CVE intelligence and bounded remediation

CVE-2022-29639 — Totolink A3100R Firmware security vulnerability

High CVSS 9.3

TOTOLINK A3100R V4.1.2cu.5050_B20200504 and V4.1.2cu.5247_B20211129 were discovered to contain a command injection vulnerability via the magicid parameter in the function uci_cloudupdate_config.

Severity
High
CVSS
9.3 (2.0)
Published
2022-05-18
CISA KEV
Not currently listed
Ecosystem
operating-system

Affected products

  • totolink / a3100r_firmware / 4.1.2cu.5050_b20200504
  • totolink / a3100r_firmware / 4.1.2cu.5247_b20211129

Matched remediation archetype

Command, code, expression, and template injection

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Check exposure

  • Trace untrusted values to process execution, interpreters, evaluators, template engines, dynamic imports, and administrative scripting features.
  • Determine whether the affected path is reachable across each trust boundary and which service account or host privilege it inherits.
  • Review configuration for optional execution features, unsafe compatibility modes, and shell invocation.

Remediate safely

  • Replace string-built commands or evaluated code with fixed operations and structured argument APIs that do not invoke a shell.
  • Use strict allowlists for operation identifiers and reject unexpected input before it reaches any interpreter.
  • Update the affected component and add inert regression tests covering metacharacters, encoding variants, and alternate request paths.

Authoritative sources

Complete CVE record and remediation plan

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