# CVE-2024-29972: CVE-2024-29972

Status: published. Published: 2024-06-04. Updated: 2026-11-03.

** UNSUPPORTED WHEN ASSIGNED **
The command injection vulnerability in the CGI program "remote_help-cgi" in Zyxel NAS326 firmware versions before V5.21(AAZF.17)C0 and NAS542 firmware versions before V5.21(ABAG.14)C0 could allow an unauthenticated attacker to execute some operating system (OS) commands by sending a crafted HTTP POST request.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Zyxel / NAS326 firmware: < V5.21(AAZF.17)C0 (affected). Source: CNA: Zyxel
- Zyxel / NAS542 firmware: < V5.21(ABAG.14)C0 (affected). Source: CNA: Zyxel
- zyxel / nas326_firmware: ≥ 0; < v5.21\(aazf.17\)co (affected, custom). Source: ADP: CISA-ADP
- zyxel / nas542_firmware: ≥ 0; < 5.21\(abag.14\)co (affected, custom). Source: ADP: CISA-ADP

## NVD configuration conditions

Affected CPE matches depend on the following AND/OR and negation conditions:

```json
[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:zyxel:nas326_firmware:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "5.21\\(aazf.17\\)c0",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      },
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:h:zyxel:nas326:-:*:*:*:*:*:*:*",
            "vulnerable": false
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "AND"
  },
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:zyxel:nas542_firmware:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "5.21\\(abag.14\\)c0",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      },
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:h:zyxel:nas542:-:*:*:*:*:*:*:*",
            "vulnerable": false
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "AND"
  }
]
```

## Severity and prioritization

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: CNA: Zyxel

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: NVD: security@zyxel.com.tw

- CISA KEV: No listing in collected sources

- EPSS: 90.35% as of 2026-11-03; percentile 99.80%

- SSVC: exploitation poc; automatable yes; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-78

## Exploit evidence

- exploit: https://outpost24.com/blog/zyxel-nas-critical-vulnerabilities/ (security@zyxel.com.tw)
- exploit: https://outpost24.com/blog/zyxel-nas-critical-vulnerabilities/ (af854a3a-2127-422b-91ae-364da2661108)

## References

- https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-nas-products-06-04-2024 (CNA: Zyxel; vendor-advisory)

- https://outpost24.com/blog/zyxel-nas-critical-vulnerabilities/ (CNA: Zyxel)

- https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-nas-products-06-04-2024 (ADP: CVE; vendor-advisory, x_transferred)

- https://outpost24.com/blog/zyxel-nas-critical-vulnerabilities/ (ADP: CVE; x_transferred)

- https://outpost24.com/blog/zyxel-nas-critical-vulnerabilities/ (security@zyxel.com.tw; Exploit, Third Party Advisory)

- https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-nas-products-06-04-2024 (security@zyxel.com.tw; Vendor Advisory)

- https://outpost24.com/blog/zyxel-nas-critical-vulnerabilities/ (af854a3a-2127-422b-91ae-364da2661108; Exploit, Third Party Advisory)

- https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-nas-products-06-04-2024 (af854a3a-2127-422b-91ae-364da2661108; Vendor Advisory)

## Provenance

- CNA: Zyxel: https://www.cve.org/CVERecord?id=CVE-2024-29972; retrieved 2026-11-04; source updated 2026-11-03

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-29972; retrieved 2026-11-04; source updated 2026-11-03

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2024-29972; retrieved 2026-11-03; source updated Not reported

Revision: 12d2d5a267eff29535e41df557c7ceacc7ec199f1adb8934bda1a5bdaed8328a

Canonical: https://y2.dev/cve/CVE-2024-29972

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