CVE-2021-3959: Server-Side Request Forgery in Bitdefender GravityZone Update Server in Relay Mode (VA-10145)

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-12-16 · updated 2026-06-17
Weakness: CWE-918

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

Affected products

Bitdefender GravityZone: before 3.3.8.272 — fixed in 3.3.8.272

How to fix

Upgrade to a fixed version: Bitdefender GravityZone 3.3.8.272. Check the vendor advisory for mitigations.

References

https://www.bitdefender.com/support/security-advisories/server-side-request-forgery-in-bitdefender-gravityzone-update-server-in-relay-mode-va-10145
https://www.bitdefender.com/support/security-advisories/server-side-request-forgery-in-bitdefender-gravityzone-update-server-in-relay-mode-va-10145

Get alerted when CVE-2021-3959 or the next vulnerability affects your stack