UpHeron
All vulnerabilities

Servers and applications

CVE-2021-20048

A Stack-based buffer overflow in the SonicOS SessionID HTTP response header allows a remote authenticated attacker to cause Denial of Service (DoS) and potentially results in code execution in the firewall. This vulnerability affected SonicOS Gen 5, Gen 6 and Gen 7 firmware versions.

Severity
High 8.8
Published
10 Jan 2022
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
  • Every version up to 6.0.5.3-94o
  • Every version up to 6.5.1.13-1n
  • Every version up to 6.5.4.8
All 7 release lines
  • Every version up to 7.0.1-r1456
  • Every version up to 7.0.1-5023-1349
  • Every version up to 7.0.1-5018-r1715
  • Every version up to 6.5.4.8
  • Every version up to 6.5.1.13-1n
  • Every version up to 6.0.5.3-94o
  • Every version up to 5.9.1.13

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-20048
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-20048