Security readout for executives and security teams
Plain-English summary
This flaw lets an unauthenticated network attacker use Bitdefender update infrastructure as a request proxy to the relay server. The documented impact is limited data exposure, not system takeover. It still matters because security tooling often has trusted network reach.
Executive priority
Treat this as a medium-priority security platform hygiene issue. Prioritize affected relay-connected environments because security tools often have network trust that can amplify SSRF impact.
Technical view
CVE-2021-3552 is a CWE-918 SSRF in Bitdefender Endpoint Security Tools EPPUpdateService, tied to insufficient regular-expression validation in a configuration file. Affected versions are BEST before 6.6.27.390 and before 7.1.2.33, plus GravityZone 6.24.1-1.
Likely exposure
Exposure is most likely where affected Bitdefender Endpoint Security Tools or GravityZone versions remain deployed, especially around relay servers reachable from broad internal or untrusted network segments.
Exploitation context
The CVE has CVSS 5.3, network attack vector, low complexity, no privileges, and no user interaction. The provided sources do not show active exploitation, and CISA KEV status is false.
Researcher notes
Public source detail is limited. The record identifies SSRF in EPPUpdateService and affected version thresholds, but does not provide safe detection indicators, exploit evidence, or detailed remediation for GravityZone beyond the affected version.
Mitigation direction
- Upgrade Bitdefender Endpoint Security Tools to 6.6.27.390, 7.1.2.33, or later supported releases.
- For GravityZone 6.24.1-1, check Bitdefender advisory and support guidance for the corrected release path.
- Restrict relay server access to expected endpoint and management networks.
- Review update relay exposure and remove unnecessary inbound reachability.
Validation and detection
- Inventory Bitdefender Endpoint Security Tools versions across endpoints and relay-related hosts.
- Confirm no systems run versions earlier than 6.6.27.390 or 7.1.2.33.
- Identify any GravityZone 6.24.1-1 deployments and verify vendor remediation status.
- Review relay server logs for unexpected proxied requests or unusual destinations.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-918: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCloud metadata behavior lookup
The CVE wording references SSRF or metadata access, so cloud discovery and credential material review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-3552 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.bitdefender.com/support/security-advisories/insufficient-validation-regular-expression-eppupdateservice-config-file-va-9825CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.