Is CVE-2021-3273 in the CISA KEV catalog?

No. CVE-2021-3273 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3273?

CVE-2021-3273 has a CVSS v3 base score of 7.2 (HIGH).

What is the EPSS score for CVE-2021-3273?

CVE-2021-3273 has an EPSS score of 5.63% (92th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3273?

Upgrade nagios xi to 5.7 or later.

CVE & CISA-KEV Catalog

CVE-2021-3273

HIGHEPSS 92th pctl

7.2

CVSS v3

NVD

Description

Nagios XI below 5.7 is affected by code injection in the /nagiosxi/admin/graphtemplates.php component. To exploit this vulnerability, someone must have an admin user account in Nagios XI's web system.

CWE-94Code Injection

How to fix

Remediation Available

nagios xiNVD

Affected:< 5.7Fixed in:5.7CVE-2021-3273derived from NVD

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 RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

5.63%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

References

Exploit1

gist.github.com

Vendor Advisory1

nagios.com

Related Vulnerabilities

Other CWE-94 (Code Injection) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-9841	Critical	9.8	100%	KEV	Fix
CVE-2015-1635	Critical	9.8	100%	KEV	-
CVE-2022-22954	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-22204	Medium	6.8	100%	KEV	Fix
CVE-2025-3248	Critical	9.8	100%	KEV	Fix
CVE-2012-0158	High	8.8	100%	KEV	-

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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.