KEV Entry

CVE-2026-7273

Known Exploited Vulnerability Entry CISA

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Entry Details
Confirmed Exploited

CVE-2026-7273

2026-09-21 00:00 UTC

Timestamps

2026-09-21

2026-09-21

Scope

Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability | Affected: Zyxel / GS1900 Series Switches | Description: Zyxel GS1900 series switches contain a stack-based buffer overflow vulnerability in the CGI program which could allow a LAN-based, unauthenticated attacker to exploit the flaw and potentially execute OS commands via a crafted HTTP request. | Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. | Due date: 2026-09-24 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-stack-based-buffer-overflow-vulnerability-in-gs1900-series-switches-06-16-2026 ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-7273

References
  • {'id': 'CVE-2026-7273', 'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-7273'}

ee44e786-843d-4fbb-8f62-7a9b25eef54e

CISA
405284c2-e461-4670-8979-7fd2c9755a60

2026-09-21 20:00 UTC

2026-09-21 20:00 UTC

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
vendor_report cisa-kev successful_exploitation 0.80
View details 
{
  "cwes": [
    "CWE-121"
  ],
  "date_added": "2026-09-21",
  "due_date": "2026-09-24",
  "feed": "CISA Known Exploited Vulnerabilities Catalog",
  "knownRansomwareCampaignUse": "Unknown",
  "product": "GS1900 Series Switches",
  "vendorProject": "Zyxel",
  "vulnerabilityName": "Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability"
}
 -
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