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

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HIGH 8.8UPGRADEUPGRADEUPGRADE

CVE-2019-14656 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 do not properly check user roles in POST requests. Consequently, the default User account (with a password of user) can make admin requests via HTTP.

Why this priority

  • High severity
  • Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score8.8 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance2.0% (top 19%)
CISA exploited listNo
WeaknessCWE-434
Published2019-10-08
Last modified2026-06-17
Publisher (CNA): MITRE · Vendor: yeahlink

Share: LinkedIn · X · Reddit

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

Am I affected?

Timeline

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-2019-14656?

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-2019-14656 being exploited?

CVE-2019-14656 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-2019-14656 affect?

CVE-2019-14656 affects vp59 firmware, t49g firmware, t58v firmware. Severity is high (CVSS 8.8). Yealink phones through 2019-08-04 do not properly check user roles in POST requests. Consequently, the default User account (with a password of user) can make admin requests via HTTP.

How urgent is CVE-2019-14656?

Priority 56/100. High severity; Public exploit reference

Related CVEs

References

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