{"uuid": "ee44e786-843d-4fbb-8f62-7a9b25eef54e", "vulnerability": {"vulnId": "CVE-2026-7273", "altId": []}, "gcve": {"origin_uuid": "405284c2-e461-4670-8979-7fd2c9755a60", "gna": 1, "object_uuid": "ee44e786-843d-4fbb-8f62-7a9b25eef54e"}, "status": {"exploited": true, "status_reason": "confirmed", "status_updated_at": "2026-09-21T00:00:00+00:00"}, "timestamps": {"asserted_at": "2026-09-21T00:00:00+00:00", "recorded_at": "2026-09-21T20:00:02+00:00", "first_seen_at": "2026-09-21T00:00:00+00:00"}, "scope": {"notes": "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\u2019s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA\u2019s \u201cForensics Triage Requirements\u201d (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"}, "evidence": [{"type": "vendor_report", "source": "cisa-kev", "signal": "successful_exploitation", "confidence": 0.8, "details": {"cwes": ["CWE-121"], "feed": "CISA Known Exploited Vulnerabilities Catalog", "product": "GS1900 Series Switches", "due_date": "2026-09-24", "date_added": "2026-09-21", "vendorProject": "Zyxel", "vulnerabilityName": "Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability", "knownRansomwareCampaignUse": "Unknown"}}], "references": [{"id": "CVE-2026-7273", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-7273"}]}