CVE-2024-40764Network attack vector

Unauthenticated firewall crash via IPSec heap overflow

Published Jul 18, 2024 · Updated Aug 2, 2024

Heap-based buffer overflow in the SonicWall SonicOS IPSec VPN allows remote attackers to crash affected Gen6 and Gen7 firewalls. SonicWall identifies the IPSec VPN processing path but has not disclosed the packet field, parser, or copy operation that overruns heap storage. An unauthenticated network peer can reach the flaw with IPSec traffic; the documented consequence is a service-interrupting crash, with no reported data disclosure or modification.

CVSS severity7.5
High
EPSS probability0.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in the SonicWall SonicOS IPSec VPN allows remote attackers to crash affected Gen6 and Gen7 firewalls. SonicWall identifies the IPSec VPN processing path but has not disclosed the packet field, parser, or copy operation that overruns heap storage. An unauthenticated network peer can reach the flaw with IPSec traffic; the documented consequence is a service-interrupting crash, with no reported data disclosure or modification.

The record

CVE
CVE-2024-40764
Published
Jul 18, 2024
Updated
Aug 2, 2024
Vendor
SonicWall
Product
SonicOS
Classifications
CWE-787, CWE-122, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <=6.5.4.4-44v-21-2395
  2. Affected versionversion=0 <=7.0.1-5151
  3. Affected versionversion=0 <=7.1.1-7051
  4. Affected versionversion=6.5.4.4-44v-21-2395 and older versions
  5. Affected versionversion=7.0.1-5151 and older versions
  6. Affected versionversion=7.1.1-7051 and older versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SonicWall · SonicOSversion=0 <=6.5.4.4-44v-21-2395; version=0 <=7.0.1-5151; version=0 <=7.1.1-7051; version=6.5.4.4-44v-21-2395 and older versions; version=7.0.1-5151 and older versions; version=7.1.1-7051 and older versions

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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-787Out-of-bounds Write
CWE-122Heap-based Buffer Overflow
T1499.004Application or System Exploitation

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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