CVE intelligence and bounded remediation

CVE-2019-12621 — A vulnerability in Cisco HyperFlex Software could allow an unauthenticated, remote attacker to perform a man-in-the-middle attack

High CVSS 7.4

A vulnerability in Cisco HyperFlex Software could allow an unauthenticated, remote attacker to perform a man-in-the-middle attack. The vulnerability is due to insufficient key management. An attacker could exploit this vulnerability by obtaining a specific encryption key for the cluster. A successful exploit could allow the attacker to perform a man-in-the-middle attack against other nodes in the cluster.

Severity
High
CVSS
7.4 (3.1)
Published
2019-08-21
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-320, CWE-327

Affected products

  • cisco / hyperflex_hx220c_m5_firmware / 3.0(1a)
  • cisco / hyperflex_hx220c_m5_firmware / 3.5(2a)
  • cisco / hyperflex_hx240c_m5_firmware / 3.0(1a)
  • cisco / hyperflex_hx240c_m5_firmware / 3.5(2a)
  • cisco / hyperflex_hx220c_af_m5_firmware / 3.0(1a)
  • cisco / hyperflex_hx220c_af_m5_firmware / 3.5(2a)

Showing 6 representative product identities from 10 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Cryptography, certificate, signature, and channel validation

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Check exposure

  • Inventory affected algorithms, key uses, trust stores, certificate validation settings, random sources, and plaintext channels across clients and services.
  • Determine which secrets, identities, signatures, or data protections depend on the affected primitive or validation path.
  • Check debug, compatibility, fallback, and hostname or audience override settings in build and runtime configuration.

Remediate safely

  • Use a maintained platform cryptographic API with approved algorithms, modes, parameters, randomness, and full peer identity validation.
  • Remove insecure fallback and validation bypasses; separate keys by purpose and load them from managed secret storage.
  • Plan rotation or reissuance for affected keys, certificates, tokens, hashes, or ciphertext and document compatibility sequencing.

Authoritative sources

Complete CVE record and remediation plan

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