CVE-2022-34747

9.8 criticalEPSS 1.8%

Critical (9.8) in zyxel nas326 firmware. EPSS 1.8% chance of exploitation in the next 30 days.

A format string vulnerability in Zyxel NAS326 firmware versions prior to V5.21(AAZF.12)C0 could allow an attacker to achieve unauthorized remote code execution via a crafted UDP packet.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 1.8% chance of exploitation in the next 30 days; higher than 78% of CVEs (scores of 2026-10-31)
CWE: CWE-134
Published: 2022-09-06
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

zyxel:nas326_firmware

References

https://www.zyxel.com/support/Zyxel-security-advisory-for-format-string-vulnerability-in-NAS.shtml
https://www.zyxel.com/support/Zyxel-security-advisory-for-format-string-vulnerability-in-NAS.shtml

Check your stack JSON