CVE-2021-3553

mediumpriority · track · 30EPSS 0.013 · 69 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.25% (69th) EPSS

CVSS 5 · medium

Is it mine?

11 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.15.3mediumAV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:Nsecondary · FSTEC (BDU) RU

v3.15.3mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:Nsecondary · ENISA EU

v3.15.3mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:Nsecondary · cve-requests@bitdefender.comexploitability 1.6 · impact 3.6

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-918USprimaryCWE-918US

affected products (11)

Products and version ranges known to be affected.

Bitdefender Endpoint Security Toolsunspecified → 6.6.27.390enisa_euvdEU
Bitdefender Endpoint Security Toolsunspecified → 7.1.2.33enisa_euvdEU
Bitdefender GravityZoneunspecified → 6.24.1-1enisa_euvdEU
Bitdefender Unified Endpoint for Linuxunspecified → 6.2.21.160enisa_euvdEU
Bitdefender Bitdefender Endpoint Security Tools for Windows (BEST)≤ 6.2.21.160fstec_bduRU
Bitdefender Bitdefender Endpoint Security Tools for Windows (BEST)6.6.27.0 → 6.6.27.390fstec_bduRU
Bitdefender Bitdefender Endpoint Security Tools for Windows (BEST)7.0.0.00 → 7.1.2.33fstec_bduRU
bitdefender endpoint security tools< 6.2.21.160nvdUScpe:2.3:a:bitdefender:endpoint_security_tools:*:*:*:*:*:*:*:*
bitdefender endpoint security tools6.6.27.0 → 6.6.27.390nvdUScpe:2.3:a:bitdefender:endpoint_security_tools:*:*:*:*:*:*:*:*
bitdefender endpoint security tools7.0.0.00 → 7.1.2.33nvdUScpe:2.3:a:bitdefender:endpoint_security_tools:*:*:*:*:*:*:*:*
bitdefender gravityzone= 6.24.1-1nvdUScpe:2.3:a:bitdefender:gravityzone:*:*:*:*:*:*:*:*

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2021-11-24modified 2026-06-17

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+4180 more

references (6)

External citations — patches, advisories, analysis.

scry

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