{"id":"CVE-2026-7273","aliases":["EUVD-2026-37030","GHSA-rrv4-8jq5-8j78"],"status":"published","title":"A stack-based buffer overflow vulnerability in the CGI program of Zyxel GS1900-48HPv2 firmware...","description":"A stack-based buffer overflow vulnerability in the CGI program of Zyxel GS1900-48HPv2 firmware versions through 2.90(ABTQ.1)C0 could allow a LAN-based, unauthenticated attacker to exploit the flaw and potentially execute OS commands via a crafted HTTP request.","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.02734,"percentile":0.86295,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":false,"fix_available":false},"cwes":["CWE-121"],"published":"2026-06-16T02:20:29Z","modified":"2026-10-25T23:10:00Z","kev":{"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.","known_ransomware_use":"Unknown"},"exploitation":[{"source":"euvd","since":"2026-09-21"},{"source":"kev","since":"2026-09-21"}],"products":[{"vendor":"zyxel","product":"gs1900 series switches"},{"vendor":"zyxel","product":"gs1900-10hp firmware"},{"vendor":"zyxel","product":"gs1900-10hp_firmware"},{"vendor":"zyxel","product":"gs1900-16 firmware"},{"vendor":"zyxel","product":"gs1900-16_firmware"},{"vendor":"zyxel","product":"gs1900-24 firmware"},{"vendor":"zyxel","product":"gs1900-24_firmware"},{"vendor":"zyxel","product":"gs1900-24e firmware"},{"vendor":"zyxel","product":"gs1900-24e_firmware"},{"vendor":"zyxel","product":"gs1900-24ep firmware"},{"vendor":"zyxel","product":"gs1900-24ep_firmware"},{"vendor":"zyxel","product":"gs1900-24hpv2 firmware"},{"vendor":"zyxel","product":"gs1900-24hpv2_firmware"},{"vendor":"zyxel","product":"gs1900-48 firmware"},{"vendor":"zyxel","product":"gs1900-48_firmware"},{"vendor":"zyxel","product":"gs1900-48hpv2 firmware"},{"vendor":"zyxel","product":"gs1900-48hpv2_firmware"},{"vendor":"zyxel","product":"gs1900-8 firmware"},{"vendor":"zyxel","product":"gs1900-8_firmware"},{"vendor":"zyxel","product":"gs1900-8hp firmware"},{"vendor":"zyxel","product":"gs1900-8hp_firmware"}],"references":[{"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","Vendor Advisory"]},{"url":"https://www.greynoise.io/blog/open-season-on-kapibala-attacker-steals-government-records-wordpress-exploitation","tags":["third-party-advisory","Exploit","Third Party Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-7273","tags":["government-resource","Third Party Advisory","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-7273"},{"url":"https://github.com/advisories/GHSA-rrv4-8jq5-8j78"}],"sources":{"cve":[{"id":"CVE-2026-7273","description":"A stack-based buffer overflow vulnerability in the CGI program of Zyxel GS1900-48HPv2 firmware versions through 2.90(ABTQ.1)C0 could allow a LAN-based, unauthenticated attacker to exploit the flaw and potentially execute OS commands via a crafted HTTP request.","status":"published","published":"2026-06-16T02:20:29.847Z","modified":"2026-09-22T03:55:39.207Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T14:20:06.216584Z"}],"euvd":[{"id":"EUVD-2026-37030","description":"A stack-based buffer overflow vulnerability in the CGI program of Zyxel GS1900-48HPv2 firmware versions through 2.90(ABTQ.1)C0 could allow a LAN-based, unauthenticated attacker to exploit the flaw and potentially execute OS commands via a crafted HTTP request.","status":"published","published":"2026-06-16T02:20:29Z","modified":"2026-09-22T03:55:39Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"exploited_since":"2026-09-21","updated_at":"2026-11-02T17:28:03.79222Z"}],"ghsa":[{"id":"GHSA-rrv4-8jq5-8j78","title":"A stack-based buffer overflow vulnerability in the CGI program of Zyxel GS1900-48HPv2 firmware...","description":"A stack-based buffer overflow vulnerability in the CGI program of Zyxel GS1900-48HPv2 firmware versions through 2.90(ABTQ.1)C0 could allow a LAN-based, unauthenticated attacker to exploit the flaw and potentially execute OS commands via a crafted HTTP request.","status":"published","published":"2026-06-16T03:30:36Z","modified":"2026-09-21T21:31:34Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T15:12:15.996228Z"}],"kev":[{"id":"CVE-2026-7273","title":"Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability","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.","cwes":["CWE-121"],"kev":{"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.","known_ransomware_use":"Unknown"},"updated_at":"2026-11-02T17:00:15.999436Z"}],"nvd":[{"id":"CVE-2026-7273","description":"A stack-based buffer overflow vulnerability in the CGI program of Zyxel GS1900-48HPv2 firmware versions through 2.90(ABTQ.1)C0 could allow a LAN-based, unauthenticated attacker to exploit the flaw and potentially execute OS commands via a crafted HTTP request.","status":"published","published":"2026-06-16T03:16:13.557Z","modified":"2026-10-25T23:10:00.167Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T14:12:24.19758Z"}]}}