KEV Entry

CVE-2023-28771

Known Exploited Vulnerability Entry Previdian

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Entry Details
Confirmed Exploited

CVE-2023-28771

2023-05-31 02:00 CEST

Timestamps

2023-05-31

2023-05-31

Scope

Improper error message handling in Zyxel ZyWALL/USG series firmware versions 4.60 through 4.73, VPN series firmware versions 4.60 through 5.35, USG... | Affected: Zyxel / ZyWALL/USG series firmware, VPN series firmware, USG FLEX series firmware, ATP series firmware | CVSS: 9.8 (CRITICAL) | EPSS: 0.99284 | Used in malware: unknown | Not yet in CISA KEV: False

References
  • {'id': 'CVE-2023-28771', 'url': 'https://www.cve.org/CVERecord?id=CVE-2023-28771'}
  • {'id': 'previdian', 'url': 'https://previdian.com/CVE-2023-28771'}

ef874864-b2dd-496f-8a6d-c2f4289d6ba9

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

2026-10-02 09:11 CEST

2026-10-02 09:11 CEST

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
public_report previdian successful_exploitation 0.70
View details 
{
  "added_date": "2023-05-31T00:00:00.000Z",
  "ahead_of_cisa_kev": null,
  "cve_id": "CVE-2023-28771",
  "cvss_estimated": false,
  "cvss_score": 9.8,
  "cvss_severity": "CRITICAL",
  "epss_percentile": 0.99937,
  "epss_score": 0.99284,
  "feed": "Previdian (previdian.com)",
  "ghsa_id": null,
  "not_yet_in_cisa_kev": false,
  "previous_ids": [],
  "product": "ZyWALL/USG series firmware, VPN series firmware, USG FLEX series firmware, ATP series firmware",
  "title": "Improper error message handling in Zyxel ZyWALL/USG series firmware versions 4.60 through 4.73, VPN series firmware versions 4.60 through 5.35, USG...",
  "used_in_malware": "unknown",
  "vendor": "Zyxel",
  "virtual_patch": false,
  "vulnerability_id": "CVE-2023-28771"
}
 -
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