How severe is CVE-2020-16157?

CVE-2020-16157 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2020-16157 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 14% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-16157?

CVE-2020-16157 affects Nagios Log Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-16157?

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

When was CVE-2020-16157 published?

CVE-2020-16157 was published on 2020-07-30 and last updated on 2026-06-17.

CVE-2020-16157

CVE-2020-16157 is a medium-severity vulnerability in Nagios Log Server with a CVSS 3.x base score of 5.4. Its EPSS exploit-prediction score of 14% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 14% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Nagios Log Server
Published: 2020-07-30
Last modified: 2026-06-17

Description

A Stored XSS vulnerability exists in Nagios Log Server before 2.1.7 via the Notification Methods -> Email Users menu.

Frequently asked questions

What is CVE-2020-16157?: A Stored XSS vulnerability exists in Nagios Log Server before 2.1.7 via the Notification Methods -> Email Users menu.
How severe is CVE-2020-16157?: CVE-2020-16157 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2020-16157 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 14% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-16157?: CVE-2020-16157 affects Nagios Log Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-16157?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-16157 published?: CVE-2020-16157 was published on 2020-07-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nagios:log_server:*:*:*:*:*:*:*:*

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