TI-2024-19739 Aliases CVE-2024-29976 GHSA-f5mr-vq5h-37xc

Improper privilege management in Zyxel NAS326 firmware

MEDIUM 42CWE-269Published 2024-06-04 · Updated 2024-08-02

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Privilege escalation
Confidentiality · integrity · availability: High · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-269.

Summary

** 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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.08954 95th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed NAS326 firmware (Zyxel): V5.21(AAZF.17)C0NAS542 firmware (Zyxel): V5.21(ABAG.14)C0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Zyxel	NAS326 firmware	before V5.21(AAZF.17)C0	V5.21(AAZF.17)C0	Patch available	CNA
Zyxel	NAS542 firmware	before V5.21(ABAG.14)C0	V5.21(ABAG.14)C0	Patch available	CNA

NAS326 firmware VendorZyxel Affected before V5.21(AAZF.17)C0 Fixed in V5.21(AAZF.17)C0 Patch available CNA
NAS542 firmware VendorZyxel Affected before V5.21(ABAG.14)C0 Fixed in V5.21(ABAG.14)C0 Patch available CNA

CPE configurations NVD · 4

CPE	Versions	Role	Vendor
cpe:2.3:o:zyxel:nas326_firmware::::::::	before 5.21\(aazf.17\)c0	Vulnerable	Zyxel
cpe:2.3:h:zyxel:nas326:-:::::::*	not specified by NVD	Running on	Zyxel
cpe:2.3:o:zyxel:nas542_firmware::::::::	before 5.21\(abag.14\)c0	Vulnerable	Zyxel
cpe:2.3:h:zyxel:nas542:-:::::::*	not specified by NVD	Running on	Zyxel

cpe:2.3:o:zyxel:nas326_firmware:*:*:*:*:*:*:*:* Versions before 5.21\(aazf.17\)c0 Vulnerable ·Zyxel
cpe:2.3:h:zyxel:nas326:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
cpe:2.3:o:zyxel:nas542_firmware:*:*:*:*:*:*:*:* Versions before 5.21\(abag.14\)c0 Vulnerable ·Zyxel
cpe:2.3:h:zyxel:nas542:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel

Remediation

Fix · CNA NAS326 firmware (Zyxel) Fixed in V5.21(AAZF.17)C0
Fix · CNA NAS542 firmware (Zyxel) Fixed in V5.21(ABAG.14)C0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Advisory · 2024-06-04
Zyxel NAS326 firmware, NAS542 firmware — zyxel.com/global/en/support/security-advisories/zyxel-secur…
5 records Highest priority Priority CRITICAL 2 CRITICAL, 1 HIGH, 1 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2024-19735 OS command injection in Zyxel NAS326 firmwarePriority CRITICAL 92
- TI-2024-19736 OS command injection in Zyxel NAS326 firmwarePriority CRITICAL 91
- TI-2024-19737 Unrestricted file upload in Zyxel NAS326 firmwarePriority HIGH 69
Show all 5 records → Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2024-29976
2026-10-03 Alias added: GHSA-f5mr-vq5h-37xc

References

Exploit 1

https://outpost24.com/blog/zyxel-nas-critical-vulnerabilities/

Advisory 1

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-nas-products-06-04-2024

TI-2023-12582 OS command injection in Zyxel NAS326 firmware KEVCVSS 3.1CRITICAL 9.8
TI-2020-07267 OS command injection in Zyxel NAS326 KEVCVSS 3.1CRITICAL 9.8
TI-2024-19735 OS command injection in Zyxel NAS326 firmware CVSS 3.1CRITICAL 9.8
TI-2024-19736 OS command injection in Zyxel NAS326 firmware CVSS 3.1CRITICAL 9.8
TI-2023-04130 OS command injection in Zyxel NAS326 firmware CVSS 3.1CRITICAL 9.8
TI-2023-04129 OS command injection in Zyxel NAS326 firmware CVSS 3.1CRITICAL 9.8

See all 23 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences