CVE-2019-20656

Authenticated device data access and modification

Published Apr 15, 2020 · Updated Aug 5, 2024

Hard-coded credentials in NETGEAR D6200 and 14 router or gateway firmware lines allow remote authenticated users to read and alter device data. NETGEAR has not disclosed the credential, the firmware component that embeds it, or the authentication path that accepts it. Exploitation requires adjacent-network access, low-privilege access, and high-complexity conditions; successful use compromises confidentiality and integrity without a reported service interruption.

CVSS severity6.4
Medium
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hard-coded credentials in NETGEAR D6200 and 14 router or gateway firmware lines allow remote authenticated users to read and alter device data. NETGEAR has not disclosed the credential, the firmware component that embeds it, or the authentication path that accepts it. Exploitation requires adjacent-network access, low-privilege access, and high-complexity conditions; successful use compromises confidentiality and integrity without a reported service interruption.

The record

CVE
CVE-2019-20656
Published
Apr 15, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-798, T1078
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 15, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.4NETGEARCVSS:3.0/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
8.8NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.3NIST NVDAV:A/AC:L/Au:N/C:P/I:N/A:N

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 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

CWE-798Use of Hard-coded Credentials
T1078Valid Accounts

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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