How severe is CVE-2021-41030?

CVE-2021-41030 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-41030 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-41030?

CVE-2021-41030 primarily affects Fortinet Forticlient Enterprise Management Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-41030?

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

When was CVE-2021-41030 published?

CVE-2021-41030 was published on 2021-12-08 and last updated on 2026-06-17.

CVE-2021-41030

CVE-2021-41030 is a medium-severity vulnerability in Fortinet Forticlient Enterprise Management Server with a CVSS 3.x base score of 5.4. 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-294.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 6.4
EPSS exploit prediction: 1% (57th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-294
Affected product: Fortinet Forticlient Enterprise Management Server
Published: 2021-12-08
Last modified: 2026-06-17

Description

An authentication bypass by capture-replay vulnerability [CWE-294] in FortiClient EMS versions 7.0.1 and below and 6.4.4 and below may allow an unauthenticated attacker to impersonate an existing user by intercepting and re-using valid SAML authentication messages.

Frequently asked questions

What is CVE-2021-41030?: An authentication bypass by capture-replay vulnerability [CWE-294] in FortiClient EMS versions 7.0.1 and below and 6.4.4 and below may allow an unauthenticated attacker to impersonate an existing user by intercepting and re-using valid SAML authentication messages.
How severe is CVE-2021-41030?: CVE-2021-41030 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-41030 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-41030?: CVE-2021-41030 primarily affects Fortinet Forticlient Enterprise Management Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-41030?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-41030 published?: CVE-2021-41030 was published on 2021-12-08 and last updated on 2026-06-17.

References

https://fortiguard.com/advisory/FG-IR-21-192

Affected products (3)

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

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