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VulnerabilityPublished Updated

CVE-2025-40599: SonicWall SMA 100 Series · Unrestricted File Upload

Affects SonicWall SMA 100 SeriesSource CVE Database V5

0

Not known to be exploited · CVSS 9.1 Critical.

Data as of 26 Oct 2026, 14:05 UTC

CVSS 3.1 base score
9.1Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
9.6% chance of exploitation in 30 days – higher than 95% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 23 Jul 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

AI-suggested

To mitigate this vulnerability, European organizations should immediately verify their SonicWall SMA 100 Series firmware versions and upgrade to a patched version once available from SonicWall. Until a patch is released, organizations should restrict administrative access to the management interface by implementing strict network segmentation and limiting access to trusted IP addresses only. Multi-factor authentication (MFA) should be enforced for all administrative accounts to reduce the risk of credential compromise. Monitoring and logging of administrative activities on the SMA devices should be enhanced to detect any suspicious file upload attempts or anomalous behavior. Additionally, organizations should conduct regular audits of uploaded files and configurations on these devices. Network intrusion detection systems (IDS) and endpoint detection and response (EDR) solutions should be tuned to identify potential exploitation attempts. Finally, organizations should review and harden their overall remote access policies and consider alternative secure remote access solutions if immediate patching is not feasible.

Description

An authenticated arbitrary file upload vulnerability exists in the SMA 100 series web management interface. A remote attacker with administrative privileges can exploit this flaw to upload arbitrary files to the system, potentially leading to remote code execution.

References

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