OS command injection in Zyxel NAS326 firmware
Priority MEDIUM 56CWE-78Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-78.
Summary
The post-authentication command injection vulnerability in Zyxel NAS326 firmware versions through V5.21(AAZF.15)C0 and NAS542 firmware versions through V5.21(ABAG.12)C0 could allow an authenticated attacker with administrator privileges to execute some operating system (OS) commands by sending a crafted query parameter attached to the URL of an affected device’s web management interface.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.28472 98th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
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 | up to V5.21(AAZF.15)C0 | — | No fix listed | CNA |
| Zyxel | NAS542 firmware | up to V5.21(ABAG.12)C0 | — | No fix listed | CNA |
- NAS326 firmware VendorZyxel Affected up to V5.21(AAZF.15)C0 Fixed in — No fix listed CNA
- NAS542 firmware VendorZyxel Affected up to V5.21(ABAG.12)C0 Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:zyxel:nas326_firmware:*:*:*:*:*:*:*:* | before 5.21\(aazf.16\)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\(abag.13\)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\(aazf.16\)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\(abag.13\)c0 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:nas542:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2023-5372
- 2026-10-03 Alias added: GHSA-hgw6-wf28-c5x3
References
More Zyxel Nas326 Firmware vulnerabilities
- 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
Sources
- CVE-2023-5372 · CVE Program
- CVE-2023-5372 · NVD
- FIRST EPSS
- GHSA-hgw6-wf28-c5x3 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences