CVE intelligence and bounded remediation

CVE-2021-36260 — Hikvision Improper Input Validation

Critical CVSS 9.8 CISA KEV

A command injection vulnerability in the web server of some Hikvision product. Due to the insufficient input validation, attacker can exploit the vulnerability to launch a command injection attack by sending some messages with malicious commands.

Severity
Critical
CVSS
9.8 (3.1)
Published
2021-09-22
CISA KEV
Known exploited
Ecosystem
operating-system
Weaknesses
CWE-78

Affected products

  • hikvision / ds-2cd2026g2-iu/sl_firmware
  • hikvision / ds-2cd2046g2-iu/sl_firmware
  • hikvision / ds-2cd2066g2-i(u)_firmware
  • hikvision / ds-2cd2066g2-iu/sl_firmware
  • hikvision / ds-2cd2086g2-i(u)_firmware
  • hikvision / ds-2cd2086g2-iu/sl_firmware

Showing 6 representative product identities from 305 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

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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