CVE-2026-4478Public exploitNetwork attack vector

Unauthenticated firmware replacement via missing signature verification

Published Mar 20, 2026 · Updated Mar 20, 2026

Improper signature verification in YI Home Camera 2 2.1.1_20171024151200 allows remote attackers to install untrusted firmware. The HTTP firmware update handler in home/web/ipc accepts firmware without correctly verifying its cryptographic signature. The request needs no authentication but has high attack complexity; a successful update can compromise camera confidentiality, integrity, and availability.

CVSS severity8.1
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper signature verification in YI Home Camera 2 2.1.1_20171024151200 allows remote attackers to install untrusted firmware. The HTTP firmware update handler in home/web/ipc accepts firmware without correctly verifying its cryptographic signature. The request needs no authentication but has high attack complexity; a successful update can compromise camera confidentiality, integrity, and availability.

The record

CVE
CVE-2026-4478
Published
Mar 20, 2026
Updated
Mar 20, 2026
Vendor
YI Technology
Product
YI Home Camera
Classifications
CWE-345, CWE-347, T1601.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 2026Record 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2 2.1.1_20171024151200

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

YI Technology · YI Home Cameraversion=2 2.1.1_20171024151200

Published CVSS scores

8.1VulDBCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
7.6VulDBAV:N/AC:H/Au:N/C:C/I:C/A:C
8.2VulDBCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
CWE-347Improper Verification of Cryptographic Signature
T1601.001Modify System Image: Patch System Image

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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