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Vulnerability record · CVE-2024-29976 · published 4 June 2024

CVE-2024-29976: Zyxel nas326 firmware improper privilege management vulnerability

Zyxel · Nas326 Firmware

** UNSUPPORTED WHEN ASSIGNED ** The improper privilege management vulnerability in the command “show_allsessions” in Zyxel NAS326 firmware versions before V5.21(AAZF.17)C0 and NAS542 firmware versions before V5.21(ABAG.14)C0 could allow an authenticated attacker to obtain a logged-in administrator’s session information containing cookies on an affected device.

6.5 CVSS 3.1 Medium EPSS 9.0% · top 4.9% CWE-269 · Improper privilege management
6.5CVSS 3.1 base score
9.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

** UNSUPPORTED WHEN ASSIGNED ** The improper privilege management vulnerability in the command “show_allsessions” in Zyxel NAS326 firmware versions before V5.21(AAZF.17)C0 and NAS542 firmware versions before V5.21(ABAG.14)C0 could allow an authenticated attacker to obtain a logged-in administrator’s session information containing cookies on an affected device.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://outpost24.com/blog/zyxel-nas-critical-vulnerabilities/ ExploitThird Party Advisory
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-nas- Vendor Advisory
https://outpost24.com/blog/zyxel-nas-critical-vulnerabilities/ ExploitThird Party Advisory
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-nas- Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-27992Zyxel NAS devices pre-auth OS command injectionZyxel NAS326, NAS540 and NAS542 firmware contain a pre-authentication OS command injection flaw (CWE-78). A crafted HTTP request lets an unauthentica…KEVEPSS 83%analysed9.8CVE-2020-9054ZyXEL NAS weblogin.cgi pre-auth command injectionZyXEL NAS devices running firmware 5.21 fail to sanitize the username parameter in the weblogin.cgi CGI executable, allowing OS command injection. Be…KEVEPSS 100%analysed9.8CVE-2024-6342Zyxel nas326 firmware os command injection vulnerability**UNSUPPORTED WHEN ASSIGNED** A command injection vulnerability in the export-cgi program of Zyxel NAS326 firmware versions through V5.21(AAZF.18)C0 …EPSS 2.1%9.8CVE-2024-29973Zyxel NAS setCookie parameter OS command injectionZyxel NAS326 and NAS542 firmware contain an OS command injection flaw in the setCookie parameter, reachable via a crafted HTTP POST request. The affe…EPSS 86%analysed9.8CVE-2024-29974Zyxel nas326 firmware unrestricted file upload vulnerability** UNSUPPORTED WHEN ASSIGNED ** The remote code execution vulnerability in the CGI program “file_upload-cgi” in Zyxel NAS326 firmware versions before…EPSS 23%9.8CVE-2024-29972Zyxel NAS remote_help-cgi unauthenticated OS command injectionThe remote_help-cgi CGI program in Zyxel NAS326 and NAS542 firmware mishandles input, allowing OS command injection via a crafted HTTP POST request. …EPSS 89%analysed9.8CVE-2023-4473Zyxel nas326 firmware os command injection vulnerabilityA command injection vulnerability in the web server of the Zyxel NAS326 firmware version V5.21(AAZF.14)C0 and NAS542 firmware version V5.21(ABAG.11)C…EPSS 41%9.8CVE-2023-4474Zyxel nas326 firmware os command injection vulnerabilityThe improper neutralization of special elements in the WSGI server of the Zyxel NAS326 firmware version V5.21(AAZF.14)C0 and NAS542 firmware version …EPSS 30%

Source: NIST National Vulnerability Database (record CVE-2024-29976), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.