CVE-2021-20046

8.8 highEPSS 2.0%

High (8.8) in sonicwall sonicos. EPSS 2.0% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

8.8 high

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 2.0% chance of exploitation in the next 30 days; higher than 80% of CVEs (scores of 2026-10-31)
CWEs: CWE-787, CWE-121
Published: 2022-01-10
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

sonicwall:sonicos

References

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0027
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0027

Check your stack JSON