Vulnerability in Sonicwall Sma_200

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.

EPSS: 0.027 (84.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2021-20042?
CVE-2021-20042 is a critical-severity vulnerability in Sonicwall Sma_200, classified under Unintended Proxy or Intermediary (Confused Deputy). CVSS score: 9.8/10. Published 2021-12-08.
How severe is CVE-2021-20042?
Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-20042 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.