How severe is CVE-2017-3133?

CVE-2017-3133 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2017-3133 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-3133?

CVE-2017-3133 affects Fortinet Fortios. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-3133?

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

When was CVE-2017-3133 published?

CVE-2017-3133 was published on 2017-09-12 and last updated on 2026-06-17.

CVE-2017-3133

CVE-2017-3133 is a medium-severity vulnerability in Fortinet Fortios with a CVSS 3.x base score of 6.1. Its EPSS exploit-prediction score of 11% places it in the 95th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 11% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Fortinet Fortios
Published: 2017-09-12
Last modified: 2026-06-17

Description

A Cross-Site Scripting vulnerability in Fortinet FortiOS versions 5.6.0 and earlier allows attackers to execute unauthorized code or commands via the Replacement Message HTML for SSL-VPN.

Frequently asked questions

What is CVE-2017-3133?: A Cross-Site Scripting vulnerability in Fortinet FortiOS versions 5.6.0 and earlier allows attackers to execute unauthorized code or commands via the Replacement Message HTML for SSL-VPN.
How severe is CVE-2017-3133?: CVE-2017-3133 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2017-3133 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-3133?: CVE-2017-3133 affects Fortinet Fortios. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-3133?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-3133 published?: CVE-2017-3133 was published on 2017-09-12 and last updated on 2026-06-17.

References

Affected products (1)

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

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