How severe is CVE-2021-20025?

CVE-2021-20025 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-2021-20025 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20025?

CVE-2021-20025 affects Sonicwall Email Security Virtual Appliance. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20025?

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-2021-20025 published?

CVE-2021-20025 was published on 2021-05-13 and last updated on 2026-06-17.

CVE-2021-20025

CVE-2021-20025 is a high-severity vulnerability in Sonicwall Email Security Virtual Appliance 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-798.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.9
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-798
Affected product: Sonicwall Email Security Virtual Appliance
Published: 2021-05-13
Last modified: 2026-06-17

Description

SonicWall Email Security Virtual Appliance version 10.0.9 and earlier versions contain a default username and a password that is used at initial setup. An attacker could exploit this transitional/temporary user account from the trusted domain to access the Virtual Appliance remotely only when the device is freshly installed and not connected to Mysonicwall.

Frequently asked questions

What is CVE-2021-20025?: SonicWall Email Security Virtual Appliance version 10.0.9 and earlier versions contain a default username and a password that is used at initial setup. An attacker could exploit this transitional/temporary user account from the trusted domain to access the Virtual Appliance remotely only when the device is freshly installed and not connected to Mysonicwall.
How severe is CVE-2021-20025?: CVE-2021-20025 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-2021-20025 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20025?: CVE-2021-20025 affects Sonicwall Email Security Virtual Appliance. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20025?: 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-2021-20025 published?: CVE-2021-20025 was published on 2021-05-13 and last updated on 2026-06-17.

References

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0012

Affected products (1)

cpe:2.3:a:sonicwall:email_security_virtual_appliance:*:*:*:*:*:*:*:*

More vulnerabilities in Sonicwall Email Security Virtual Appliance

CVE-2021-20021 — Critical (CVSS 9.8): A vulnerability in the SonicWall Email Security version 10.0.9.x allows an attacker to create an administrative account…
CVE-2021-20022 — High (CVSS 7.2): SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to upload…
CVE-2021-20023 — Medium (CVSS 4.9): SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to read an…

All CVEs affecting Sonicwall Email Security Virtual Appliance →

Other CWE-798 (Use of Hard-coded Credentials) vulnerabilities

CVE-2026-13768 — Critical (CVSS 10.0): Gardyn devices expose a privileged iothubowner key. Access to this key will allow a malicious user to invoke an IoTHub…
CVE-2026-45631 — Critical (CVSS 10.0): Dokploy is a free, self-hostable Platform as a Service (PaaS). From 0.27.0 to before 0.29.3, a hardcoded…
CVE-2026-22769 — Critical (CVSS 10.0): Dell RecoverPoint for Virtual Machines, versions prior to 6.0.3.1 HF1, contain a hardcoded credential vulnerability.…
CVE-2025-42890 — Critical (CVSS 10.0): SQL Anywhere Monitor (Non-GUI) baked credentials into the code,exposing the resources or functionality to unintended…
CVE-2025-7503 — Critical (CVSS 10.0): An OEM IP camera manufactured by Shenzhen Liandian Communication Technology LTD exposes a Telnet service (port 23) with…
CVE-2025-20309 — Critical (CVSS 10.0): A vulnerability in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session…

Browse all CWE-798 (Use of Hard-coded Credentials) vulnerabilities →