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CVE-2021-20042

CRITICALCVSS 9.8/10EPSS 2.66%

Last modified

CVE-2021-20042 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An unauthenticated remote attacker can use SMA 100 as an unintended proxy or intermediary undetectable proxy to bypass firewall rules. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances.. EPSS estimates a 2.66% chance of exploitation in the next 30 days.

Description

An unauthenticated remote attacker can use SMA 100 as an unintended proxy or intermediary undetectable proxy to bypass firewall rules. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances.

Metrics

CVSS 3.1
9.8/10

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

EPSS Probability
2.66%

83.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
SonicwallSma 200 Firmware9.0.0.11-31sv
SonicwallSma 200 Firmware10.2.0.8-37sv
SonicwallSma 200 Firmware10.2.1.1-19sv
SonicwallSma 210 Firmware9.0.0.11-31sv
SonicwallSma 210 Firmware10.2.0.8-37sv
SonicwallSma 210 Firmware10.2.1.1-19sv
SonicwallSma 410 Firmware9.0.0.11-31sv
SonicwallSma 410 Firmware10.2.0.8-37sv
SonicwallSma 410 Firmware10.2.1.1-19sv
SonicwallSma 400 Firmware9.0.0.11-31sv
SonicwallSma 400 Firmware10.2.0.8-37sv
SonicwallSma 400 Firmware10.2.1.1-19sv
SonicwallSma 500v Firmware9.0.0.11-31sv
SonicwallSma 500v Firmware10.2.0.8-37sv
SonicwallSma 500v Firmware10.2.1.1-19sv

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-20042?
An unauthenticated remote attacker can use SMA 100 as an unintended proxy or intermediary undetectable proxy to bypass firewall rules. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances.
How severe is CVE-2021-20042?
CVE-2021-20042 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.66% probability of exploitation in the next 30 days.
How do I fix CVE-2021-20042?
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-2021-20042?

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

Scan your code now

Source: NVD / NIST