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High severity8.8NVD Advisory· Published Jan 10, 2022· Updated Jun 17, 2026

CVE-2021-20046

CVE-2021-20046

Description

A Stack-based buffer overflow in the SonicOS HTTP Content-Length 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.

Affected products

3
  • SonicWall/Sonicos3 versions
    cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:*range: <=7.0.1-r146
    • (no CPE)
    • (no CPE)range: 7.0.1-R146 and earlier

Patches

Vulnerability mechanics

References

1

News mentions

0

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