CVE-2019-14657: Yealink phones through 2019-08-04 have an issue with OpenVPN file upload

Q: How do I fix CVE-2019-14657?

vp59 firmware: upgrade to newer than 2019-08-04; t49g firmware: upgrade to newer than 2019-08-04; t58v firmware: upgrade to newer than 2019-08-04. Exact commands for each OS are on this page.

Q: Is CVE-2019-14657 being exploited?

CVE-2019-14657 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-14657 affect?

CVE-2019-14657 affects vp59 firmware, t49g firmware, t58v firmware. Severity is high (CVSS 8.8). 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 o

Q: How urgent is CVE-2019-14657?

Priority 58/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADEUPGRADEUPGRADE

CVE-2019-14657 is a high-severity flaw (CVSS 8.8) affecting vp59 firmware, t49g firmware, t58v firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	3.7% (top 10%)
CISA exploited list	No
Weakness	CWE-22, CWE-434
Published	2019-10-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: yeahlink

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-10-08 13:15 UTCPublished CVE record published
2026-06-17 02:18 UTCUpdated Record last modified

yeahlink vp59 firmware UPGRADE

Affected: <= 2019-08-04

Fixed in: newer than 2019-08-04

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

yeahlink t49g firmware UPGRADE

Affected: <= 2019-08-04

Fixed in: newer than 2019-08-04

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

yeahlink t58v firmware UPGRADE

Affected: <= 2019-08-04

Fixed in: newer than 2019-08-04

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-14657?

vp59 firmware: upgrade to newer than 2019-08-04; t49g firmware: upgrade to newer than 2019-08-04; t58v firmware: upgrade to newer than 2019-08-04. Exact commands for each OS are on this page.

Is CVE-2019-14657 being exploited?

CVE-2019-14657 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-14657 affect?

CVE-2019-14657 affects vp59 firmware, t49g firmware, t58v firmware. Severity is high (CVSS 8.8). 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 o

How urgent is CVE-2019-14657?

Priority 58/100. High severity; Public exploit reference

Software pages

OpenVPN vulnerabilities

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CVE-2019-14656 HIGH 8.8 UPGRADE UPGRADE Yealink phones through 2019-08-04 do not properly check user roles in POST requests

References

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