Auth bypass in Zyxel Nbg2105
CVE-2021-3297
On Zyxel NBG2105 V1.00(AAGU.2)C0 devices, setting the login cookie to 1 provides administrator access.
Vulnerability class: Broken Authentication
EPSS: 0.205 (97.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Zyxel Nbg2105
- Zyxel Nbg2105_firmware — versions v1.00\(aagu.2\)c0
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (Vendor Advisory)
- cve@mitre.org (Product, Vendor Advisory)
- cve@mitre.org (Exploit, Third Party Advisory)
- cve@mitre.org
Frequently asked questions
- What is CVE-2021-3297?
- CVE-2021-3297 is a high-severity vulnerability in Zyxel Nbg2105, classified under Improper Authentication. CVSS score: 7.8/10. Published 2021-01-26.
- How severe is CVE-2021-3297?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2021-3297 known to be exploited?
- 21 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.