How severe is CVE-2023-40720?

CVE-2023-40720 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability low.

Is CVE-2023-40720 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-40720?

CVE-2023-40720 primarily affects Fortinet Fortivoice. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-40720?

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-2023-40720 have an EU (EUVD) identifier?

Yes. CVE-2023-40720 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-45274.

When was CVE-2023-40720 published?

CVE-2023-40720 was published on 2024-05-14 and last updated on 2026-06-17.

CVE-2023-40720

CVE-2023-40720 is a high-severity vulnerability in Fortinet Fortivoice with a CVSS 3.x base score of 7.1. 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-639.

Key facts

Severity: High (CVSS 3.x base score 7.1)
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-45274
Weakness: CWE-639
Affected product: Fortinet Fortivoice
Published: 2024-05-14
Last modified: 2026-06-17

Description

An authorization bypass through user-controlled key vulnerability [CWE-639] in FortiVoiceEntreprise version 7.0.0 through 7.0.1 and before 6.4.8 allows an authenticated attacker to read the SIP configuration of other users via crafted HTTP or HTTPS requests.

Frequently asked questions

What is CVE-2023-40720?: An authorization bypass through user-controlled key vulnerability [CWE-639] in FortiVoiceEntreprise version 7.0.0 through 7.0.1 and before 6.4.8 allows an authenticated attacker to read the SIP configuration of other users via crafted HTTP or HTTPS requests.
How severe is CVE-2023-40720?: CVE-2023-40720 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability low.
Is CVE-2023-40720 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-40720?: CVE-2023-40720 primarily affects Fortinet Fortivoice. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-40720?: 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-2023-40720 have an EU (EUVD) identifier?: Yes. CVE-2023-40720 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-45274.
When was CVE-2023-40720 published?: CVE-2023-40720 was published on 2024-05-14 and last updated on 2026-06-17.

References

https://fortiguard.com/psirt/FG-IR-23-282

Affected products (3)

cpe:2.3:a:fortinet:fortivoice:*:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortivoice:7.0.0:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortivoice:7.0.1:*:*:*:*:*:*:*

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