CVE-2021-35479

Nagios Log Server before 2.1.9 contains Stored XSS in the custom column view for the alert...

5.4 Medium

Nagios Log Server before 2.1.9 contains Stored XSS in the custom column view for the alert history and audit log function through the affected pp parameter. This affects users who open a crafted link or third-party web page.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

13.2%Up 12.3 points since Jul 28, 2021

What each source reports

NVD Score used 5.4

Record: CVE-2021-35479
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0: 3.5 LowAV:N/AC:M/Au:S/C:N/I:P/A:N
Weakness: CWE-79
Updated: 2026-11-02

CVE List No score

Record: CVE-2021-35479
Updated: 2026-11-02

EUVDEUVD-2021-22121 No score

Record: EUVD-2021-22121
Updated: 2026-11-03

GitHub AdvisoriesGHSA-h4gp-5m6g-cpc7 No score

Nagios Log Server before 2.1.9 contains Stored XSS in the custom column view for the alert...

Record: GHSA-h4gp-5m6g-cpc7
Weakness: CWE-79
Updated: 2026-11-02

Affected products

nagios log server

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-35479 is a medium vulnerability (CVSS 5.4) in Nagios Log Server, published July 27, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 13.2%, the 96th percentile. No source names a fixed version.