CVE-2025-40600Network attack vector

Unauthenticated service disruption via format string

Published Jul 29, 2025 · Updated Jul 30, 2025

Externally controlled format string handling in SonicWall SonicOS 7.2.0-7015 and earlier allows remote attackers to disrupt the SSL VPN service. The SSL VPN interface interprets externally supplied text as a format string instead of treating it solely as data. No authentication or user interaction is required; SonicWall has not disclosed the triggering field or whether disruption is a crash, hang, or reboot.

CVSS severity9.8
Critical
EPSS probability0.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Externally controlled format string handling in SonicWall SonicOS 7.2.0-7015 and earlier allows remote attackers to disrupt the SSL VPN service. The SSL VPN interface interprets externally supplied text as a format string instead of treating it solely as data. No authentication or user interaction is required; SonicWall has not disclosed the triggering field or whether disruption is a crash, hang, or reboot.

The record

CVE
CVE-2025-40600
Published
Jul 29, 2025
Updated
Jul 30, 2025
Vendor
SonicWall
Product
SonicOS
Classifications
CWE-134, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.2.0-7015 and older versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SonicWall · SonicOSversion=7.2.0-7015 and older versions

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-134Use of Externally-Controlled Format String
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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