CVE-2020-35227Public exploitNetwork attack vector

Whitelist modification or reboot via overlong checkedList

Published Mar 10, 2021 · Updated Aug 4, 2024

Buffer overflow in NETGEAR JGS516PE and GS116Ev2 2.6.0.43 allows remote authenticated users to add IPs to the access whitelist. The access-control delete handler at /config/maintenance_ip_source.htm fails to validate checkedList length and interprets an overlong value as an address to add. Administrator-level web access and Plus Utility support are required; exploitation changes the whitelist or reboots the switch.

CVSS severity7.2
High
EPSS probability1.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in NETGEAR JGS516PE and GS116Ev2 2.6.0.43 allows remote authenticated users to add IPs to the access whitelist. The access-control delete handler at /config/maintenance_ip_source.htm fails to validate checkedList length and interprets an overlong value as an address to add. Administrator-level web access and Plus Utility support are required; exploitation changes the whitelist or reboots the switch.

The record

CVE
CVE-2020-35227
Published
Mar 10, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1562
Attack vector
network
Privileges
admin

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 vectornetwork
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.2NCC GroupCVSS:3.1/AV:N/AC:L/PR:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1562Impair Defenses

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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