CVE-2021-3297

On Zyxel NBG2105 V1.00(AAGU.2)C0 devices, setting the login cookie to 1 provides administrator access.

CVSS v3.1 NVD

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

CVSS v2.0 NVD

7.2 HIGHAV:L/AC:L/Au:N/C:C/I:C/A:C

EPSS

20.51% chance of exploitation in the next 30 days, 97th percentile

Nuclei

high · CWE-287

Published

2021-01-26

Updated

2025-11-25

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-3297.yaml

Exploit collections (2)

• Zyxel NBG2105 身份验证绕过（CVE-2021-3297）.mdtzwlhack/Vulnerability
• CVE-2021-3297.yamlzan8in/afrog

Security advisories

• https://www.zyxel.com/support/SupportLandingSR.shtml?c=gb&l=en&kbid=M-01490&md=NBG2105
• https://www.zyxel.com/us/en/support/security_advisories.shtml
• nieldk/vulnerabilities/blob/main/zyxel%20nbg2105/Admin%20bypass

References

• CVE Record
• NVD entry