ACTIVELY EXPLOITED
CVE-2020-5135: SonicWall SonicOS Buffer Overflow Vulnerability
| Vendor | SonicWall |
|---|---|
| Product | SonicOS |
| Actively exploited | Yes |
| Added to CISA KEV | 15 Mar 2022 |
| CISA federal deadline | 5 Apr 2022 |
| Ransomware use | Known |
| Weakness (CWE) | CWE-120 |
Required action (CISA's text)
Apply updates per vendor instructions.
Description (NVD)
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.
SOURCES
Other SonicWall flaws
- CVE-2026-19868: SonicWall SonicOS SSLVPN Use of Single-factor Authentication Vulnerability
- CVE-2026-83549: SonicWall SMA1000 Appliances OS Command Injection Vulnerability
- CVE-2026-83548: SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability
- CVE-2026-15410: SonicWall SMA1000 Appliances Code Injection Vulnerability
- CVE-2026-15409: SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.