CVE intelligence and bounded remediation

CVE-2022-26207 — Totolink A830R Firmware security vulnerability

Critical CVSS 9.8

Totolink A830R V5.9c.4729_B20191112, A3100R V4.1.2cu.5050_B20200504, A950RG V4.1.2cu.5161_B20200903, A800R V4.1.2cu.5137_B20200730, A3000RU V5.9c.5185_B20201128, and A810R V4.1.2cu.5182_B20201026 were discovered to contain a command injection vulnerability in the function setDiagnosisCfg, via the ipDoamin parameter. This vulnerability allows attackers to execute arbitrary commands via a crafted request.

Severity
Critical
CVSS
9.8 (3.1)
Published
2022-03-15
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-78

Affected products

  • totolink / a830r_firmware / 5.9c.4729_b20191112
  • totolink / a3100r_firmware / 4.1.2cu.5050_b20200504
  • totolink / a950rg_firmware / 4.1.2cu.5161_b20200903
  • totolink / a800r_firmware / 4.1.2cu.5137_b20200730
  • totolink / a3000ru_firmware / 5.9c.5185_b20201128
  • totolink / a810r_firmware / 4.1.2cu.5182_b20201026

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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