CVE intelligence and bounded remediation

CVE-2021-26727 — Lannerinc Iac-Ast2500A Firmware security vulnerability

Critical CVSS 10

Multiple command injections and stack-based buffer overflows vulnerabilities in the SubNet_handler_func function of spx_restservice allow an attacker to execute arbitrary code with the same privileges as the server user (root). This issue affects: Lanner Inc IAC-AST2500A standard firmware version 1.10.0.

Severity
Critical
CVSS
10 (3.1)
Published
2022-10-24
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-94, CWE-121, CWE-77, CWE-787

Affected products

  • lannerinc / iac-ast2500a_firmware / 1.10.0

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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