# Cis Bind9 V301 7 3

> Disable the dnssec-accept-expired Option (Scored)

- Skill: `cyberstrikeus/cis-bind9-v301-7-3` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-bind9-v301-7-3`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-bind9-v301-7-3/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: cyberstrikeus (https://skillmd.com/u/cyberstrikeus)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/cyberstrikeus/cis-bind9-v301-7-3

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# CIS 7.3 — Disable the dnssec-accept-expired Option

## Profile Applicability

- Level 1 - Caching Only Name Server

## Description

The `dnssec-accept-expired` option allows BIND to accept expired signatures during validation. The option should be disabled so that expired signatures will not be accepted.

## Rationale

Allowing expired signatures would leave the server vulnerable to replay attacks.

## Impact

None noted.

## Audit Procedure

Verify the `dnssec-accept-expired` option is not present in the configuration files, or is set to a value of `no`.

```bash
# grep dnssec-accept-expired $INCLUDE_FILES
/var/named/chroot/etc/named.conf:    dnssec-accept-expired no;
```

## Remediation

Change the `dnssec-accept-expired` option to have a value of `no`, or remove the option from the configuration files.

## Default Value

The `dnssec-accept-expired` option is disabled by default.

## References

None listed.

## CIS Controls

| Controls Version | Control                                                              | IG 1 | IG 2 | IG 3 |
| ---------------- | -------------------------------------------------------------------- | ---- | ---- | ---- |
| v6               | 9 - Limitation and Control of Network Ports, Protocols, and Services | Y    | Y    | Y    |

## MITRE ATT&CK Mappings

| Tactic         | Technique                       |
| -------------- | ------------------------------- |
| Initial Access | T1557 - Adversary-in-the-Middle |
| Impact         | T1565 - Data Manipulation       |

## Profile

- Level 1 - Caching Only Name Server