CVE-2020-6870

Authenticated file tampering through faulty FTP access

Published Jun 24, 2020 · Updated Aug 4, 2024

Improper access control in ZTE NetNumen U31 R20 V12.17.20T115 allows remote authenticated users to alter FTP-hosted files. ZTE identifies a design error that permits FTP login and password tampering but does not disclose the affected component or faulty operation. Adjacent-network access and low privileges are required; exploitation permits file download, modification, upload, or deletion and can disrupt managed equipment.

CVSS severity8.2
High
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in ZTE NetNumen U31 R20 V12.17.20T115 allows remote authenticated users to alter FTP-hosted files. ZTE identifies a design error that permits FTP login and password tampering but does not disclose the affected component or faulty operation. Adjacent-network access and low privileges are required; exploitation permits file download, modification, upload, or deletion and can disrupt managed equipment.

The record

CVE
CVE-2020-6870
Published
Jun 24, 2020
Updated
Aug 4, 2024
Vendor
ZTE Corporation
Product
NetNumen U31
Classifications
Unavailable
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=V12.17.20T115

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

ZTE Corporation · NetNumen U31version=V12.17.20T115

Published CVSS scores

5.2NIST NVDAV:A/AC:L/Au:S/C:P/I:P/A:P
8.2ZTE CorporationCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H
8.0NIST NVDCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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