Vulnerability Monitor

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CVE-2021-3297

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

Published

2021-01-26T18:16:29.770

Last Modified

2025-11-25T18:15:48.173

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.8 (HIGH)

CVSSv2 Vector

AV:L/AC:L/Au:N/C:C/I:C/A:C

Access Vector: LOCAL
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: COMPLETE
Integrity Impact: COMPLETE
Availability Impact: COMPLETE

Exploitability Score

3.9

Impact Score

10.0

Weaknesses

Type: Primary
CWE-287

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	zyxel	nbg2105_firmware	v1.00\(aagu.2\)c0	Yes
Hardware	zyxel	nbg2105	-	No

References

https://codeberg.org/nieldk/vulnerabilities/src/branch/main/zyxel%20nbg2105/Admin%20bypass ([email protected])
https://github.com/nieldk/vulnerabilities/blob/main/zyxel%20nbg2105/Admin%20bypass Exploit, Third Party Advisory ([email protected])
https://www.zyxel.com/support/SupportLandingSR.shtml?c=gb&l=en&kbid=M-01490&md=NBG2105 Product, Vendor Advisory ([email protected])
https://www.zyxel.com/us/en/support/security_advisories.shtml Vendor Advisory ([email protected])
https://github.com/nieldk/vulnerabilities/blob/main/zyxel%20nbg2105/Admin%20bypass Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.zyxel.com/support/SupportLandingSR.shtml?c=gb&l=en&kbid=M-01490&md=NBG2105 Product, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.zyxel.com/us/en/support/security_advisories.shtml Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)