CVE-2021-36665Public exploit

Root code execution via unsafe package deserialization

Published Jul 11, 2022 · Updated Jul 9, 2026

Insecure deserialization in Druva inSync Client before 7.0.0 allows local users to execute arbitrary code with root privileges on Windows and macOS. The inSyncPackage.py load method passes an attacker-supplied upgrade-package header to Pickle.loads before the package signature establishes trust. User-level local access is required to redirect the upgrade source and supply a malicious package, after which the root-running upgrade path executes attacker-controlled code.

CVSS severity7.5
High
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insecure deserialization in Druva inSync Client before 7.0.0 allows local users to execute arbitrary code with root privileges on Windows and macOS. The inSyncPackage.py load method passes an attacker-supplied upgrade-package header to Pickle.loads before the package signature establishes trust. User-level local access is required to redirect the upgrade source and supply a malicious package, after which the root-running upgrade path executes attacker-controlled code.

The record

CVE
CVE-2021-36665
Published
Jul 11, 2022
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-502, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 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 vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.2NVDAV:L/AC:L/Au:N/C:C/I:C/A:C
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.5DruvaCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1068Exploitation for Privilege Escalation

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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