CVE-2021-3616Network attack vector

Unauthenticated firmware modification via improper authorization

Published Aug 17, 2021 · Updated Aug 3, 2024

Improper authorization in Lenovo Smart Camera X3, X5, and C2E firmware before 01.03.29.16 allows remote attackers to read data and alter firmware. Lenovo has not published the affected interface or the exact authorization check that improperly permits access to device information, firmware content, and configuration. No authentication or user interaction is required; successful access exposes device information and permits changes to camera operation.

CVSS severity9.4
Critical
EPSS probability0.92%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Lenovo Smart Camera X3, X5, and C2E firmware before 01.03.29.16 allows remote attackers to read data and alter firmware. Lenovo has not published the affected interface or the exact authorization check that improperly permits access to device information, firmware content, and configuration. No authentication or user interaction is required; successful access exposes device information and permits changes to camera operation.

The record

CVE
CVE-2021-3616
Published
Aug 17, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-285, T1601
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 17, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.4Lenovo Group Ltd.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-285Improper Authorization
T1601Modify 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

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Your stack

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