CVE-2021-3552Network attack vector

Unauthenticated SSRF via insufficient regex validation

Published Nov 24, 2021 · Updated Sep 16, 2024

SSRF in Bitdefender Endpoint Security Tools before 6.6.27.390 or before 7.1.2.33 allows remote attackers to proxy relay requests. The EPPUpdateService configuration parser insufficiently validates a regular expression, allowing crafted configuration data to redirect requests through the relay. The network path requires no authentication or user interaction; GravityZone 6.24.1-1 is also affected, and the published impact is limited to relay-accessible data.

CVSS severity5.3
Medium
EPSS probability1.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Bitdefender Endpoint Security Tools before 6.6.27.390 or before 7.1.2.33 allows remote attackers to proxy relay requests. The EPPUpdateService configuration parser insufficiently validates a regular expression, allowing crafted configuration data to redirect requests through the relay. The network path requires no authentication or user interaction; GravityZone 6.24.1-1 is also affected, and the published impact is limited to relay-accessible data.

The record

CVE
CVE-2021-3552
Published
Nov 24, 2021
Updated
Sep 16, 2024
Vendor
Bitdefender
Product
GravityZone
Classifications
CWE-918, T1090
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 24, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.24.1-1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Bitdefender · GravityZoneversion=6.24.1-1
Bitdefender · Bitdefender Endpoint Security Toolsversion=unspecified <6.6.27.390; version=unspecified <7.1.2.33

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
5.3BitdefenderCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1090Proxy

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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