What’s Vulnerable › Vulnerabilities

CVE-2021-20048

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-01-10 · updated 2026-06-17
• Weakness: CWE-121

Description

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.

Affected products

• SonicWall SonicOS: through 7.0.1-r1456; through 7.0.1-5023-1349; through 7.0.1-5018-r1715; through 6.5.4.8; through 6.5.1.13-1n; through 6.0.5.3-94o

References

• https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0028
• https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0028

Get alerted when CVE-2021-20048 or the next vulnerability affects your stack