CVE-2019-20031

Name: CVE-2019-20031
Creator: NVD / NIST
Published: 2020-07-29T18:15:13.75+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 1.00%

Last modified Jun 17, 2026

CVE-2019-20031 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. NEC UM8000, UM4730 and prior non-InMail voicemail systems with all known software versions may permit an infinite number of login attempts in the telephone user interface (TUI), effectively allowing brute force attacks.. EPSS estimates a 1.00% chance of exploitation in the next 30 days.

Description

NEC UM8000, UM4730 and prior non-InMail voicemail systems with all known software versions may permit an infinite number of login attempts in the telephone user interface (TUI), effectively allowing brute force attacks.

Metrics

CVSS 3.1

9.1/10

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

EPSS Probability

1.00%

58.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-307

Affected Software

Vendor	Product	Versions
Nec	Um8000 Firmware	All versions
Nec	Um4730 Firmware	All versions

References

https://shadytel.su/files/nec_cve.txtThird Party Advisory
https://shadytel.su/files/nec_cve.txtThird Party Advisory

Timeline

Published: Jul 29, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-20031?

How severe is CVE-2019-20031?

CVE-2019-20031 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 1.00% probability of exploitation in the next 30 days.

How do I fix CVE-2019-20031?

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.

Are you affected by CVE-2019-20031?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST