CVE-2019-14657

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-10-08 · updated 2026-06-17
Weakness: CWE-22

Description

Yealink phones through 2019-08-04 have an issue with OpenVPN file upload. They execute tar as root to extract files, but do not validate the extraction directory. Creating a tar file with ../../../../ allows replacement of almost any file on a phone. This leads to password replacement and arbitrary code execution as root.

Affected products

Yeahlink T49G Firmware: through 2019-08-04
Yeahlink T58V Firmware: through 2019-08-04
Yeahlink Vp59 Firmware: through 2019-08-04

References

http://cerebusforensics.com/yealink/exploit.html
https://sway.office.com/3pCb559LYVuT0eig
http://cerebusforensics.com/yealink/exploit.html
https://sway.office.com/3pCb559LYVuT0eig

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