CVE-2021-3553

Server-Side Request Forgery in EPPUpdateService remote config file (VA-9825)

5.3 Medium

A Server-Side Request Forgery (SSRF) vulnerability in the EPPUpdateService of Bitdefender Endpoint Security Tools allows an attacker to use the Endpoint Protection relay as a proxy for any remote host. This issue affects: Bitdefender Endpoint Security Tools versions prior to 6.6.27.390; versions prior to 7.1.2.33. Bitdefender Unified Endpoint for Linux versions prior to 6.2.21.160. Bitdefender GravityZone versions prior to 6.24.1-1.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: None
Availability: None

Exploit likelihood

1.25%Up 0.8 points since Nov 25, 2021

What each source reports

CVE List Score used 5.3

Server-Side Request Forgery in EPPUpdateService remote config file (VA-9825)

Record: CVE-2021-3553
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Weakness: CWE-918
Updated: 2026-11-02

EUVDEUVD-2021-26864 5.3

Record: EUVD-2021-26864
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Updated: 2026-11-03

GitHub AdvisoriesGHSA-6x2g-jp65-m547 No score

A Server-Side Request Forgery (SSRF) vulnerability in the EPPUpdateService of Bitdefender...

Record: GHSA-6x2g-jp65-m547
Weakness: CWE-918
Updated: 2026-11-02

NVD 5.3

Record: CVE-2021-3553
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:P/I:N/A:N
Weakness: CWE-918
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-3553 is a medium vulnerability (CVSS 5.3) in Bitdefender Endpoint Security Tools, published November 24, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.25%, the 69th percentile. No source names a fixed version.