{"basis":"claimed","id":"CVE-2026-80335","name":"Out-of-bounds Write in Bootloader","vendorProject":"Unisoc (Shanghai) Technologies Co., Ltd.","product":"Bootloader","publishedAt":"2026-11-04","cvss":{"score":8.4,"severity":"HIGH","version":"3.1"},"exploited":null,"epss":null,"coverage":{"cloudflare":{"status":"none","firstOn":null,"daysToRule":null},"aws":{"status":"none","firstOn":null,"daysToRule":null},"azure":{"status":"none","firstOn":null,"daysToRule":null},"google":{"status":"none","firstOn":null,"daysToRule":null},"fastly":{"status":"none","firstOn":null,"daysToRule":null},"vercel":{"status":"none","firstOn":null,"daysToRule":null},"f5":{"status":"none","firstOn":null,"daysToRule":null},"akamai":{"status":"no_source","firstOn":null,"daysToRule":null},"crs":{"status":"none","firstOn":null,"daysToRule":null}},"title":"Out-of-bounds Write in Bootloader","description":"In the bootloader download module, there is a possible out-of-bounds write due to a failure to reset a global offset variable during firmware update sessions. This could lead to heap memory corruption, system crash, or potential arbitrary code execution with no additional execution privileges needed.","cwes":["CWE-787"],"vendors":[{"vendor":"cloudflare","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"aws","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"azure","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"google","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"fastly","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"vercel","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"f5","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"akamai","status":"no_source","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"crs","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]}],"updatedAt":"2026-11-04T05:25:08.356Z","cvssVector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","ssvc":null,"kevAction":null,"kevNotes":null,"references":[{"url":"https://www.unisoc.com/en/support/product-security-bulletin/2117823464494759937","name":null,"tags":[]}],"affected":[{"vendor":"Unisoc (Shanghai) Technologies Co., Ltd.","product":"Bootloader","affected":["SC9863A","SC9832E","SC7731E","T310","T610","T618","T7200","T7225"],"fixed":[]}],"briefing":{"status":{"id":"monitor","label":"Monitor"},"why":"No edge WAF vendor names it in a changelog, so default managed rules may or may not catch it. Exploitation in the wild is not established by CISA KEV.","who":"Teams running Unisoc (Shanghai) Technologies Co., Ltd. Bootloader (SC9863A; SC9832E; SC7731E; more in the CVE record).","what_to_do":[{"text":"Apply the vendor's fix; the advisory lists the affected and fixed versions."},{"text":"Do not rely on WAF defaults: no edge vendor names this CVE. Restrict access to the vulnerable component or add a custom rule until it is patched.","href":"#edge","linkText":"Edge coverage"},{"text":"Check which WAF sits in front of your site and whether it covers this CVE.","href":"#check","linkText":"Check your domain"}],"evidence":[{"heading":"CVE record","text":"CVSS 3.1 8.4 (high). Weakness: CWE-787.","links":[{"label":"CVE-2026-80335","href":"https://www.cve.org/CVERecord?id=CVE-2026-80335"},{"label":"NVD","href":"https://nvd.nist.gov/vuln/detail/CVE-2026-80335"}]},{"heading":"Exploit evidence","text":"No public exploit code found in Exploit-DB, Metasploit, nuclei-templates or GitHub. That does not mean none exists.","links":[]},{"heading":"CISA KEV","text":"Not in the KEV catalog (catalog 2026.11.03, checked 2026-11-04). Absence from KEV is not evidence that it cannot be exploited.","links":[{"label":"CISA KEV catalog","href":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog"}]},{"heading":"WAF vendor statements","text":"No edge vendor changelog names it.","links":[]}],"agent_prompt":"Assess whether the infrastructure available to you is affected by CVE-2026-80335 (Out-of-bounds Write in Bootloader). Perform a read-only assessment within your authorized access. Do not send exploit traffic, scan third-party systems, change configuration or restart services.\n\n1. Verify the CVE record at https://www.cve.org/CVERecord?id=CVE-2026-80335 and the vendor advisory. Establish affected and fixed versions, including vendor backports. The record lists: Unisoc (Shanghai) Technologies Co., Ltd. Bootloader: affected SC9863A; SC9832E; SC7731E; T310. Cite sources and retrieval dates; flag anything you cannot verify.\n2. Inventory deployments of Unisoc (Shanghai) Technologies Co., Ltd. Bootloader: asset, environment, owner where known, installed version or build, and how you confirmed it (package metadata, a version endpoint, image tags). An image tag alone does not prove the running version.\n3. Identify which deployments are reachable from the internet or untrusted networks, and through which paths (direct origin, load balancer, CDN or WAF).\n4. Assess compensating controls separately from patch status. Current edge WAF coverage for this CVE: no edge WAF vendor names it. Live data: https://cve.vigilbase.com/api/v1/cves/CVE-2026-80335. Check whether the rule is enabled and in block mode on each path, and whether any path bypasses the WAF. A WAF rule is not a patch.\n5. Check logs on exposed instances for requests matching the public exploit, if your access allows.\n\nReturn a short summary and a table: asset | version/build | assessment (affected, fixed, not applicable, unknown) | exposure | compensating control | evidence | next action. List what you could not assess and the access needed to resolve it. Do not infer absence of compromise from patch status or a lack of alerts.\n\nRemediation guidance: Apply the vendor's fix; the advisory lists the affected and fixed versions. Do not rely on WAF defaults: no edge vendor names this CVE. Restrict access to the vulnerable component or add a custom rule until it is patched.\nMore: https://cve.vigilbase.com/cve/CVE-2026-80335"},"measured":[],"sightings":null,"social":{"total":3,"first_seen":"2026-11-04T05:22:23.315Z","daily":[{"day":"2026-10-22","posts":0},{"day":"2026-10-23","posts":0},{"day":"2026-10-24","posts":0},{"day":"2026-10-25","posts":0},{"day":"2026-10-26","posts":0},{"day":"2026-10-27","posts":0},{"day":"2026-10-28","posts":0},{"day":"2026-10-29","posts":0},{"day":"2026-10-30","posts":0},{"day":"2026-10-31","posts":0},{"day":"2026-11-01","posts":0},{"day":"2026-11-02","posts":0},{"day":"2026-11-03","posts":0},{"day":"2026-11-04","posts":3}],"top_posts":[{"source":"bluesky","kind":"post","url":"https://bsky.app/profile/thehackerwire.bsky.social/post/3mzhnozeqxg2q","author":"thehackerwire.bsky.social","author_name":"TheHackerWire","avatar_url":"https://cdn.bsky.app/img/avatar/plain/did:plc:yhhqv2c64q5xv7mdwy6dbwqq/bafkreibnofwla3zl6epzaubi52gnzfchkqufk3k3eaktsy4ibsm7dtemeu","text":"🟠 CVE-2026-80335 - High (7.6)\n\nIn the bootloader download module, there is a possible out-of-bounds write due to a failure to re...\n\nhttps://www.thehackerwire.com/vulnerability/CVE-2026-80335/\n\n#infosec #cybersecurity #CVE #vulnerability #security #patchstack","engagement":0,"posted_at":"2026-11-04T05:47:25.000Z"},{"source":"mastodon","kind":"post","url":"https://mastodon.social/@thehackerwire/117556590966719551","author":"thehackerwire","author_name":"TheHackerWire","avatar_url":"https://files.mastodon.social/accounts/avatars/115/755/483/699/003/887/original/be4cc997d460de98.jpg","text":"🟠 CVE-2026-80335 - High (7.6) In the bootloader download module, there is a possible out-of-bounds write due to a failure to reset a global offset variable during firmware update sessions. This could lead to heap memory corruption, system crash, or potential arbitrary code exe.…","engagement":0,"posted_at":"2026-11-04T05:47:04.471Z"},{"source":"bluesky","kind":"post","url":"https://bsky.app/profile/cve.skyfleet.blue/post/2qe3f22ig6ofo","author":"cve.skyfleet.blue","author_name":"CVE Alerts ","avatar_url":"https://cdn.bsky.app/img/avatar/plain/did:plc:myutg2pwkjbukv7pq2hp5mtl/bafkreidzrx72dabuipp2ej2gldupqzv5nbtbez7tv4n26ekzjsot6ocdam","text":"CVE-2026-80335 - Out-of-bounds Write in Bootloader\nCVE ID : CVE-2026-80335\n \n Published : Nov. 4, 2026, 4:17 a.m. | 47 minutes ago\n \n Description : In the bootloader download module, there is a possible out-of-bounds write due to a failure to reset a global offset variable dur...","engagement":0,"posted_at":"2026-11-04T05:22:23.315Z"}],"exploit_repositories":[]}}