{"schema":"threatline.record/2","record":{"id":"CVE-2026-7273","aliases":[],"summary":"Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability","details":"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.","categories":["Network & edge"],"product":"GS1900 Series Switches","vendor":"Zyxel","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-7273","source_modified_at":"2026-09-22T03:55:39.207Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"GS1900-48HPv2 firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"<= 2.90(ABTQ.1)C0"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-7273","source_modified_at":"2026-09-22T03:55:39.207Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"GS1900-8 firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"<= 2.90(AAHH.1)C0"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-7273","source_modified_at":"2026-09-22T03:55:39.207Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"GS1900-8HP firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"<= 2.90(AAHI.1)C0"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-7273","source_modified_at":"2026-09-22T03:55:39.207Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"GS1900-10HP firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"<= 2.90(AAZI.1)C0"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-7273","source_modified_at":"2026-09-22T03:55:39.207Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"GS1900-16 firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"<= 2.90(AAHJ.1)C0"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-7273","source_modified_at":"2026-09-22T03:55:39.207Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"GS1900-24 firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"<= 2.90(AAHL.1)C0"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-7273","source_modified_at":"2026-09-22T03:55:39.207Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"GS1900-24E firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"<= 2.90(AAHK.1)C0"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-7273","source_modified_at":"2026-09-22T03:55:39.207Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"GS1900-24EP firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"<= 2.90(ABTO.1)C0"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-7273","source_modified_at":"2026-09-22T03:55:39.207Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"GS1900-24HPv2 firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"<= 2.90(ABTP.1)C0"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-7273","source_modified_at":"2026-09-22T03:55:39.207Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"GS1900-48 firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"<= 2.90(AAHN.1)C0"}],"defaultStatus":"unaffected"}],"fixed_versions":[],"cvss":8.8,"severity":"High","kev":{"listed":true,"date_added":"2026-09-21","due_date":"2026-09-24","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.","ransomware_campaign_use":"Unknown","forensic_triage":true},"epss":{"probability":0.02501,"percentile":0.84595,"score_date":"2026-10-23"},"published_at":"2026-06-16T02:20:29.847Z","modified_at":"2026-09-22T03:55:39.207Z","provenance":[{"source":"CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T17:00:09.9001Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-7273","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-09-22T03:55:39.207Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-7273","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","EPSS"],"references":[{"source":"CVE List","url":"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","tags":["vendor-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-7273","source":"CISA KEV"},{"source":"CVE List","url":"https://www.greynoise.io/blog/open-season-on-kapibala-attacker-steals-government-records-wordpress-exploitation","tags":["third-party-advisory"]},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-7273","tags":["government-resource"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"active","automatable":"no","technical_impact":"total","assessed_at":"2026-06-17T00:00:00+00:00"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"vendor and product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-09-22T03:55:39.207Z","content_hash":"f2dba8ceb77770fc76fc4eb2817cd339fe55172f6986a9ccacd4f894edd338ee"}}