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High severity7.5NVD Advisory· Published Jun 14, 2021· Updated Jun 17, 2026

CVE-2021-20027

CVE-2021-20027

Description

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.

Affected products

3
  • SonicWall/Sonicos3 versions
    cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:*range: <=7.0.1-r1262
    • (no CPE)
    • (no CPE)range: SonicOS 5.9.1.13 and earlier

Patches

Vulnerability mechanics

References

1

News mentions

0

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