CVE-2021-3554
CVE-2021-3554 is a critical-severity vulnerability in Bitdefender Endpoint Security Tools with a CVSS 3.x base score of 9.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-284.
Key facts
- Severity: Critical (CVSS 3.x base score 9.0)
- CVSS v2: 7.5
- EPSS exploit prediction: 3% (84th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-284
- Affected product: Bitdefender Endpoint Security Tools
- Published:
- Last modified:
Description
Improper Access Control vulnerability in the patchesUpdate API as implemented in Bitdefender Endpoint Security Tools for Linux as a relay role allows an attacker to manipulate the remote address used for pulling patches. This issue affects: Bitdefender Endpoint Security Tools for Linux versions prior to 6.6.27.390; versions prior to 7.1.2.33. Bitdefender Unified Endpoint versions prior to 6.2.21.160. Bitdefender GravityZone versions prior to 6.24.1-1.
Frequently asked questions
- What is CVE-2021-3554?
- Improper Access Control vulnerability in the patchesUpdate API as implemented in Bitdefender Endpoint Security Tools for Linux as a relay role allows an attacker to manipulate the remote address used for pulling patches. This issue affects: Bitdefender Endpoint Security Tools for Linux versions prior to 6.6.27.390; versions prior to 7.1.2.33. Bitdefender Unified Endpoint versions prior to 6.2.21.160. Bitdefender GravityZone versions prior to 6.24.1-1.
- How severe is CVE-2021-3554?
- CVE-2021-3554 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-3554 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-3554?
- CVE-2021-3554 primarily affects Bitdefender Endpoint Security Tools. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2021-3554?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2021-3554 published?
- CVE-2021-3554 was published on 2021-11-24 and last updated on 2026-06-17.
References
Affected products (4)
- cpe:2.3:a:bitdefender:endpoint_security_tools:*:*:*:*:*:*:*:*
- cpe:2.3:a:bitdefender:endpoint_security_tools:*:*:*:*:*:linux:*:*
- cpe:2.3:a:bitdefender:gravityzone:*:*:*:*:*:*:*:*
- cpe:2.3:a:bitdefender:gravityzone:6.24.1-1:*:*:*:*:*:*:*
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