CVE-2022-46423Public exploitNetwork attack vector

Arbitrary code execution via zero-CRC firmware replacement

Published Dec 20, 2022 · Updated Apr 17, 2025

Firmware integrity bypass in NETGEAR WNR2000v1 1.2.3.7 and earlier allows man-in-the-middle attackers to install arbitrary code. The firmware update function accepts a customized image whose CRC checksum equals zero, while plain HTTP permits replacement of a user-uploaded image in transit. The attack requires a privileged network position and a user to initiate a firmware upload; success installs attacker-controlled firmware or interrupts router service.

CVSS severity8.1
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Firmware integrity bypass in NETGEAR WNR2000v1 1.2.3.7 and earlier allows man-in-the-middle attackers to install arbitrary code. The firmware update function accepts a customized image whose CRC checksum equals zero, while plain HTTP permits replacement of a user-uploaded image in transit. The attack requires a privileged network position and a user to initiate a firmware upload; success installs attacker-controlled firmware or interrupts router service.

The record

CVE
CVE-2022-46423
Published
Dec 20, 2022
Updated
Apr 17, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-494, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 20, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 17, 2025Record 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.1NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-494Download of Code Without Integrity Check
T1557Adversary-in-the-Middle

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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