CVE intelligence and bounded remediation

CVE-2025-4496 — A vulnerability was found in TOTOLINK T10, A3100R, A950RG, A800R, N600R, A3000RU and A810R 4.1.8cu.5241_B20210927

Critical CVSS 9.8

A vulnerability was found in TOTOLINK T10, A3100R, A950RG, A800R, N600R, A3000RU and A810R 4.1.8cu.5241_B20210927. It has been declared as critical. This vulnerability affects the function CloudACMunualUpdate of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument FileName leads to buffer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

Severity
Critical
CVSS
9.8 (3.1)
Published
2025-05-10
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-119, CWE-120

Affected products

  • totolink / a3000ru_firmware / 4.1.8cu.5241_b20210927
  • totolink / a810r_firmware / 4.1.8cu.5241_b20210927
  • totolink / t10_firmware / 4.1.8cu.5241_b20210927
  • totolink / a3100r_firmware / 4.1.8cu.5241_b20210927
  • totolink / a950rg_firmware / 4.1.8cu.5241_b20210927
  • totolink / a800r_firmware / 4.1.8cu.5241_b20210927

Showing 6 representative product identities from 7 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Buffer bounds, memory safety, and memory corruption

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

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

The detailed catalog view below loads this exact record, its source evidence, and the full seven-phase agentic change plan.