CVE-2021-3297

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

20.51% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 97.3% of scored records. A rank, not a probability.

NVD base score

7.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-01-26 07:11Z5 YR AGO

Last updated

2025-11-25 17:27Z9 MO AGO

Reserved

2021-01-25

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-287Improper AuthenticationClass

Data version

5.2

Document digest

5e139ff841f9a32fb6246590fd5d73b72514daf9c5973233c564fe75b128f03c

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