How severe is CVE-2021-20037?

CVE-2021-20037 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-2021-20037 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20037?

CVE-2021-20037 affects Sonicwall Global Vpn Client. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20037?

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-2021-20037 published?

CVE-2021-20037 was published on 2021-09-21 and last updated on 2026-06-17.

CVE-2021-20037

CVE-2021-20037 is a high-severity vulnerability in Sonicwall Global Vpn 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% (32nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-276
Affected product: Sonicwall Global Vpn Client
Published: 2021-09-21
Last modified: 2026-06-17

Description

SonicWall Global VPN Client 4.10.5 installer (32-bit and 64-bit) incorrect default file permission vulnerability leads to privilege escalation which potentially allows command execution in the host operating system. This vulnerability impacts GVC 4.10.5 installer and earlier.

Frequently asked questions

What is CVE-2021-20037?: SonicWall Global VPN Client 4.10.5 installer (32-bit and 64-bit) incorrect default file permission vulnerability leads to privilege escalation which potentially allows command execution in the host operating system. This vulnerability impacts GVC 4.10.5 installer and earlier.
How severe is CVE-2021-20037?: CVE-2021-20037 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-2021-20037 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20037?: CVE-2021-20037 affects Sonicwall Global Vpn Client. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20037?: 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-2021-20037 published?: CVE-2021-20037 was published on 2021-09-21 and last updated on 2026-06-17.

References

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0024

Affected products (1)

cpe:2.3:a:sonicwall:global_vpn_client:*:*:*:*:*:*:*:*

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