Security readout for executives and security teams
Plain-English summary
This flaw lets a local, low-privileged attacker potentially make Bitdefender GravityZone Business Security load an attacker-controlled DLL and gain higher privileges. It affects versions before 6.6.23.329. The business concern is endpoint security software becoming a privilege-escalation path after an attacker already has local access.
Executive priority
High priority for environments using affected Bitdefender GravityZone Business Security versions. It is not described as remotely exploitable, but security agents often run with elevated privileges, so affected endpoints can amplify the impact of an initial compromise.
Technical view
CVE-2021-3423 is a CWE-427 uncontrolled search path issue in the OpenSSL component as used by Bitdefender GravityZone Business Security. The CVSS 3.1 score is 7.8 with local access, high complexity, low privileges, no user interaction, changed scope, and high confidentiality, integrity, and availability impact.
Likely exposure
Organizations running Bitdefender GravityZone Business Security versions earlier than 6.6.23.329 are the stated exposed population. The sources do not identify affected operating systems, deployment roles, or specific component paths.
Exploitation context
The source bundle does not support active exploitation, and KEV status is false. Exploitation requires local access and low privileges, with high attack complexity. Treat this mainly as a post-compromise privilege escalation risk on endpoints running affected versions.
Researcher notes
Evidence is limited to the CVE record and Bitdefender advisory reference. The vulnerability class indicates DLL search path risk, but the bundle does not provide technical root cause details, proof-of-concept status, affected file paths, or broader product impact.
Mitigation direction
- Upgrade Bitdefender GravityZone Business Security to 6.6.23.329 or later.
- Check Bitdefender’s advisory for any deployment-specific remediation guidance.
- Prioritize remediation on shared workstations, servers, and high-value administrative endpoints.
- Restrict unnecessary local user access while remediation is pending.
- Monitor endpoint telemetry for unexpected third-party DLL loads by security components.
Validation and detection
- Inventory installed GravityZone Business Security versions across managed endpoints.
- Confirm all instances are at 6.6.23.329 or later.
- Review endpoint management reports for outdated or unmanaged Bitdefender agents.
- Check security telemetry for suspicious DLL-loading behavior involving Bitdefender processes.
- Document any unsupported or unpatched hosts as accepted risk or remediation exceptions.
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-427: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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 lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-3423 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
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:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H1.16Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.bitdefender.com/support/security-advisories/privilege-escalation-in-bitdefender-gravityzone-business-security-va-9557CVE 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.
Uncontrolled Search Path Element
Uncontrolled Search Path Element represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.