KEV Entry

CVE-2021-3297

Known Exploited Vulnerability Entry Previdian

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Entry Details
Confirmed Exploited

CVE-2021-3297

2025-09-16 02:00 CEST

Timestamps

2025-09-16

2025-09-16

Scope

On Zyxel NBG2105 V1.00(AAGU.2)C0 devices, setting the login cookie to 1 provides administrator access. | Affected: Zyxel / NBG2105 | CVSS: 7.8 (HIGH) | EPSS: 0.20514 | Used in malware: unknown | Not yet in CISA KEV: True

References
  • {'id': 'CVE-2021-3297', 'url': 'https://www.cve.org/CVERecord?id=CVE-2021-3297'}
  • {'id': 'previdian', 'url': 'https://previdian.com/CVE-2021-3297'}

8b1d0095-b0ff-4ca7-ab2d-d3d7f4cf9f18

Previdian
caeb2787-0d58-4236-9039-7c86c3e566f3

2026-10-02 09:09 CEST

2026-10-02 09:09 CEST

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
public_report previdian successful_exploitation 0.70
View details 
{
  "added_date": "2025-09-16T00:00:00.000Z",
  "ahead_of_cisa_kev": null,
  "cve_id": "CVE-2021-3297",
  "cvss_estimated": false,
  "cvss_score": 7.8,
  "cvss_severity": "HIGH",
  "epss_percentile": 0.97444,
  "epss_score": 0.20514,
  "feed": "Previdian (previdian.com)",
  "ghsa_id": null,
  "not_yet_in_cisa_kev": true,
  "previous_ids": [],
  "product": "NBG2105",
  "title": "On Zyxel NBG2105 V1.00(AAGU.2)C0 devices, setting the login cookie to 1 provides administrator access.",
  "used_in_malware": "unknown",
  "vendor": "Zyxel",
  "virtual_patch": false,
  "vulnerability_id": "CVE-2021-3297"
}
 -
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