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Known exploited · SonicWall

CVE-2026-83548: SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability

What it is

SonicWall SMA1000 Appliances contains a server-side request forgery vulnerability that could allow a remote unauthenticated attacker to gain unauthorized access to sensitive functionality and perform unauthorized operations.

Added September 2, 2026Due September 5, 2026CISA KEV catalog 2026.10.01

Vendor
SonicWall
Product
SMA1000 Appliances
Added to KEV
September 2, 2026
CISA due date
September 5, 2026
Ransomware use
Unknown

What CISA requires

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Forensic triage

Yes

What to do now

  1. Find every instance of SMA1000 Appliances you run, including the forgotten ones, and check its version against the vendor advisory.
  2. Apply the vendor's fix or mitigation, before September 5, 2026 if you are bound by CISA's deadline, sooner if it faces the internet.
  3. Assume it was tried against you already: look for signs of exploitation from the date it was added, not from the day you patched.
  4. Until every instance is patched, block the attack at the edge: a WAF in blocking mode stops SSRF payloads aimed at cloud metadata endpoints.

References

CVE-2026-83548 in the National Vulnerability Database

The Dome

Block it at the edge while you patch

The Dome's WAF runs the OWASP Core Rule Set in blocking mode and stops SSRF payloads aimed at cloud metadata endpoints before they reach your application.

See the Dome

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Source: CISA Known Exploited Vulnerabilities Catalog (public domain), catalog version 2026.10.01.