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Vulnerability record · CVE-2021-3959 · published 16 December 2021

CVE-2021-3959: Bitdefender gravityzone server-side request forgery (ssrf) vulnerability

Bitdefender · Gravityzone

A Server-Side Request Forgery (SSRF) vulnerability in the EPPUpdateService component of Bitdefender Endpoint Security Tools allows an attacker to proxy requests to the relay server. This issue affects: Bitdefender Bitdefender GravityZone versions prior to 3.3.8.272

7.5 CVSS 3.1 High EPSS 1.7% · top 23.9% CWE-918 · Server-side request forgery (SSRF)
7.5CVSS 3.1 base score, v2 5.0
1.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

A Server-Side Request Forgery (SSRF) vulnerability in the EPPUpdateService component of Bitdefender Endpoint Security Tools allows an attacker to proxy requests to the relay server. This issue affects: Bitdefender Bitdefender GravityZone versions prior to 3.3.8.272

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.bitdefender.com/support/security-advisories/server-side-request-forgery-in-bitdefender-gravityzone-update-se Vendor Advisory
https://www.bitdefender.com/support/security-advisories/server-side-request-forgery-in-bitdefender-gravityzone-update-se Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-3959), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.