CVE intelligence and bounded remediation

CVE-2020-25241 — A vulnerability has been identified in SIMATIC MV400 family (All Versions < V7.0.6)

High CVSS 7.5

A vulnerability has been identified in SIMATIC MV400 family (All Versions < V7.0.6). The underlying TCP stack of the affected products does not correctly validate the sequence number for incoming TCP RST packages. An attacker could exploit this to terminate arbitrary TCP sessions.

Severity
High
CVSS
7.5 (3.1)
Published
2021-03-15
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-1285, CWE-129

Affected products

  • siemens / simatic_mv440_sr_firmware
  • siemens / simatic_mv440_hr_firmware
  • siemens / simatic_mv440_ur_firmware
  • siemens / simatic_mv420_sr-b_firmware
  • siemens / simatic_mv420_sr-p_firmware
  • siemens / simatic_mv420_sr-b_body_firmware

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

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