CVE intelligence and bounded remediation

CVE-2018-15555 — Actiontec Web6000Q Firmware security vulnerability

Critical CVSS 9.8

On Telus Actiontec WEB6000Q v1.1.02.22 devices, an attacker can login with root level access with the user "root" and password "admin" by using the enabled onboard UART headers.

Severity
Critical
CVSS
9.8 (3.0)
Published
2019-06-28
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-662

Affected products

  • actiontec / web6000q_firmware / 1.1.02.22

Matched remediation archetype

Race condition, TOCTOU, and lifecycle synchronization

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Check exposure

  • Map concurrent actors, shared state, lock boundaries, signals, callbacks, retries, and check-then-use sequences in the affected path.
  • Determine whether untrusted users can influence timing, object names, filesystem state, or repeated state transitions.
  • Identify clustered and multi-process behavior that repository-local tests may not represent.

Remediate safely

  • Make the sensitive state transition atomic or protect it with a consistently ordered synchronization primitive.
  • Perform authorization and invariant checks on the same authoritative object and transaction used for the operation.
  • Use unique private resources, safe ownership transfer, and idempotent operations; add deterministic concurrency regression tests.

Authoritative sources

Complete CVE record and remediation plan

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