What’s Vulnerable › Vulnerabilities

CVE-2021-20027

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-06-14 · updated 2026-06-17
• Weakness: CWE-120

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

• SonicWall SonicOS: through 7.0.1-r1262; through 7.0.1-r.1219; through 7.0.1-r514; through 5.9.1.13; through 6.5.1.12; through 6.5.4.7

References

• https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0016
• https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0016

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