high
8.8
CWE
787 121 119
Advisory Published
Updated

CVE-2021-20046: Buffer Overflow

First published: Fri Jan 07 2022(Updated: )

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.

Credit: PSIRT@sonicwall.com

Affected SoftwareAffected VersionHow to fix
SonicWall SonicOS<=7.0.1-r146
Sonicwall Nsa 2650
Sonicwall Nsa 2700
Sonicwall Nsa 3650
Sonicwall Nsa 3700
Sonicwall Nsa 4650
Sonicwall Nsa 4700
Sonicwall Nsa 5650
Sonicwall Nsa 6650
Sonicwall Nsa 6700
Sonicwall Nsa 9250
Sonicwall Nsa 9450
Sonicwall Nsa 9650
Sonicwall Tz270
Sonicwall Tz270w
Sonicwall Tz300
Sonicwall Tz300p
Sonicwall Tz300w
Sonicwall Tz350
Sonicwall Tz350w
Sonicwall Tz370
Sonicwall Tz370w
Sonicwall Tz400
Sonicwall Tz400w
Sonicwall Tz470
Sonicwall Tz470w
Sonicwall Tz500
Sonicwall Tz500w
Sonicwall Tz570
Sonicwall Tz570p
Sonicwall Tz570w
Sonicwall Tz600
Sonicwall Tz600p
Sonicwall Tz670
SonicWall SonicOS<=7.0.1-5023-1349
Sonicwall Nsv 10
Sonicwall Nsv 100
Sonicwall Nsv 1600
Sonicwall Nsv 200
Sonicwall Nsv 25
Sonicwall Nsv 270
Sonicwall Nsv 300
Sonicwall Nsv 400
Sonicwall Nsv 470
Sonicwall Nsv 50
Sonicwall Nsv 800
Sonicwall Nsv 870
SonicWall SonicOS<=7.0.1-5018-r1715
Sonicwall Nssp 12400
Sonicwall Nssp 12800
Sonicwall Nssp 13700
Sonicwall Nssp 15700
SonicWall SonicOS<=6.5.4.8-89n
Sonicwall Soho 250w
Sonicwall Supermassive 9200
Sonicwall Supermassive 9400
Sonicwall Supermassive 9600
Sonicwall Supermassive 9800
SonicWall SonicOS<=6.5.1.13-1n
SonicWall SonicOS<=6.0.5.3-94o
Sonicwall Supermassive E10200
Sonicwall Supermassive E10400
Sonicwall Supermassive E10800
SonicWall SonicOS>=5.0.0.0<=5.9.1.13
Sonicwall Soho 250

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Reference Links

Frequently Asked Questions

  • What is CVE-2021-20046?

    CVE-2021-20046 is a stack-based buffer overflow vulnerability in the SonicOS HTTP Content-Length response header.

  • How does CVE-2021-20046 affect SonicOS firmware versions?

    CVE-2021-20046 affects SonicOS Gen 5, Gen 6, and Gen 7 firmware versions.

  • What is the severity of CVE-2021-20046?

    CVE-2021-20046 has a severity rating of 8.8 (high).

  • How can CVE-2021-20046 be exploited?

    CVE-2021-20046 can be exploited by a remote authenticated attacker to cause denial of service (DoS) and potentially execute code in the firewall.

  • Where can I find more information about CVE-2021-20046?

    You can find more information about CVE-2021-20046 at the following link: [SonicWall PSIRT](https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0027)

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