HOMEVULNERABILITIESCVE-2019-9971
HIGH

CVE-2019-9971

CWE-269Published: June 7, 2022· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official Description

PhoneSystem Terminal in 3CX Phone System (Debian based installation) 16.0.0.1570 allows an attacker to gain root privileges by using sudo with the tcpdump command, without a password. This occurs because the -z (aka postrotate-command) option to tcpdump can be unsafe when used in conjunction with sudo.

NVD Source

Technical Analysis

CVE-2019-9971 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

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 8.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

3cx2 product(s)
phone system firmwarephone system
Debian1 product(s)
debian linux
Source: NVD CPE · 3 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

ADVISORYhttps://www.gosecure.net/blog
ADVISORYhttps://www.gosecure.net/blog/2022/05/31/security-advisory-multiple-vulnerabilities-impact-3cx-phone-system/
ADVISORYhttps://www.securusglobal.com/community/2014/03/17/how-i-got-root-with-sudo/
ADVISORYhttps://www.gosecure.net/blog
ADVISORYhttps://www.gosecure.net/blog/2022/05/31/security-advisory-multiple-vulnerabilities-impact-3cx-phone-system/
ADVISORYhttps://www.securusglobal.com/community/2014/03/17/how-i-got-root-with-sudo/

All References (6)

→
https://www.gosecure.net/blogThird Party Advisory
→
https://www.gosecure.net/blog/2022/05/31/security-advisory-multiple-vulnerabilities-impact-3cx-phone-system/Exploit · Third Party Advisory
→
https://www.securusglobal.com/community/2014/03/17/how-i-got-root-with-sudo/Third Party Advisory
→
https://www.gosecure.net/blogThird Party Advisory
→
https://www.gosecure.net/blog/2022/05/31/security-advisory-multiple-vulnerabilities-impact-3cx-phone-system/Exploit · Third Party Advisory
→
https://www.securusglobal.com/community/2014/03/17/how-i-got-root-with-sudo/Third Party Advisory

Quick Facts

CVE IDCVE-2019-9971
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-269
CISA KEVNo
Affected2 vendor(s)
PublishedJun 7, 2022

Related CVEs (CWE-269)

CVE-2020-27655
10.0
CVE-2025-0505
10.0
CVE-2021-1388
10.0
CVE-2018-4310
10.0
CVE-2022-24783
10.0
CVE-2026-31852
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-9971 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.
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