CVE-2019-9971

Name: CVE-2019-9971
Creator: NVD / NIST
Published: 2022-06-07T18:15:10.187+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.57%

Last modified Jun 17, 2026

CVE-2019-9971 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 1.57% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.57%

72.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-269

Affected Software

Vendor	Product	Versions
3cx	Phone System Firmware	16.0.0.1570
Debian	Debian Linux	All versions

References

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

Timeline

Published: Jun 7, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-9971?

How severe is CVE-2019-9971?

CVE-2019-9971 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.57% probability of exploitation in the next 30 days.

How do I fix CVE-2019-9971?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

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Source: NVD / NIST