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Servers and applications

CVE-2020-5136

A buffer overflow vulnerability in SonicOS allows an authenticated attacker to cause Denial of Service (DoS) in the SSL-VPN and virtual assist portal, which leads to a firewall crash. This vulnerability affected SonicOS Gen 5 version 5.9.1.7, 5.9.1.13, 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.

Severity
Medium 6.5
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 5.9.1.13
  • From 6.0.0.0 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

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2020-5136
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2020-5136