How severe is CVE-2023-42786?

CVE-2023-42786 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-42786 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-42786?

CVE-2023-42786 affects Fortinet Fortios. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-42786?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2023-42786 have an EU (EUVD) identifier?

Yes. CVE-2023-42786 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-47216.

When was CVE-2023-42786 published?

CVE-2023-42786 was published on 2025-01-14 and last updated on 2026-06-17.

CVE-2023-42786

CVE-2023-42786 is a medium-severity vulnerability in Fortinet Fortios with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-47216
Weakness: CWE-476
Affected product: Fortinet Fortios
Published: 2025-01-14
Last modified: 2026-06-17

Description

A null pointer dereference in FortiOS versions 7.4.0 through 7.4.1, 7.2.0 through 7.2.5, 7.0 all versions, 6.4 all versions , 6.2 all versions and 6.0 all versions allows attacker to trigger a denial of service via a crafted http request.

Frequently asked questions

What is CVE-2023-42786?: A null pointer dereference in FortiOS versions 7.4.0 through 7.4.1, 7.2.0 through 7.2.5, 7.0 all versions, 6.4 all versions , 6.2 all versions and 6.0 all versions allows attacker to trigger a denial of service via a crafted http request.
How severe is CVE-2023-42786?: CVE-2023-42786 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-42786 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-42786?: CVE-2023-42786 affects Fortinet Fortios. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-42786?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2023-42786 have an EU (EUVD) identifier?: Yes. CVE-2023-42786 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-47216.
When was CVE-2023-42786 published?: CVE-2023-42786 was published on 2025-01-14 and last updated on 2026-06-17.

References

https://fortiguard.fortinet.com/psirt/FG-IR-23-293

Affected products (1)

cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*

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