Original release date: April 21, 2021
CISA is aware of three vulnerabilities affecting SonicWall Email Security products: CVE-2021-20021, CVE-2021-20022, and CVE-2021-20023. A remote attacker could exploit these vulnerabilities to take control of an affected system. According to SonicWall, “In at least one known case, these vulnerabilities have been observed to be exploited ‘in the wild.’”
CISA encourages users and administrators to review the SonicWall security advisory and apply the necessary update as soon as possible. Note: SonicWall released patches for CVE-2021-20021 and CVE-2021-20022 on April 9, 2021, and for CVE-2021-20023 on April 20, 2021.
This product is provided subject to this Notification and this Privacy & Use policy.
Update (07/24/2025): CISA continues to update reporting on this ongoing activity, as threat actor tactics,…
CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence…
CISA released nine Industrial Control Systems (ICS) advisories on July 22, 2025. These advisories provide…
CISA released six Industrial Control Systems (ICS) advisories on July 24, 2025. These advisories provide…
CISA has added four new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence…
CISA, in partnership with the Federal Bureau of Investigation (FBI), the Department of Health and…
This website uses cookies.