CVE-2020-6863

Unauthenticated router service interruption

Published Feb 27, 2020 · Updated Aug 4, 2024

Access-control failure in ZTE E8820V3 firmware through 3.1.0.1000.4 allows remote attackers to interrupt service via a crafted URL. The affected DDNS request path accepts unauthenticated parameter changes and a denial-of-service request, but ZTE has not disclosed the URL, request fields, or failed authorization operation. Access is limited to the router's adjacent network, and the published impact is service interruption without reported confidentiality loss.

CVSS severity4.1
Medium
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Access-control failure in ZTE E8820V3 firmware through 3.1.0.1000.4 allows remote attackers to interrupt service via a crafted URL. The affected DDNS request path accepts unauthenticated parameter changes and a denial-of-service request, but ZTE has not disclosed the URL, request fields, or failed authorization operation. Access is limited to the router's adjacent network, and the published impact is service interruption without reported confidentiality loss.

The record

CVE
CVE-2020-6863
Published
Feb 27, 2020
Updated
Aug 4, 2024
Vendor
ZTE Corporation
Product
E8820V3
Classifications
T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 27, 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=All versions up to V3.1.0.1000.4

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

ZTE Corporation · E8820V3version=All versions up to V3.1.0.1000.4

Published CVSS scores

4.1ZTE CorporationCVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
6.5NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.3NIST NVDAV:A/AC:L/Au:N/C:N/I:N/A:P

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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