Critical severity9.8CISA KEVNVD Advisory· Published Dec 22, 2020· Updated Jun 17, 2026
CVE-2020-29583
CVE-2020-29583
Description
Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with an unchangeable password. The password for this account can be found in cleartext in the firmware. This account can be used by someone to login to the ssh server or web interface with admin privileges.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
32- cpe:2.3:o:zyxel:atp100_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:atp100w_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:atp200_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:atp500_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:atp700_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:atp800_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg1100_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg110_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg1900_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg20-vpn_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg20w-vpn_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg210_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg2200_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg310_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg40_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg40w_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg60_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg60w_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg_flex_100_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg_flex_100w_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg_flex_200_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg_flex_500_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg_flex_700_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:vpn1000_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:vpn100_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:vpn300_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:vpn50_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:zywall1100_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:zywall110_firmware:4.60:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:zywall310_firmware:4.60:*:*:*:*:*:*:*
- Zyxel/USGdescription
Patches
Vulnerability mechanics
References
8- www.secpod.com/blog/a-secret-zyxel-firewall-and-ap-controllers-could-allow-for-administrative-access-cve-2020-29583/nvdExploitThird Party Advisory
- www.eyecontrol.nl/blog/undocumented-user-account-in-zyxel-products.htmlnvdBroken LinkThird Party Advisory
- www.zyxel.com/support/CVE-2020-29583.shtmlnvdVendor Advisory
- www.zyxel.com/support/security_advisories.shtmlnvdVendor Advisory
- ftp.zyxel.com/USG40/firmware/USG40_4.60%28AALA.1%29C0_2.pdfnvdBroken Link
- businessforum.zyxel.com/discussion/5252/zld-v4-60-revoke-and-wk48-firmware-releasenvdRelease Notes
- businessforum.zyxel.com/discussion/5254/whats-new-for-zld4-60-patch-1-available-on-dec-15nvdRelease Notes
- www.cisa.gov/known-exploited-vulnerabilities-catalognvdUS Government Resource
News mentions
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