Unauthenticated UART root shell in U-speed WIFI4 N300 router
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-306.
Summary
The WIFI4 N300 router (Model: T1 Pro) v1.0.0 by U-speed exposes a UART debugging interface that lacks authentication, authorization and access control (CWE-306). An attacker who solders and connects to this interface gains root privileges on the system.
Written with Claude Haiku 5.5 from the sources below · 2026-11-03
Description from the CNA
The WIFI4 N300 router (Model: T1 Pro) v1.0.0 by U-speed contains an insecure access control flaw that allows an attacker to gain unauthenticated root shell. The vulnerability is caused by the exposure of the UART debugging interface having a lack of authentication, authorization and access control functionality. Once the interface is soldered and connected to the attacker, they gain root privilege to the system.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
The sources list no fixed version for WIFI4 N300 router (Model: T1 Pro) by U-speed.
Written with Claude Haiku 5.5 from the sources below · 2026-11-03
Timeline
- 2026-10-29 Threatist record created from CVE-2026-79589
- 2026-10-29 Alias added: GHSA-gjjg-f985-vm8f
- 2026-11-03 CVSS score added · CISA ADP
- 2026-11-03 Weakness changed · CISA ADP
- 2026-11-03 CISA SSVC decision points changed
- 2026-11-03 Priority changed: LOW → HIGH
References
Sources
- CVE-2026-79589 · CVE Program
- CVE-2026-79589 · NVD
- FIRST EPSS
- GHSA-gjjg-f985-vm8f · GitHub Advisory Database · CC BY 4.0
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