{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-7273: A stack-based buffer overflow vulnerability in the CGI program of Zyxel GS1900-48HPv2 firmware versions through 2","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-7273","status":"final","version":"1","initial_release_date":"2026-06-16T02:20:29.847Z","current_release_date":"2026-06-16T02:20:29.847Z","revision_history":[{"date":"2026-06-16T02:20:29.847Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-7273 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-7273"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-7273"},{"category":"external","summary":"zyxel.com","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"}]},"product_tree":{"branches":[{"category":"vendor","name":"Zyxel","branches":[{"category":"product_name","name":"GS1900-48HPv2 firmware","branches":[{"category":"product_version","name":"<= 2.90(ABTQ.1)C0","product":{"name":"Zyxel GS1900-48HPv2 firmware <= 2.90(ABTQ.1)C0","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:zyxel:gs1900-48hpv2_firmware:\\<\\=_2.90\\(abtq.1\\)c0:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Zyxel","branches":[{"category":"product_name","name":"GS1900-8 firmware","branches":[{"category":"product_version","name":"<= 2.90(AAHH.1)C0","product":{"name":"Zyxel GS1900-8 firmware <= 2.90(AAHH.1)C0","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:zyxel:gs1900-8_firmware:\\<\\=_2.90\\(aahh.1\\)c0:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Zyxel","branches":[{"category":"product_name","name":"GS1900-8HP firmware","branches":[{"category":"product_version","name":"<= 2.90(AAHI.1)C0","product":{"name":"Zyxel GS1900-8HP firmware <= 2.90(AAHI.1)C0","product_id":"CSAFPID-3","product_identification_helper":{"cpe":"cpe:2.3:a:zyxel:gs1900-8hp_firmware:\\<\\=_2.90\\(aahi.1\\)c0:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Zyxel","branches":[{"category":"product_name","name":"GS1900-10HP firmware","branches":[{"category":"product_version","name":"<= 2.90(AAZI.1)C0","product":{"name":"Zyxel GS1900-10HP firmware <= 2.90(AAZI.1)C0","product_id":"CSAFPID-4","product_identification_helper":{"cpe":"cpe:2.3:a:zyxel:gs1900-10hp_firmware:\\<\\=_2.90\\(aazi.1\\)c0:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Zyxel","branches":[{"category":"product_name","name":"GS1900-16 firmware","branches":[{"category":"product_version","name":"<= 2.90(AAHJ.1)C0","product":{"name":"Zyxel GS1900-16 firmware <= 2.90(AAHJ.1)C0","product_id":"CSAFPID-5","product_identification_helper":{"cpe":"cpe:2.3:a:zyxel:gs1900-16_firmware:\\<\\=_2.90\\(aahj.1\\)c0:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Zyxel","branches":[{"category":"product_name","name":"GS1900-24 firmware","branches":[{"category":"product_version","name":"<= 2.90(AAHL.1)C0","product":{"name":"Zyxel GS1900-24 firmware <= 2.90(AAHL.1)C0","product_id":"CSAFPID-6","product_identification_helper":{"cpe":"cpe:2.3:a:zyxel:gs1900-24_firmware:\\<\\=_2.90\\(aahl.1\\)c0:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Zyxel","branches":[{"category":"product_name","name":"GS1900-24E firmware","branches":[{"category":"product_version","name":"<= 2.90(AAHK.1)C0","product":{"name":"Zyxel GS1900-24E firmware <= 2.90(AAHK.1)C0","product_id":"CSAFPID-7","product_identification_helper":{"cpe":"cpe:2.3:a:zyxel:gs1900-24e_firmware:\\<\\=_2.90\\(aahk.1\\)c0:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Zyxel","branches":[{"category":"product_name","name":"GS1900-24EP firmware","branches":[{"category":"product_version","name":"<= 2.90(ABTO.1)C0","product":{"name":"Zyxel GS1900-24EP firmware <= 2.90(ABTO.1)C0","product_id":"CSAFPID-8","product_identification_helper":{"cpe":"cpe:2.3:a:zyxel:gs1900-24ep_firmware:\\<\\=_2.90\\(abto.1\\)c0:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Zyxel","branches":[{"category":"product_name","name":"GS1900-24HPv2 firmware","branches":[{"category":"product_version","name":"<= 2.90(ABTP.1)C0","product":{"name":"Zyxel GS1900-24HPv2 firmware <= 2.90(ABTP.1)C0","product_id":"CSAFPID-9","product_identification_helper":{"cpe":"cpe:2.3:a:zyxel:gs1900-24hpv2_firmware:\\<\\=_2.90\\(abtp.1\\)c0:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Zyxel","branches":[{"category":"product_name","name":"GS1900-48 firmware","branches":[{"category":"product_version","name":"<= 2.90(AAHN.1)C0","product":{"name":"Zyxel GS1900-48 firmware <= 2.90(AAHN.1)C0","product_id":"CSAFPID-10","product_identification_helper":{"cpe":"cpe:2.3:a:zyxel:gs1900-48_firmware:\\<\\=_2.90\\(aahn.1\\)c0:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-7273","title":"A stack-based buffer overflow vulnerability in the CGI program of Zyxel GS1900-48HPv2 firmware versions through 2","notes":[{"category":"description","text":"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.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5","CSAFPID-6","CSAFPID-7","CSAFPID-8","CSAFPID-9","CSAFPID-10"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"products":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5","CSAFPID-6","CSAFPID-7","CSAFPID-8","CSAFPID-9","CSAFPID-10"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5","CSAFPID-6","CSAFPID-7","CSAFPID-8","CSAFPID-9","CSAFPID-10"]}]}]}