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8.8

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...

CVE-2021-20046 · published 4 years ago
Summary

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.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
sonicwall sonicos <= 7.0.1-r146
<= 7.0.1-5023-1349
<= 7.0.1-5018-r1715
<= 6.5.4.8-89n
<= 6.5.1.13-1n
<= 6.0.5.3-94o
>= 5.0.0.0, <= 5.9.1.13
cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:*
Original advisory text
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...
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.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker full control (estimated)
Severity
8.8 High
Exploitation
2% chance of attack within 30 days
Type
CWE-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
Timeline
Published10 Jan 2022
Updated31 Oct 2026
First seen29 Sep 2026
Sources
CVE-2021-20046 · NVD
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