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Status published
High
CVE-2021-3297
On Zyxel NBG2105 V1.00(AAGU.2)C0 devices, setting the login cookie to...
Vulnerability Description
On Zyxel NBG2105 V1.00(AAGU.2)C0 devices, setting the login cookie to 1 provides administrator access.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
No credits recorded in the NVD database.
References
- https://www.zyxel.com/us/en/support/security_advisories.shtml
- https://www.zyxel.com/support/SupportLandingSR.shtml?c=gb&l=en&kbid=M-01490&md=NBG2105
- https://github.com/nieldk/vulnerabilities/blob/main/zyxel%20nbg2105/Admin%20bypass
- https://codeberg.org/nieldk/vulnerabilities/src/branch/main/zyxel%20nbg2105/Admin%20bypass
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Affected Vendor
zyxel
View all reports →Affected Software
nbg2105 firmware
Vulnerable Versions:
v1.00\(aagu.2\)c0
Timeline
Official Publish:
January 26th, 2021
Last Modified:
November 25th, 2025
Added to House:
July 21st, 2026
CVSS Vectors
V3:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weaknesses (CWE)
No CWE data available
MITRE ATT&CK TTPs
No associated TTPs found for this vulnerability.