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CVE-2021-20046

HIGHCVSS 8.8/10EPSS 1.94%

Last modified

CVE-2021-20046 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 1.94% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
8.8/10

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

EPSS Probability
1.94%

77.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
SonicwallSonicos<= 7.0.1-r146
SonicwallSonicos<= 7.0.1-5023-1349
SonicwallSonicos<= 7.0.1-5018-r1715
SonicwallSonicos<= 6.5.4.8-89n
SonicwallSonicos<= 6.5.1.13-1n
SonicwallSonicos<= 6.0.5.3-94o
SonicwallSonicos>= 5.0.0.0, <= 5.9.1.13

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-20046?
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.
How severe is CVE-2021-20046?
CVE-2021-20046 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.94% probability of exploitation in the next 30 days.
How do I fix CVE-2021-20046?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20046?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST