CVE-2020-35226Public exploit

Unauthenticated DHCP changes via unchecked NSDP command

Published Mar 10, 2021 · Updated Aug 4, 2024

Missing authentication in NETGEAR JGS516PE and GS116Ev2 2.6.0.43 allows remote attackers to alter DHCP settings through NSDP. NSDP command 0x0b treats values 0 and 1 as configuration writes without applying access control, although value 3 is the status query. An attacker on the adjacent network can enable or disable DHCP when Plus Utility support is enabled, forcing repeated lease requests or interrupting switch network service.

CVSS severity7.1
High
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in NETGEAR JGS516PE and GS116Ev2 2.6.0.43 allows remote attackers to alter DHCP settings through NSDP. NSDP command 0x0b treats values 0 and 1 as configuration writes without applying access control, although value 3 is the status query. An attacker on the adjacent network can enable or disable DHCP when Plus Utility support is enabled, forcing repeated lease requests or interrupting switch network service.

The record

CVE
CVE-2020-35226
Published
Mar 10, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-306
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 10, 2021CVE 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.8NIST NVDAV:A/AC:L/Au:N/C:N/I:P/A:P
7.1NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

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 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 exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function

Public exploit references

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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