How severe is CVE-2020-6644?

CVE-2020-6644 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-6644 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-6644?

CVE-2020-6644 affects Fortinet Fortideceptor. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-6644?

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.

When was CVE-2020-6644 published?

CVE-2020-6644 was published on 2020-06-22 and last updated on 2026-06-17.

CVE-2020-6644

CVE-2020-6644 is a high-severity vulnerability in Fortinet Fortideceptor with a CVSS 3.x base score of 8.1. 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-613.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 6.8
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-613
Affected product: Fortinet Fortideceptor
Published: 2020-06-22
Last modified: 2026-06-17

Description

An insufficient session expiration vulnerability in FortiDeceptor 3.0.0 and below allows an attacker to reuse the unexpired admin user session IDs to gain admin privileges, should the attacker be able to obtain that session ID via other, hypothetical attacks.

Frequently asked questions

What is CVE-2020-6644?: An insufficient session expiration vulnerability in FortiDeceptor 3.0.0 and below allows an attacker to reuse the unexpired admin user session IDs to gain admin privileges, should the attacker be able to obtain that session ID via other, hypothetical attacks.
How severe is CVE-2020-6644?: CVE-2020-6644 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-6644 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-6644?: CVE-2020-6644 affects Fortinet Fortideceptor. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-6644?: 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.
When was CVE-2020-6644 published?: CVE-2020-6644 was published on 2020-06-22 and last updated on 2026-06-17.

References

https://fortiguard.com/advisory/FG-IR-20-006

Affected products (1)

cpe:2.3:a:fortinet:fortideceptor:*:*:*:*:*:*:*:*

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