CVE-2021-20016

9.8 CRITICAL 40% exploit odds Drop everything exploited in the wild Fix listed Injection Device

What it is

A SQL-Injection vulnerability in the SonicWall SSLVPN SMA100 product allows a remote unauthenticated attacker to perform SQL query to access username password and other session related information. This vulnerability impacts SMA100 build version 10.x.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.
In the wild: CISA lists this as exploited in real attacks. Treat as urgent.
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2020-12-17 00:00 UTC ReservedThe CVE id was reserved by its CNA
2021-02-04 06:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2021-11-03 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
2021-11-17 Remediation deadlineCISA's due date for federal agencies to fix it
2026-08-12 05:17 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
Exploit odds: 40.0% in the next 30 days (EPSS).
Severity: 9.8 CRITICAL (CVSS).
Fix: a patch or advisory is linked.
It meets the bar for Drop everything: critical, and exploited or very likely to be.

Details

Published: 2021-02-04 06:15 UTC
Last modified: 2026-08-12 05:17 UTC
Added to CISA KEV: 2021-11-03
Exploit probability: 40.0% · EPSS, next 30 days
Weakness: CWE-89 · SQL injection
Record status: Analyzed

Affected

Sonicwall Sma 100 Firmware < 10.2.0.5-d-29sv
Sonicwall Sma 200 Firmware
Sonicwall Sma 210 Firmware
Sonicwall Sma 400 Firmware
Sonicwall Sma 410 Firmware
Sonicwall Sma 500v

Attack profile CVSS 3.1 · 9.8

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Is it in your code?

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Read https://cve-list.com/agent/cve/CVE-2021-20016.md and follow it. Check whether this project is affected by CVE-2021-20016. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record