CVE-2021-45518

Adjacent-network denial of service

Published Dec 26, 2021 · Updated Aug 4, 2024

Denial of service in NETGEAR XR1000 firmware before 1.0.0.58 allows remote attackers to interrupt service via adjacent-network access. NETGEAR has not published the vulnerable component or the malformed input operation that causes the device to become unavailable. The attack requires network adjacency and unauthenticated access; the documented consequence is service interruption without reported confidentiality or integrity impact.

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 remote attackers to interrupt service via adjacent-network access. NETGEAR has not published the vulnerable component or the malformed input operation that causes the device to become unavailable. The attack requires network adjacency and unauthenticated access; the documented consequence is service interruption without reported confidentiality or integrity impact.

The record

CVE
CVE-2021-45518
Published
Dec 26, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499
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

6.5NETGEARCVSS: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.

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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 exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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