Is CVE-2021-35478 in the CISA KEV catalog?

No. CVE-2021-35478 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-35478?

CVE-2021-35478 has a CVSS v3 base score of 5.4 (MEDIUM).

What is the EPSS score for CVE-2021-35478?

CVE-2021-35478 has an EPSS score of 76.62% (99th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-35478?

Upgrade log server to 2.1.9 or later.

CVE & CISA-KEV Catalog

CVE-2021-35478

MEDIUMEPSS 99th pctl

5.4

CVSS v3

NVD

Description

Nagios Log Server before 2.1.9 contains Reflected XSS in the dropdown box for the alert history and audit log function. All parameters used for filtering are affected. This affects users who open a crafted link or third-party web page.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

log serverNVD

Affected:< 2.1.9Fixed in:2.1.9CVE-2021-35478derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Exploit Intelligence

76.62%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

References

Exploit1

research.nccgroup.com

Vendor Advisory1

nagios.com

Third-Party Advisory1

research.nccgroup.com

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.