CVE-2021-20048

moderate-risk
Published 2022-01-10

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.

Do I need to act?

~
1.4% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.8/10 High
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Sonicwall

References (2)

Vendor Advisory https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0028
Vendor Advisory https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0028
39
/ 100
moderate-risk
Severity 30/34 · Critical
Exploitability 4/34 · Minimal
Exposure 5/34 · Minimal