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CVE-2021-35478

61
FAUCET Score

CVE-2021-35478 describes a Reflected Cross-Site Scripting (XSS) vulnerability in Nagios Log Server versions prior to 2.1.9, specifically within the alert history and audit log dropdown boxes. This medium-severity vulnerability (CVSS 5.4) allows an authenticated attacker to inject malicious scripts via crafted links or third-party web pages, potentially leading to client-side code execution and limited impact on confidentiality and integrity. While the FAUCET Risk Score is high at 95/100, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.1.9CPE matchmatch criteria
cpe:2.3:a:nagios:log_server:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.4MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.3
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
76.62%
Probability of exploitation in next 30 days
EPSS Percentile
99.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.7662 is in the 100th percentile among its peer group of 15,225 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

research.nccgroup.com / 2021/07/22/technical-advisory-stored-and-reflected-xss-vulnerability-in-nagios-log-server-cve-2021-35478cve-2021-35479
ExploitThird Party Advisory
research.nccgroup.com
Third Party Advisory
nagios.com / downloads/nagios-log-server/change-log
Release NotesVendor Advisory