CVE-2023-33009

Known Exploited Vulnerability Entry External Catalog

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Entry Details

CVE-2023-33009

Confirmed

Yes

2023-06-05 00:00 UTC

Timestamps

2023-06-05

2023-06-05

Scope

KEV entry: Zyxel Multiple Firewalls Buffer Overflow Vulnerability | Affected: Zyxel / Multiple Firewalls | Description: Zyxel ATP, USG FLEX, USG FLEX 50(W), USG20(W)-VPN, VPN, and ZyWALL/USG firewalls contain a buffer overflow vulnerability in the notification function that could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and remote code execution on an affected device. | Required action: Apply updates per vendor instructions. | Due date: 2023-06-26 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-buffer-overflow-vulnerabilities-of-firewalls; https://nvd.nist.gov/vuln/detail/CVE-2023-33009

References
  • {'id': 'CVE-2023-33009', 'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2023-33009'}

d9ec5534-4fa6-4376-bccc-ae093c8406c6

405284c2-e461-4670-8979-7fd2c9755a60

2026-02-02 12:26 UTC

2026-02-02 12:26 UTC

Evidence (1)
Type Source Signal Confidence Details GCVE Metadata
vendor_report cisa-kev successful_exploitation 0.80
View details 
{
  "cwes": [
    "CWE-120"
  ],
  "date_added": "2023-06-05",
  "due_date": "2023-06-26",
  "feed": "CISA Known Exploited Vulnerabilities Catalog",
  "knownRansomwareCampaignUse": "Unknown",
  "product": "Multiple Firewalls",
  "vendorProject": "Zyxel",
  "vulnerabilityName": "Zyxel Multiple Firewalls Buffer Overflow Vulnerability"
}
 -
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