CVE-2021-45517

Unauthenticated adjacent-network service interruption

Published Dec 26, 2021 · Updated Aug 4, 2024

Denial of service in NETGEAR XR1000 firmware before 1.0.0.58 allows attackers to interrupt router service over an adjacent network. NETGEAR has not disclosed the affected firmware component, the triggering input, or whether the failure causes a hang, crash, or reboot. Exploitation requires adjacent-network access but no authentication or user interaction; the documented consequence is limited to loss of availability.

CVSS severity6.5
Medium
EPSS probability0.37%
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 XR1000 firmware before 1.0.0.58 allows attackers to interrupt router service over an adjacent network. NETGEAR has not disclosed the affected firmware component, the triggering input, or whether the failure causes a hang, crash, or reboot. Exploitation requires adjacent-network access but no authentication or user interaction; the documented consequence is limited to loss of availability.

The record

CVE
CVE-2021-45517
Published
Dec 26, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 26, 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

6.1NVDAV:A/AC:L/Au:N/C:N/I:N/A:C
6.5NETGEARCVSS: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.

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

No sourced classifications are available.

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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