What’s Vulnerable › Vulnerabilities
CVE-2021-3297
- Severity: high (CVSS 7.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 20.5% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2021-01-26 · updated 2026-06-17
- Weakness: CWE-287
Description
On Zyxel NBG2105 V1.00(AAGU.2)C0 devices, setting the login cookie to 1 provides administrator access.
Affected products
- Zyxel Nbg2105 Firmware: v1.00(aagu.2)c0
References
- https://codeberg.org/nieldk/vulnerabilities/src/branch/main/zyxel%20nbg2105/Admin%20bypass
- https://github.com/nieldk/vulnerabilities/blob/main/zyxel%20nbg2105/Admin%20bypass
- 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
- https://github.com/nieldk/vulnerabilities/blob/main/zyxel%20nbg2105/Admin%20bypass
- 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
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