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CVE-2020-5686

HIGH
7.5
CVSS Score
Published: January 13, 2021 at 09:40 AM UTC
Updated: June 17, 2026 at 03:22 AM UTC
4 products affected across 1 vendorUniverge SV9500 FirmwareUniverge SV8500 FirmwareUNIVERGE SV9500

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Severity
HIGH7.5
Exploit prediction
EPSS 1%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Univerge SV8500 Firmware· NEC
95%
s6 ≤ v ≤ s8
nec-univerge-sv8500 (same device)
Univerge SV9500 Firmware· NEC
95%
v1 ≤ v ≤ v7
nec-univerge-sv9500 (same device)
UNIVERGE SV8500· NEC
60%
v ≥ 1
UNIVERGE SV9500· NEC
60%
v ≥ 1

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCThird Party Advisory
Source: [email protected]
https://jvn.jp/en/jp/JVN38784555/index.html
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.necplatforms.co.jp/en/press/security_adv.html

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-287

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