How severe is CVE-2023-47539?

CVE-2023-47539 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-47539 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-47539?

CVE-2023-47539 affects Fortinet Fortimail. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-47539?

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

Does CVE-2023-47539 have an EU (EUVD) identifier?

Yes. CVE-2023-47539 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-51650.

When was CVE-2023-47539 published?

CVE-2023-47539 was published on 2025-03-18 and last updated on 2026-06-17.

CVE-2023-47539

CVE-2023-47539 is a critical-severity vulnerability in Fortinet Fortimail with a CVSS 3.x base score of 9.8. 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-284.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-51650
Weakness: CWE-284
Affected product: Fortinet Fortimail
Published: 2025-03-18
Last modified: 2026-06-17

Description

An improper access control vulnerability in FortiMail version 7.4.0 configured with RADIUS authentication and remote_wildcard enabled may allow a remote unauthenticated attacker to bypass admin login via a crafted HTTP request.

Frequently asked questions

What is CVE-2023-47539?: An improper access control vulnerability in FortiMail version 7.4.0 configured with RADIUS authentication and remote_wildcard enabled may allow a remote unauthenticated attacker to bypass admin login via a crafted HTTP request.
How severe is CVE-2023-47539?: CVE-2023-47539 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-47539 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-47539?: CVE-2023-47539 affects Fortinet Fortimail. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-47539?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2023-47539 have an EU (EUVD) identifier?: Yes. CVE-2023-47539 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-51650.
When was CVE-2023-47539 published?: CVE-2023-47539 was published on 2025-03-18 and last updated on 2026-06-17.

References

https://fortiguard.com/psirt/FG-IR-23-439

Affected products (1)

cpe:2.3:a:fortinet:fortimail:7.4.0:*:*:*:*:*:*:*

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