March 15, 2022 · Applied Cybernetics Group
CVE-2020-5135 — SonicWall SonicOS
known ransomware use
SonicWall SonicOS Buffer Overflow Vulnerability
- Added to KEV
2022-03-15- Federal due date
2022-04-05- Vendor
- SonicWall
- Product
- SonicOS
- EPSS
- 98.0th percentile (score 0.269, as of
2026-10-04) - NVD CVSS v3.1
- —
- Ransomware use
- Known
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2020-5135
CISA short description
A buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary code by sending a malicious request to the firewall.
Required action
Apply updates per vendor instructions.