Zyxel Multiple Products Use of Hard-Coded Credentials Vulnerability (CVE-2020-29583)
Severity: critical · Patch status: patched · Since 2021-11-03 · CVE-2020-29583
Zyxel firewalls (ATP, USG, VM) and AP Controllers (NXC2500 and NXC5500) contain a use of hard-coded credentials vulnerability in an undocumented account ("zyfwp") with an unchangeable password. CISA added CVE-2020-29583 to its Known Exploited Vulnerabilities catalog on Nov 3, 2021, which means attackers are exploiting it in the wild.
What to do
- Apply updates per vendor instructions.
- US federal agencies must remediate by May 3, 2022 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch
