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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.

Basic Information

CVE State
PUBLISHED
Reserved Date
January 25, 2021
Published Date
January 26, 2021
Last Updated
November 25, 2025
Vendor
n/a
Product
n/a
Description
On Zyxel NBG2105 V1.00(AAGU.2)C0 devices, setting the login cookie to 1 provides administrator access.
Tags
nuclei_scanner

CVSS Scores

CVSS v3.1

7.8 - HIGH

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0

7.2

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

Exploit Status

Exploited in the Wild
Yes (2025-09-16 00:00:00 UTC) Source

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

Known Exploited Vulnerability Information

Source Added Date
The Shadowserver (via CIRCL) 2025-09-16 00:00:00 UTC

Scanner Integrations

Scanner URL Date Detected
Nuclei https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-3297.yaml 2025-04-25 00:00:00 UTC

Timeline

  • CVE ID Reserved

  • CVE Published to Public

  • Detected by Nuclei

  • Added to KEVIntel