CVE-2020-35233Public exploit

Switch reboot via concurrent TFTP operations

Published Mar 10, 2021 · Updated Aug 4, 2024

Denial of service in NETGEAR JGS516PE and GS116Ev2 2.6.0.43 allows remote attackers to reboot switches via concurrent TFTP connections. The TFTP update process fails to coordinate concurrent operations, so simultaneous TFTP requests or web-panel access during an update reboots the device. Exploitation requires adjacent-network access and enabled Plus Utility support; repeated requests can keep the switch unavailable.

CVSS severity6.5
Medium
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

Denial of service in NETGEAR JGS516PE and GS116Ev2 2.6.0.43 allows remote attackers to reboot switches via concurrent TFTP connections. The TFTP update process fails to coordinate concurrent operations, so simultaneous TFTP requests or web-panel access during an update reboots the device. Exploitation requires adjacent-network access and enabled Plus Utility support; repeated requests can keep the switch unavailable.

The record

CVE
CVE-2020-35233
Published
Mar 10, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, T1499.004
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

6.1NIST NVDAV:A/AC:L/Au:N/C:N/I:N/A:C
6.5NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

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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