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
- Sonicwall Sma_200
- Sonicwall Sma_200_firmware — versions 9.0.0.11-31sv, 10.2.0.8-37sv, 10.2.1.1-19sv
- Sonicwall Sma_210
- Sonicwall Sma_210_firmware — versions 9.0.0.11-31sv, 10.2.0.8-37sv, 10.2.1.1-19sv
- Sonicwall Sma_400
- Sonicwall Sma_400_firmware — versions 9.0.0.11-31sv, 10.2.0.8-37sv, 10.2.1.1-19sv
- Sonicwall Sma_410
- Sonicwall Sma_410_firmware — versions 9.0.0.11-31sv, 10.2.0.8-37sv, 10.2.1.1-19sv
- Sonicwall Sma_500v
- Sonicwall Sma_500v_firmware — versions 9.0.0.11-31sv, 10.2.0.8-37sv, 10.2.1.1-19sv
Weakness classification (CWE)
Public proof-of-concept exploits
References
- PSIRT@sonicwall.com (x_refsource_CONFIRM, Vendor Advisory)
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.