CVE-2022-40620

Arbitrary code execution via TLS-disabled unsigned updates

Published Jan 28, 2026 · Updated Jan 28, 2026

Improper certificate validation in FunJSQ on affected NETGEAR firmware allows man-in-the-middle attackers to execute arbitrary code. The funjsq.sh auto-update path invokes curl with certificate checks disabled, trusts an MD5 value delivered over the same intercepted channel, and extracts the unsigned archive into the root filesystem with elevated privileges. Exploitation requires the router's Wi-Fi password or an Ethernet connection, and successful package substitution permits overwrite of device files and code execution.

CVSS severity7.7
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in FunJSQ on affected NETGEAR firmware allows man-in-the-middle attackers to execute arbitrary code. The funjsq.sh auto-update path invokes curl with certificate checks disabled, trusts an MD5 value delivered over the same intercepted channel, and extracts the unsigned archive into the root filesystem with elevated privileges. Exploitation requires the router's Wi-Fi password or an Ethernet connection, and successful package substitution permits overwrite of device files and code execution.

The record

CVE
CVE-2022-40620
Published
Jan 28, 2026
Updated
Jan 28, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-295, T1557
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 28, 2026Record 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

7.7CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
7.7NETGEARCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

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

CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

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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