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ExploitedIn CISA KEVFix available

CVE-2021-20016

Exploitation confirmed. First attested on 2021-11-03 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2021-02-04
  • Fixed in10.2.0.5-d-29sv
  • WeaknessCWE-89

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2021-02-0406:15CVE publishedNVD
  2. 2021-11-03Added to the CISA KEV catalogCISA KEV
  3. 2021-11-03Listed as exploited by GCVEGCVE
  4. 2021-11-03Exploitation first reportedCISA KEV
  5. 2025-02-0619:54SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-04 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-20016?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-20016?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Sonicwall sma 100 firmwareversion to verify
BranchAffectedFixed in
10.x≥ 10.0.0.0, < 10.2.0.5-d-29sv10.2.0.5-d-29sv
Sonicwall sma 200 firmwareversion to verify
BranchAffectedFixed in
—all versionsno fix published
Sonicwall sma 210 firmwareversion to verify
BranchAffectedFixed in
—all versionsno fix published

3 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As sonicwall, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • SonicWall SMA100
    Affected
    • = SMA100 build version 10.xno fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2021-02-03

Fix

  1. Update Sonicwall sma 100 firmware to 10.2.0.5-d-29sv
  2. CISA’s required action: Apply updates per vendor instructions.due 2021-11-17

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2021-11-03
Patch Due Date
2021-11-17
Ransomware Use
Known
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2021-02-04
Last Modified
2026-08-12
NVD status
Analyzed
GitHub Advisory
GHSA-c283-6775-92m9

Frequently asked questions

What is CVE-2021-20016?

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.

Is CVE-2021-20016 actively exploited?

Yes. CVE-2021-20016 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2021-11-17.

What is the CVSS score for CVE-2021-20016?

CVE-2021-20016 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record