How severe is CVE-2021-3823?

CVE-2021-3823 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-3823 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3823?

CVE-2021-3823 affects Bitdefender Gravityzone. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3823?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-3823 published?

CVE-2021-3823 was published on 2021-10-28 and last updated on 2026-06-17.

CVE-2021-3823

CVE-2021-3823 is a high-severity vulnerability in Bitdefender Gravityzone with a CVSS 3.x base score of 7.1. 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-22.

Key facts

Severity: High (CVSS 3.x base score 7.1)
CVSS v2: 7.5
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Bitdefender Gravityzone
Published: 2021-10-28
Last modified: 2026-06-17

Description

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in the UpdateServer component of Bitdefender GravityZone allows an attacker to execute arbitrary code on vulnerable instances. This issue affects: Bitdefender GravityZone versions prior to 3.3.8.249.

Frequently asked questions

What is CVE-2021-3823?: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in the UpdateServer component of Bitdefender GravityZone allows an attacker to execute arbitrary code on vulnerable instances. This issue affects: Bitdefender GravityZone versions prior to 3.3.8.249.
How severe is CVE-2021-3823?: CVE-2021-3823 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-3823 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3823?: CVE-2021-3823 affects Bitdefender Gravityzone. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3823?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-3823 published?: CVE-2021-3823 was published on 2021-10-28 and last updated on 2026-06-17.

References

https://www.bitdefender.com/support/security-advisories/path-traversal-vulnerability-in-bitdefender-gravitzone-update-server-in-relay-mode-va-10039/

Affected products (1)

cpe:2.3:a:bitdefender:gravityzone:*:*:*:*:*:*:*:*

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