CVE-2021-36666Public exploit

Root privilege escalation via dynamic library injection

Published Jul 11, 2022 · Updated Jul 9, 2026

Code injection in Druva inSync Client before 7.0.0 allows local users to gain root privileges through a malicious dynamic library. The macOS app's entitlements exempt loaded libraries from hardened-runtime protections, so DYLD_INSERT_LIBRARIES injects code that reads its Keychain RPC secret. A user-level account can then authenticate to the root inSyncDecommission RPC service and invoke arbitrary file read and write methods.

CVSS severity7.5
High
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Druva inSync Client before 7.0.0 allows local users to gain root privileges through a malicious dynamic library. The macOS app's entitlements exempt loaded libraries from hardened-runtime protections, so DYLD_INSERT_LIBRARIES injects code that reads its Keychain RPC secret. A user-level account can then authenticate to the root inSyncDecommission RPC service and invoke arbitrary file read and write methods.

The record

CVE
CVE-2021-36666
Published
Jul 11, 2022
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-426, T1574.006
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

7.2NIST NVDAV:L/AC:L/Au:N/C:C/I:C/A:C
7.8NIST NVDCVSS: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-426Untrusted Search Path
T1574.006Hijack Execution Flow: Dynamic Linker Hijacking

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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