Vulnerability report

Active exploitation observed Confirmed confidence In CISA KEV

CVE-2026-83548

SMA1000 Server-Side Request Forgery

SonicWall / SMA1000 · 12.4.3-03453 (platform-hotfix) and older versions

Watch CVE-2026-83548 Browse KEV feed
Severity
CVSS 10.0 · Critical
Confidence
Confirmed
Exploit status
Observed in sensors
EPSS
8.0%
First observed
17 Sep 2026
Last observed
16 Oct 2026

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-83548 is an unauthenticated vulnerability affecting SonicWall SMA1000. A Pre-authentication SSRF vulnerability exists in the SMA1000 Appliance Work Place interface due to an unintended alternate access path....

Is it exploited?

Yes. Previdian sensors observed exploitation attempts with confirmed confidence. Listed in CISA KEV. Also confirmed by third-party sources.

Who is affected?

SonicWall / SMA1000 12.4.3-03453 (platform-hotfix) and older versions.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

Overview

SMA1000 Server-Side Request Forgery

A Pre-authentication SSRF vulnerability exists in the SMA1000 Appliance Work Place interface due to an unintended alternate access path.

A remote unauthenticated attacker could potentially exploit this vulnerability to gain unauthorized access to sensitive functionality and perform unauthorized operations.

SonicWall Affected
SMA1000
12.4.3-03453 (platform-hotfix) and older versions 12.5.0-02835 (platform-hotfix) and older versions
View vendor advisory (opens in new tab)
Published
01 Sep 2026
Exploitation Reported
01 Sep 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

edge cisa nuclei_scanner

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

Sonicwall PSIRT

Recorded 01 Sep 2026

A trusted third party reported exploitation.

Active exploitation observed

Previdian sensor

First observed 17 Sep 2026

Previdian first observed exploitation attempts targeting this vulnerability in our honeypot sensors.

Proof of concept available

Nuclei Templates

Recorded 09 Sep 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access
Source Added
Sonicwall PSIRT First 2026-09-01 20:19 UTC
Rapid7 2026-09-02 16:58 UTC
CISA 2026-09-02 17:31 UTC
CVE 2026-09-02 18:03 UTC
Previdian Sensors 2026-10-01 15:46 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Previdian sensors recorded exploitation attempts targeting this vulnerability. The cards and chart show volume, unique attackers, and daily activity.

668

Attempts observed

9

Unique attacker IPs

2

Attacker countries

SG · US

2

Sensors observed

CVE-2026-83548 exploitation attempts over the last 32 days

Daily events observed by Previdian sensors

Updated 17 Oct 2026

0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
1
1
0
0
0
0
0
0
8
92
0
0
0
43
261
260
0
16 Sep 23 Sep 30 Sep 7 Oct 17 Oct

First observed 17 Sep 2026 · Last observed 16 Oct 2026

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Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
665
4
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Virtual patch status

Previdian virtual patch guidance is available for this CVE.

AWS WAF Cloudflare ModSecurity

Attacker IP Indicators

Attacker IP indicators observed · available in Pro and Enterprise.

Sensor-derived attacker IP indicators are available to Pro and Enterprise accounts under Detection and through the Pro API.

Learn about Pro API access

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Nuclei https://github.com/projectdiscovery/nuclei-templates/blob/main/javascript/cves/2026/CVE-2026-83548.yaml 09 Sep 2026

Virtual Patch Detail

Compensating WAF rules for this CVE.

Available

Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to Previdian Enterprise users.

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Risk and context

Severity, weaknesses, and research context

CVSS v3.1

10.0 Critical

Potential damage if exploited. Separate from whether attackers are using it.

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

EPSS

8.0%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Unintended Proxy or Intermediary ('Confused Deputy') CWE-441 Server-Side Request Forgery (SSRF) CWE-918

Recent mention · The Hacker News

SonicWall Patches CVSS 10.0 Pre-Authentication SSRF Flaw in SMA1000 Appliances

Swati KhandelwalOct 07, 2026Vulnerability / Network Security SonicWall has released hotfixes for four flaws in its SMA1000 appliances, the gateways that give remote workers access to a company's network and applications. The most serious could allow an attacker without a...

Read full advisory

All CVSS Scores

CVSS v3.1 10.0 Critical

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

CVSS v3.0 10.0 Critical

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

All Mentions

Recent mention · The Hacker News

SonicWall Patches CVSS 10.0 Pre-Authentication SSRF Flaw in SMA1000 Appliances

The Hacker News · 07 Oct 2026

Swati KhandelwalOct 07, 2026Vulnerability / Network Security SonicWall has released hotfixes for four flaws in its SMA1000 appliances, the gateways that give remote workers access to a company's network and applications. The most serious could allow an attacker without a login to send requests through the appliance and reach internal functions. SonicWall rates it 10.0 on the CVSS scale and says it has no evidence that any of the four flaws is being used in attacks. The most serious flaw, tracked as CVE-2026-102255, is a server-side request forgery (SSRF) bug in WorkPlace, the portal that...

Recent mention · Rapid7

Metasploit Wrap Up: This One Goes to Sixteen!

Rapid7 · 11 Sep 2026

This One Goes to Sixteen!Another banger from Metasploit with sixteen new modules, including ten exploit modules, with five on the CISA KEV list. Cisco, Papercut, Sonicwall, Jetbrains, and Langflow all have exploit modules, and not to be outdone, we even have a Metasploit scanner to watch the watchers!New module content (16)Elasticsearch ingest-attachment Apache Tika XFA XXE Local File ReadAuthors: Bourbon Offensive Security Services and Jean-Marie BourbonType: AuxiliaryPull request: #21739 contributed by kmkzPath: scanner/http/elasticsearch_tika_xfa_xxeCVE...

Recent mention · The Hacker News

CISA Adds Seven Exploited Flaws as Attackers Deploy Reverse Shells and Crypto Miners

The Hacker News · 03 Sep 2026

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Wednesday added seven security flaws to its Known Exploited Vulnerabilities (KEV) catalog after they landed in attackers' crosshairs. The vulnerabilities are as follows - CVE-2026-83548 (CVSS score: 10.0) - A server-side request forgery vulnerability in SonicWall SMA 1000 Appliances that could allow a remote unauthenticated

Recent mention · Rapid7

Critical SonicWall SMA1000 Vulnerabilities CVE-2026-83548, CVE-2026-83549 Exploited in the Wild

Rapid7 · 02 Sep 2026

OverviewOn September 1, 2026, SonicWall disclosed two vulnerabilities affecting SonicWall SMA1000 appliances that the vendor says are being actively exploited in the wild. The vulnerabilities, CVE-2026-83548 and CVE-2026-83549, can be chained to achieve unauthenticated remote code execution (RCE) on affected appliances.CVE-2026-83548 is a critical pre-authentication server-side request forgery (SSRF) vulnerability in the SMA1000 Appliance Work Place interface. The flaw has a CVSS v3.1 base score of 10.0 and can allow a remote, unauthenticated attacker to access sensitive functionality and...

Recent mention · TheRegister

SonicWall's SMA1000 boxes under active attack again

TheRegister · 02 Sep 2026

Miscreants use chained zero days to pwn boxen as third-party SOCs say further attacks 'almost certain'

Recent mention · The Hacker News

Attackers Exploit Two SonicWall SMA 1000 Zero-Days That May Form an Attack Chain

The Hacker News · 02 Sep 2026

SonicWall has released security updates to address two security flaws impacting its Secure Mobile Access (SMA) 1000 series VPN appliances that have been exploited in zero-day attacks. The vulnerabilities, discovered internally by SonicWall's William Perry and Adam Babis, are listed below - CVE-2026-83548 (CVSS score: 10.0) -  A pre-authentication SSRF vulnerability in the Appliance

Recent mention · Sonicwall PSIRT

SonicWall SMA1000 Series Appliances Affected By Multiple Vulnerabilities

Sonicwall PSIRT · 01 Sep 2026

1) CVE-2026-83548 - Pre-authentication SSRF via unintended forward-proxy A Pre-authentication SSRF vulnerability exists in the SMA1000 Appliance Work Place interface due to an unintended alternate access path. A remote unauthenticated attacker could potentially exploit this vulnerability to gain unauthorized access to sensitive functionality and perform unauthorized operations.. CVSS Score: 10.0 CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H CWE-918: Server-Side Request Forgery (SSRF) CWE-441: Unintended Proxy or Intermediary ('Confused Deputy') 2) CVE-2026-83549 -...

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

SonicWall SMA1000 WorkPlace - Unauthenticated SSRF to CouchDB

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation

  1. 11:40 UTC

    Virtual patch available

    Compensating WAF rule available to block exploitation

  2. 13:45 UTC

    Indicators of compromise added (9)

    Indicators of compromise recorded

  3. 13:45 UTC

    Observed by Previdian sensors

    Evidence-backed exploitation signal

  4. 04:31 UTC

    Public PoC available

    Public proof-of-concept code published

  5. 04:31 UTC

    Nuclei template available

    Scanner coverage available

  6. 18:03 UTC

    KEV confirmed by CVE

    Exploitation attested by an external source

  7. 17:31 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  8. 16:58 UTC

    KEV confirmed by Rapid7

    Exploitation attested by an external source

  9. 21:25 UTC

    CVE published

    Vulnerability disclosed publicly

  10. 20:33 UTC

    Added to the Previdian watchlist

    Pro and Enterprise Watch users had 1 day of early warning before CISA KEV.

  11. 20:19 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  12. 18:15 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

Start 14-day Pro trial Read API docs
  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-83548

Sample API response 
{
  "cve_id": "CVE-2026-83548",
  "confidence": "Confirmed",
  "cvss_score": 10.0,
  "cvss_estimated": false,
  "epss_score": 0.08043,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 668, "sensors": 2 }
}