CVE-2021-44255Public exploitNetwork attack vector

Authenticated code execution via malicious pickle restore

Published Jan 31, 2022 · Updated Aug 4, 2024

Unsafe deserialization in motionEye 0.42.1 and earlier and motionEyeOS 20200606 and earlier allows remote authenticated users to execute code. The configuration-restore path accepts an uploaded backup containing tasks.pickle, writes it to disk, and later loads it with Python pickle without restricting object reconstruction. Administrative web access is required; loading the restored task data invokes attacker-controlled reduction code with the motionEye service account privileges.

CVSS severity7.2
High
EPSS probability3.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in motionEye 0.42.1 and earlier and motionEyeOS 20200606 and earlier allows remote authenticated users to execute code. The configuration-restore path accepts an uploaded backup containing tasks.pickle, writes it to disk, and later loads it with Python pickle without restricting object reconstruction. Administrative web access is required; loading the restored task data invokes attacker-controlled reduction code with the motionEye service account privileges.

The record

CVE
CVE-2021-44255
Published
Jan 31, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-306, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 31, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1190Exploit Public-Facing Application

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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