CVE intelligence and bounded remediation

CVE-2025-28026 — Totolink A830R Firmware security vulnerability

High CVSS 7.3

TOTOLINK A830R V4.1.2cu.5182_B20201102, A950RG V4.1.2cu.5161_B20200903, A3000RU V5.9c.5185_B20201128, and A3100R V4.1.2cu.5247_B20211129 were found to contain a buffer overflow vulnerability in downloadFile.cgi.

Severity
High
CVSS
7.3 (3.1)
Published
2025-04-22
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-121

Affected products

  • totolink / a830r_firmware / 4.1.2cu.5182_b20201102
  • totolink / a950rg_firmware / 4.1.2cu.5161_b20200903
  • totolink / a3000ru_firmware / 5.9c.5185_b20201128
  • totolink / a3100r_firmware / 4.1.2cu.5247_b20211129

Matched remediation archetype

Buffer bounds, memory safety, and memory corruption

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Check exposure

  • Identify affected native-code versions, build flags, architectures, parsers, codecs, drivers, and input paths in all shipped artifacts.
  • Determine whether untrusted data reaches the affected routine and the process privilege, sandbox, and network exposure.
  • Confirm statically linked, vendored, firmware, and platform-provided copies, not only package-manager records.

Remediate safely

  • Apply the maintained upstream correction or replace the affected component, then rebuild every dependent artifact from clean inputs.
  • Adopt bounds-checked interfaces, validated sizes and integer conversions, clear ownership, and memory-safe components where practical.
  • Enable supported compiler and runtime hardening and add sanitized tests and fuzz regression seeds derived from non-weaponized fixtures.

Authoritative sources

Complete CVE record and remediation plan

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