What is CVE-2021-36668?

CVE-2021-36668 is a high-severity vulnerability in Druva Insync Client, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.8/10. Published 2022-07-12.

How severe is CVE-2021-36668?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Druva Insync Client

CVE-2021-36668

URL injection in Driva inSync 6.9.0 for MacOS, allows attackers to force a visit to an arbitrary url via the port parameter to the Electron App.

Published 2022-07-12 · last modified 2026-07-09.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (45.4th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Druva Insync Client

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

af854a3a-2127-422b-91ae-364da2661108 (Product)
docs.druva.com/Knowledge_Base/Security_Update/Security_Advisory_for_inSync_Clie… (Vendor Advisory)
imhotepisinvisible.com/druva-lpe/ (Technical Description, Exploit, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-36668?: CVE-2021-36668 is a high-severity vulnerability in Druva Insync Client, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.8/10. Published 2022-07-12.
How severe is CVE-2021-36668?: High severity. CVSS v3 base score is 7.8 out of 10.