How severe is CVE-2021-42711?

CVE-2021-42711 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-42711 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42711?

CVE-2021-42711 affects Barracuda Network Access Client. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-42711?

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-2021-42711 published?

CVE-2021-42711 was published on 2021-12-01 and last updated on 2026-06-17.

CVE-2021-42711

CVE-2021-42711 is a high-severity vulnerability in Barracuda Network Access Client with a CVSS 3.x base score of 7.8. 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-276.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 7.2
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-276
Affected product: Barracuda Network Access Client
Published: 2021-12-01
Last modified: 2026-06-17

Description

Barracuda Network Access Client before 5.2.2 creates a Temporary File in a Directory with Insecure Permissions. This file is executed with SYSTEM privileges when an unprivileged user performs a repair operation.

Frequently asked questions

What is CVE-2021-42711?: Barracuda Network Access Client before 5.2.2 creates a Temporary File in a Directory with Insecure Permissions. This file is executed with SYSTEM privileges when an unprivileged user performs a repair operation.
How severe is CVE-2021-42711?: CVE-2021-42711 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-42711 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42711?: CVE-2021-42711 affects Barracuda Network Access Client. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42711?: 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-2021-42711 published?: CVE-2021-42711 was published on 2021-12-01 and last updated on 2026-06-17.

References

https://github.com/mandiant/Vulnerability-Disclosures/blob/master/MNDT-2021-0010/MNDT-2021-0010.md

Affected products (1)

cpe:2.3:a:barracuda:network_access_client:*:*:*:*:*:windows:*:*

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