HOMEVULNERABILITIESCVE-2022-29855
MEDIUM

CVE-2022-29855

NVD-CWE-OtherPublished: May 11, 2022· Updated: Jun 17, 2026

6.8
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2022-29855 requires local access, meaning attackers must already have a foothold on the target system.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 6.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorPhysical
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

mitel18 product(s)
6873i sip firmware6873i sip6930 sip firmware6930 sip6940 sip firmware6940 sip6865i sip firmware6865i sip6867i sip firmware6867i sip6869i sip firmware6869i sip+6
Source: NVD CPE · 18 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://packetstormsecurity.com/files/167547/Mitel-6800-6900-Series-SIP-Phones-Backdoor-Access.html
ADVISORYhttp://seclists.org/fulldisclosure/2022/Jun/32
ADVISORYhttps://www.mitel.com/support/security-advisories
ADVISORYhttps://www.mitel.com/support/security-advisories/mitel-product-security-advisory-22-0004
ADVISORYhttps://www.syss.de/pentest-blog/undocumented-functionality-backdoor-in-mitel-desk-phones-syss-2022-021
ADVISORYhttp://packetstormsecurity.com/files/167547/Mitel-6800-6900-Series-SIP-Phones-Backdoor-Access.html
ADVISORYhttp://seclists.org/fulldisclosure/2022/Jun/32
ADVISORYhttps://www.mitel.com/support/security-advisories
ADVISORYhttps://www.mitel.com/support/security-advisories/mitel-product-security-advisory-22-0004
ADVISORYhttps://www.syss.de/pentest-blog/undocumented-functionality-backdoor-in-mitel-desk-phones-syss-2022-021

All References (10)

→
http://packetstormsecurity.com/files/167547/Mitel-6800-6900-Series-SIP-Phones-Backdoor-Access.htmlExploit · Third Party Advisory · VDB Entry
→
http://seclists.org/fulldisclosure/2022/Jun/32Exploit · Mailing List · Third Party Advisory
→
https://www.mitel.com/support/security-advisoriesVendor Advisory
→
https://www.mitel.com/support/security-advisories/mitel-product-security-advisory-22-0004Vendor Advisory
→
https://www.syss.de/pentest-blog/undocumented-functionality-backdoor-in-mitel-desk-phones-syss-2022-021Third Party Advisory
→
http://packetstormsecurity.com/files/167547/Mitel-6800-6900-Series-SIP-Phones-Backdoor-Access.htmlExploit · Third Party Advisory · VDB Entry
→
http://seclists.org/fulldisclosure/2022/Jun/32Exploit · Mailing List · Third Party Advisory
→
https://www.mitel.com/support/security-advisoriesVendor Advisory
→
https://www.mitel.com/support/security-advisories/mitel-product-security-advisory-22-0004Vendor Advisory
→
https://www.syss.de/pentest-blog/undocumented-functionality-backdoor-in-mitel-desk-phones-syss-2022-021Third Party Advisory

Quick Facts

CVE IDCVE-2022-29855
CVSS Score6.8 / 10
SeverityMEDIUM
WeaknessNVD-CWE-Other
CISA KEVNo
Affected1 vendor(s)
PublishedMay 11, 2022

Related CVEs (NVD-CWE-Other)

CVE-2006-6859
10.0
CVE-2003-0509
10.0
CVE-1999-0789
10.0
CVE-2007-1015
10.0
CVE-2007-1021
10.0
CVE-2006-1123
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2022-29855 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2022-29855·NVD