CVE intelligence and bounded remediation

CVE-2019-18863 — Mitel 6863I Firmware security vulnerability

Medium CVSS 5.9

A key length vulnerability in the implementation of the SRTP 128-bit key on Mitel 6800 and 6900 SIP series phones, versions 5.1.0.2051 SP2 and earlier, could allow an attacker to launch a man-in-the-middle attack when SRTP is used in a call. A successful exploit may allow the attacker to intercept sensitive information.

Severity
Medium
CVSS
5.9 (3.1)
Published
2020-03-02
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-326

Affected products

  • mitel / 6863i_firmware
  • mitel / 6863i_firmware / 5.1.0.2051
  • mitel / 6865i_firmware
  • mitel / 6865i_firmware / 5.1.0.2051
  • mitel / 6867i_firmware
  • mitel / 6867i_firmware / 5.1.0.2051

Showing 6 representative product identities from 24 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Cryptography, certificate, signature, and channel validation

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

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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