CVE-2021-21739

MEDIUM
4.6
CVSS Score
Published: August 5, 2021 at 07:48 PM UTC
Updated: June 17, 2026 at 03:36 AM UTC
2 products affected across 1 vendorZxctn 6120H FirmwareZxctn 6120H

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Severity
MEDIUM4.6
Exploit prediction
EPSS 0.2%

Description

A ZTE's product of the transport network access layer has a security vulnerability. Because the system does not sufficiently verify the data reliability, attackers could replace an authenticated optical module on the equipment with an unauthenticated one, bypassing system authentication and detection, thus affecting signal transmission. This affects: <ZXCTN 6120H><V5.10.00B24>

Affected

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

All versions

Remediation

No guide yet

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

CVSS

Attack Vector
PHYSICAL
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-345

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