Cyber Resilience

CVE-2021-20042

Critical

Published: 08 December 2021

Published
08 December 2021
Modified
21 November 2024
KEV Added
—
Patch
—
CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0056 68.7th percentile
Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-20042 is a critical-severity Confused Deputy (CWE-441) vulnerability in Sonicwall Sma 200 Firmware. Its CVSS base score is 9.8 (Critical).

Operationally, ranked in the top 31.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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(s)
CWE-441NVD-CWE-Other

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

sonicwall
sma 200 firmware
10.2.0.8-37sv, 10.2.1.1-19sv, 9.0.0.11-31sv
sonicwall
sma 210 firmware
10.2.0.8-37sv, 10.2.1.1-19sv, 9.0.0.11-31sv
sonicwall
sma 410 firmware
10.2.0.8-37sv, 10.2.1.1-19sv, 9.0.0.11-31sv
sonicwall
sma 400 firmware
10.2.0.8-37sv, 10.2.1.1-19sv, 9.0.0.11-31sv
sonicwall
sma 500v firmware
10.2.0.8-37sv, 10.2.1.1-19sv, 9.0.0.11-31sv

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-32 System Partitioning
addresses: CWE-441

Mitigates confused deputy risks by ensuring distinct privilege domains so one partition cannot unintentionally act on behalf of another.

References