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VulnerabilityPublished Updated

CVE-2024-29972: Zyxel NAS326 firmware · OS Command Injection

Affects Zyxel NAS326 firmwareSource CVE Database V5

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Public exploit available · 90% EPSS · CVSS 9.8 Critical · patch available : patch Zyxel NAS326 firmware as a priority.

Data as of 4 Nov 2026, 00:13 UTC

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (Zyxel)CVSS 3.19.8
EPSS
90.3% chance of exploitation in 30 days – higher than 99% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CISA SSVC
Exploitation
Proof of concept is public or traded
Automatable
Attackers can reliably automate steps 1–4 of the kill chain
Technical impact
Total control over the software or total information disclosure

CISA SSVC assessment, 2024-06-26.

Patch
Available
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

  1. Disclosed: evidence found.

    CVE published 4 Jun 2024

  2. Weaponized: evidence found.

    CISA SSVC: proof of concept public

  3. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  4. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

Timeline

  1. CVE ID reserved

    by Zyxel Corporation

    , 74 days before disclosure

  2. CVE published

    on cve.org

    , t = 0

  3. CISA SSVC assessment

    proof of concept public

    , 22 days after disclosure

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA SSVC, the Metasploit, Exploit-DB and nuclei-templates index as of 3 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
ZyxelNAS326 firmwareAffected
  • =< V5.21(AAZF.17)C0
Fixed in–
ZyxelNAS542 firmwareAffected
  • =< V5.21(ABAG.14)C0
Fixed in–

AI-suggested

A patch is available from Zyxel for this vulnerability. Users should upgrade NAS326 firmware to version V5.21(AAZF.17)C0 or later, and NAS542 firmware to version V5.21(ABAG.14)C0 or later to remediate this issue. Since this is a cloud-managed service, Zyxel manages remediation for the cloud-hosted components. No other mitigations are specified.

Description

** 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.

References

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