How severe is CVE-2025-40596?

CVE-2025-40596 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2025-40596 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 56% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-40596?

CVE-2025-40596 primarily affects Sonicwall Sma 500v Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-40596?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-40596 have an EU (EUVD) identifier?

Yes. CVE-2025-40596 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-22457.

When was CVE-2025-40596 published?

CVE-2025-40596 was published on 2025-07-23 and last updated on 2026-06-17.

CVE-2025-40596

CVE-2025-40596 is a high-severity vulnerability in Sonicwall Sma 500v Firmware with a CVSS 3.x base score of 7.3. Its EPSS exploit-prediction score of 56% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-121.

Key facts

Severity: High (CVSS 3.x base score 7.3)
EPSS exploit prediction: 56% (99th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-22457
Weakness: CWE-121
Affected product: Sonicwall Sma 500v Firmware
Published: 2025-07-23
Last modified: 2026-06-17

Description

A Stack-based buffer overflow vulnerability in the SMA100 series web interface allows remote, unauthenticated attacker to cause Denial of Service (DoS) or potentially results in code execution.

Frequently asked questions

What is CVE-2025-40596?: A Stack-based buffer overflow vulnerability in the SMA100 series web interface allows remote, unauthenticated attacker to cause Denial of Service (DoS) or potentially results in code execution.
How severe is CVE-2025-40596?: CVE-2025-40596 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2025-40596 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 56% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-40596?: CVE-2025-40596 primarily affects Sonicwall Sma 500v Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-40596?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-40596 have an EU (EUVD) identifier?: Yes. CVE-2025-40596 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-22457.
When was CVE-2025-40596 published?: CVE-2025-40596 was published on 2025-07-23 and last updated on 2026-06-17.

References

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2025-0012

Affected products (3)

cpe:2.3:o:sonicwall:sma_500v_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_210_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_410_firmware:*:*:*:*:*:*:*:*

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