How severe is CVE-2019-16156?

CVE-2019-16156 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-2019-16156 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-2019-16156?

CVE-2019-16156 primarily affects Fortinet Fortiweb. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-16156?

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

When was CVE-2019-16156 published?

CVE-2019-16156 was published on 2020-03-12 and last updated on 2026-06-17.

CVE-2019-16156

CVE-2019-16156 is a medium-severity vulnerability in Fortinet Fortiweb with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Fortinet Fortiweb
Published: 2020-03-12
Last modified: 2026-06-17

Description

An Improper Neutralization of Input vulnerability in the Anomaly Detection Parameter Name in Fortinet FortiWeb 6.0.5, 6.2.0, and 6.1.1 may allow a remote unauthenticated attacker to perform a Cross Site Scripting attack (XSS).

Frequently asked questions

What is CVE-2019-16156?: An Improper Neutralization of Input vulnerability in the Anomaly Detection Parameter Name in Fortinet FortiWeb 6.0.5, 6.2.0, and 6.1.1 may allow a remote unauthenticated attacker to perform a Cross Site Scripting attack (XSS).
How severe is CVE-2019-16156?: CVE-2019-16156 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-2019-16156 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-2019-16156?: CVE-2019-16156 primarily affects Fortinet Fortiweb. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-16156?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-16156 published?: CVE-2019-16156 was published on 2020-03-12 and last updated on 2026-06-17.

References

https://fortiguard.com/advisory/FG-IR-19-265

Affected products (2)

cpe:2.3:a:fortinet:fortiweb:*:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiweb:6.2.0:*:*:*:*:*:*:*

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