CVE-2022-21134Network attack vector

Firmware replacement via CRC32-only integrity check

Published Jan 28, 2022 · Updated Apr 15, 2025

Improper firmware verification in Reolink RLC-410W 3.0.0.136_20121102 allows attackers to install modified firmware via HTTP. The update binary accepts firmware whose authenticity is protected only by a CRC32 check, not a cryptographic signature. Reachability requires either administrator access to the Upgrade API or a man-in-the-middle position during a legitimate update; exploitation permits persistent firmware modification, including backdoor insertion.

CVSS severity8.3
High
EPSS probability0.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper firmware verification in Reolink RLC-410W 3.0.0.136_20121102 allows attackers to install modified firmware via HTTP. The update binary accepts firmware whose authenticity is protected only by a CRC32 check, not a cryptographic signature. Reachability requires either administrator access to the Upgrade API or a man-in-the-middle position during a legitimate update; exploitation permits persistent firmware modification, including backdoor insertion.

The record

CVE
CVE-2022-21134
Published
Jan 28, 2022
Updated
Apr 15, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-347, T1601.001
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Jan 28, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.3Cisco TalosCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
10.0Cisco TalosCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
T1601.001Patch System Image

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo