CVE-2022-29855: Mitel 6865i SIP Firmware

Medium severity, CVSS 6.8. EPSS: 0.8% chance of exploitation in the next 30 days.

Mitel 6800 and 6900 Series SIP phone devices through 2022-04-27 have "undocumented functionality." A vulnerability in Mitel 6800 Series and 6900 Series SIP phones excluding 6970, versions 5.1 SP8 (5.1.0.8016) and earlier, and 6.0 (6.0.0.368) through 6.1 HF4 (6.1.0.165), could allow a unauthenticated attacker with physical access to the phone to gain root access due to insufficient access control for test functionality during system startup. A successful exploit could allow access to sensitive information and code execution.

Affected products

• Mitel 6865i SIP Firmware: before 5.1.0.8017 (fixed in 5.1.0.8017); from 6.0.0.368, before 6.1.0.171 (fixed in 6.1.0.171)
• Mitel 6867i SIP Firmware: before 5.1.0.8017 (fixed in 5.1.0.8017); from 6.0.0.368, before 6.1.0.171 (fixed in 6.1.0.171)
• Mitel 6869i SIP Firmware: before 5.1.0.8017 (fixed in 5.1.0.8017); from 6.0.0.368, before 6.1.0.171 (fixed in 6.1.0.171)
• Mitel 6873i SIP Firmware: before 5.1.0.8017 (fixed in 5.1.0.8017); from 6.0.0.368, before 6.1.0.171 (fixed in 6.1.0.171)
• Mitel 6905 SIP Firmware: up to and including 5.1.0.8016; from 6.0.0.368, up to and including 6.1.0.165
• Mitel 6910 SIP Firmware: up to and including 5.1.0.8016; from 6.0.0.368, up to and including 6.1.0.165
• Mitel 6920 SIP Firmware: up to and including 5.1.0.8016; from 6.0.0.368, up to and including 6.1.0.165
• Mitel 6930 SIP Firmware: before 5.1.0.8017 (fixed in 5.1.0.8017); from 6.0.0.368, before 6.1.0.171 (fixed in 6.1.0.171)
• Mitel 6940 SIP Firmware: before 5.1.0.8017 (fixed in 5.1.0.8017); from 6.0.0.368, before 6.1.0.171 (fixed in 6.1.0.171)

Published 2022-05-11. Last modified 2026-06-17.