# CVE-2026-80335: Out-of-bounds Write in Bootloader

- Exploited (CISA KEV): no
- Published: 2026-11-04
- CVSS: 8.4 HIGH (v3.1)
- EPSS: no score
- CWE: CWE-787

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.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | No public claim | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | No public claim | — | — |
| Fastly | No public claim | — | — |
| Vercel | No public claim | — | — |
| F5 | No public claim | — | — |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

## Social

3 posts seen since 2026-11-04.

- bluesky 2026-11-04: 🟠 CVE-2026-80335 - High (7.6)  In the bootloader download module, there is a possible out-of-bounds write due to a failure to re...  https://www.thehackerwire.com/vulnerability/CVE-2026-80335/  #infosec #cybersecurity #CVE #vulnerability #security #patchstack (https://bsky.app/profile/thehackerwire.bsky.social/post/3mzhnozeqxg2q)
- mastodon 2026-11-04: 🟠 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.… (https://mastodon.social/@thehackerwire/117556590966719551)
- bluesky 2026-11-04: CVE-2026-80335 - Out-of-bounds Write in Bootloader CVE ID : CVE-2026-80335    Published : Nov. 4, 2026, 4:17 a.m. \| 47 minutes ago    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... (https://bsky.app/profile/cve.skyfleet.blue/post/2qe3f22ig6ofo)

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2026-80335 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2026-80335