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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.037 (89.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 89.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.026 · newest: 0.037 · change: +0.011
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.global.sonicwall.com/vuln-detail/SNWLID-2021-0026 (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.