CVE-2020-5686

Name: CVE-2020-5686
Creator: NVD / NIST
Published: 2021-01-13T10:15:15.097+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.16%

Last modified Jun 17, 2026

CVE-2020-5686 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Incorrect implementation of authentication algorithm issue in UNIVERGE SV9500 series from V1 to V7and SV8500 series from S6 to S8 allows an attacker to access the remote system maintenance feature and obtain the information by sending a specially crafted request to a specific URL.. EPSS estimates a 1.16% chance of exploitation in the next 30 days.

Description

Incorrect implementation of authentication algorithm issue in UNIVERGE SV9500 series from V1 to V7and SV8500 series from S6 to S8 allows an attacker to access the remote system maintenance feature and obtain the information by sending a specially crafted request to a specific URL.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.16%

63.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Nec	Univerge Sv9500 Firmware	>= v1, <= v7
Nec	Univerge Sv8500 Firmware	>= s6, <= s8

References

https://jvn.jp/en/jp/JVN38784555/index.htmlThird Party Advisory
https://www.necplatforms.co.jp/en/press/security_adv.htmlVendor Advisory
https://jvn.jp/en/jp/JVN38784555/index.htmlThird Party Advisory
https://www.necplatforms.co.jp/en/press/security_adv.htmlVendor Advisory

Timeline

Published: Jan 13, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-5686?

How severe is CVE-2020-5686?

CVE-2020-5686 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.16% probability of exploitation in the next 30 days.

How do I fix CVE-2020-5686?

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-2020-5686?

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

Scan your code now

Source: NVD / NIST