CVE-2021-45661

Local data disclosure and modification via injection

Published Dec 26, 2021 · Updated Aug 4, 2024

Server-side injection in affected NETGEAR Orbi firmware allows local users with low privileges to read and alter device data. NETGEAR has not published the affected component, input vector, or server-side operation that fails to neutralize attacker-controlled data. Exploitation requires local access and low privileges; the CNA assessment limits impact to confidentiality and integrity, with no availability effect.

CVSS severity7.1
High
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side injection in affected NETGEAR Orbi firmware allows local users with low privileges to read and alter device data. NETGEAR has not published the affected component, input vector, or server-side operation that fails to neutralize attacker-controlled data. Exploitation requires local access and low privileges; the CNA assessment limits impact to confidentiality and integrity, with no availability effect.

The record

CVE
CVE-2021-45661
Published
Dec 26, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-74
Attack vector
local
Privileges
authenticated

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 vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
7.1NETGEARCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
7.1MITRECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/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.

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

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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