UpHeron
All vulnerabilities

Servers and applications

CVE-2021-20027

A buffer overflow vulnerability in SonicOS allows a remote attacker to cause a Denial of Service (DoS) by sending a specially crafted request. This vulnerability affects SonicOS Gen5, Gen6, Gen7 platforms, and SonicOSv virtual firewalls.

Severity
High 7.5
Published
14 Jun 2021
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 6.0.5.3-94o
  • Every version
  • Every version up to 6.5.4.7
  • Every version up to 6.5.1.12
All 8 release lines
  • Every version up to 7.0.1-r1262
  • Every version up to 7.0.1-r.1219
  • Every version up to 7.0.1-r514
  • Every version up to 5.9.1.13
  • Every version up to 6.5.1.12
  • Every version up to 6.5.4.7
  • Every version
  • Every version up to 6.0.5.3-94o

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-20027
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-20027