UpHeron
All vulnerabilities

Servers and applications

CVE-2020-5135

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. This vulnerability affected SonicOS Gen 6 version 6.5.4.7, 6.5.1.12, 6.0.5.3, SonicOSv 6.5.4.v and Gen 7 version 7.0.0.0.

Actively exploited: CISA added it to its Known Exploited Vulnerabilities catalog on 15 Mar 2022.

Severity
Critical 9.8
Published
12 Oct 2020
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
SonicWall SonicOSServers and applications · cpe:o:sonicwall:sonicos
  • Every version up to 6.0.5.3
  • From 6.5.0.0 up to 6.5.1.11
  • From 6.5.4.0 up to 6.5.4.7
  • Version 7.0.0.0

Known exploited

CISA name
SonicWall SonicOS Buffer Overflow Vulnerability
Required action
Apply updates per vendor instructions.
Due for US agencies
5 Apr 2022
Used in ransomware
Yes, known

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2020-5135
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2020-5135