected]
https://security.netapp.com/advisory/ntap-20230703-0010/

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHisc
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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