CVE-2021-20042: sonicwall sma_200_firmware Confused Deputy

Vulnerability summary

CVE-2021-20042 is a critical (CVSS 9.8) Confused Deputy vulnerability in sonicwall sma_200_firmware. EPSS estimates a 3.68% chance of exploitation in the next 30 days, higher than 89.5% of scored vulnerabilities.

Timeline

1. 08-12-2021
   PublishedVulnerability first disclosed.
2. 03-08-2024
   Last modifiedVulnerability information updated.

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.

• CWE-441Unintended Proxy or Intermediary ('Confused Deputy')The product receives a request, message, or directive from an upstream component, but the product does not sufficiently preserve the original source of the request before forwarding the request to an external actor that is outside of the product's control sphere. This causes the product to appear to be the source of the request, leading it to act as a proxy or other intermediary between the upstream component and the external actor.