{"id":"CVE-2026-76870","state":"PUBLISHED","title":"Netcore NR255-V 1.5.130703 Out-of-Bounds Read in mtd_write Firmware Upload Validation","description":"Netcore NR255-V version 1.5.130703 contains an out-of-bounds read vulnerability in the mtd_write pre-flash validation routine triggered by short firmware uploads. Attackers can upload a truncated firmware image via put_file_cgi.c to trigger out-of-bounds reads across main.c, check_image_uuid.c, and oemMD5Update.c.","publishedAt":"2026-09-15T21:58:01.174Z","updatedAt":"2026-09-16T19:32:33.063Z","severity":{"score":7.1,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["Netcore NR255-V"],"affected":[{"vendor":"Netcore","product":"NR255-V","defaultStatus":"unaffected","versions":[{"version":"1.5.130703","status":"affected","versionType":"custom"}]}],"references":["https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr255v-firmware-upload-oob.md","https://www.vulncheck.com/advisories/netcore-nr255-v-1.5.130703-out-of-bounds-read-in-mtd-write-firmware-upload-validation"],"weaknesses":["CWE-125"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/76xxx/CVE-2026-76870.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-76870","state":"PUBLISHED","datePublished":"2026-09-15T21:58:01.174Z","dateUpdated":"2026-09-16T19:32:33.063Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-08-19T21:47:08.936Z"},"containers":{"cna":{"title":"Netcore NR255-V 1.5.130703 Out-of-Bounds Read in mtd_write Firmware Upload Validation","descriptions":[{"lang":"en","value":"Netcore NR255-V version 1.5.130703 contains an out-of-bounds read vulnerability in the mtd_write pre-flash validation routine triggered by short firmware uploads. Attackers can upload a truncated firmware image via put_file_cgi.c to trigger out-of-bounds reads across main.c, check_image_uuid.c, and oemMD5Update.c."}],"affected":[{"vendor":"Netcore","product":"NR255-V","defaultStatus":"unaffected","versions":[{"version":"1.5.130703","status":"affected","versionType":"custom"}]}],"references":[{"url":"https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr255v-firmware-upload-oob.md","name":"Netcore router public references: Out-of-bounds Reads in mtd_write Pre-flash Validation via Short Firmware Upload","tags":["third-party-advisory"]},{"url":"https://www.vulncheck.com/advisories/netcore-nr255-v-1.5.130703-out-of-bounds-read-in-mtd-write-firmware-upload-validation","name":"VulnCheck Advisory: Netcore NR255-V 1.5.130703 Out-of-Bounds Read in mtd_write Firmware Upload Validation","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":7.1,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":7.1,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-125","lang":"en","description":"Out-of-bounds Read","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-09-15T21:58:01.174Z"},"datePublic":"2026-09-04T00:00:00.000Z","credits":[{"lang":"en","value":"Zhou Ao","type":"finder"},{"lang":"en","value":"Yin Luxing","type":"finder"},{"lang":"en","value":"Jiang Yuxuan","type":"finder"},{"lang":"en","value":"Liu Xin","type":"finder"},{"lang":"en","value":"@Nebusec","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-16T19:32:19.664110Z","id":"CVE-2026-76870","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-16T19:32:33.063Z"}}]}}}