CVE-2021-36668Public exploit

Arbitrary NodeJS execution via port URL injection

Published Jul 11, 2022 · Updated Jul 9, 2026

URL injection in Druva inSync Client allows local users to execute arbitrary NodeJS code by manipulating the Electron UI port parameter. The UI concatenates the unvalidated port value after http://127.0.0.1:, so a value beginning with @ is parsed as URL user information and redirects the request to an attacker-selected host. Exploitation requires user-level device access and affects Windows and macOS 7.0.0 and earlier, plus Ubuntu Linux 5.9.2.

CVSS severity5.3
Medium
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

URL injection in Druva inSync Client allows local users to execute arbitrary NodeJS code by manipulating the Electron UI port parameter. The UI concatenates the unvalidated port value after http://127.0.0.1:, so a value beginning with @ is parsed as URL user information and redirects the request to an attacker-selected host. Exploitation requires user-level device access and affects Windows and macOS 7.0.0 and earlier, plus Ubuntu Linux 5.9.2.

The record

CVE
CVE-2021-36668
Published
Jul 11, 2022
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-74, T1203
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

4.6NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
5.3DruvaCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/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 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-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1203Exploitation for Client Execution

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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