# CVE-2026-79405: Improper Input Validation in Modem Firmware

- Exploited (CISA KEV): no
- Published: 2026-11-04
- CVSS: 7.5 HIGH (v3.1)
- EPSS: no score
- CWE: CWE-20

In Modem Firmware, there is a possible system crash due to improper input validation of dedicated PUCCH configuration. This could lead to remote denial of service 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

2 posts seen since 2026-11-04.

- bluesky 2026-11-04: 🟠 CVE-2026-79405 - High (7.5)  In Modem Firmware, there is a possible system crash due to improper input validation of dedicated...  https://www.thehackerwire.com/vulnerability/CVE-2026-79405/  #infosec #cybersecurity #CVE #vulnerability #security #patchstack (https://bsky.app/profile/thehackerwire.bsky.social/post/3mzhnot3b6n2j)
- mastodon 2026-11-04: 🟠 CVE-2026-79405 - High (7.5) In Modem Firmware, there is a possible system crash due to improper input validation of dedicated PUCCH configuration. This could lead to remote denial of service with no additional execution privileges needed. 🔗 https://www. thehackerwire.com/vul… (https://mastodon.social/@thehackerwire/117556590397664896)

"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-2026-79405 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2026-79405