CVE-2024-29972: Zyxel NAS326 firmware · OS Command Injection
Affects Zyxel NAS326 firmwareSource CVE Database V5
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
Thin evidence
One scorer or none| CNA (Zyxel) | CVSS 3.1 | 9.8 |
|---|
- 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:HExploitation evidence
t = 0 is the CVE’s publication on cve.org
Disclosed: evidence found.
CVE published 4 Jun 2024
Detectable: evidence found.
nuclei template: Zyxel NAS326 Firmware < V5.21(AAZF.17)C0 - NsaRescueAngel Backdoor Account
Weaponized: evidence found.
CISA SSVC: proof of concept public
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
Timeline
CVE ID reserved
by Zyxel Corporation
, 74 days before disclosure
CVE published
on cve.org
, t = 0
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
| Product | Affected | Fixed in |
|---|---|---|
| ZyxelNAS326 firmware | Affected
| Fixed in– |
| ZyxelNAS542 firmware | Affected
| 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.