CVE-2021-3297
HIGHCVSS 7.8/10EPSS 20.51%
Last modified
CVE-2021-3297 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. On Zyxel NBG2105 V1.00(AAGU.2)C0 devices, setting the login cookie to 1 provides administrator access.. EPSS estimates a 20.51% chance of exploitation in the next 30 days.
Description
On Zyxel NBG2105 V1.00(AAGU.2)C0 devices, setting the login cookie to 1 provides administrator access.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Zyxel | Nbg2105 Firmware | v1.00\(aagu.2\)c0 |
References
- https://github.com/nieldk/vulnerabilities/blob/main/zyxel%20nbg2105/Admin%20bypassExploit, Third Party Advisory
- https://www.zyxel.com/support/SupportLandingSR.shtml?c=gb&l=en&kbid=M-01490&md=NBG2105Product, Vendor Advisory
- https://github.com/nieldk/vulnerabilities/blob/main/zyxel%20nbg2105/Admin%20bypassExploit, Third Party Advisory
- https://www.zyxel.com/support/SupportLandingSR.shtml?c=gb&l=en&kbid=M-01490&md=NBG2105Product, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-3297?
On Zyxel NBG2105 V1.00(AAGU.2)C0 devices, setting the login cookie to 1 provides administrator access.
How severe is CVE-2021-3297?
CVE-2021-3297 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 20.51% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3297?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-3297?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST