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CVE-2018-8733

67
FAUCET Score

CVE-2018-8733 is a critical authentication bypass vulnerability affecting Nagios XI versions 5.2.x through 5.4.12. This flaw allows an unauthenticated attacker to make configuration changes and leverage an authenticated SQL injection vulnerability, ultimately leading to remote code execution. With a CVSS score of 9.8 (CRITICAL) and an EPSS score indicating high exploitability, this vulnerability poses a severe risk. Exploit code is publicly available through Metasploit and ExploitDB, and there is significant community discussion, though it is not currently listed on the KEV catalog.

Impacted Technologies

VendorProductVersion(s)CPE
>= 5.2.0, < 5.4.13CPE matchmatch criteria
cpe:2.3:a:nagios:nagios_xi:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
27.51%
Probability of exploitation in next 30 days
EPSS Percentile
97.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Metasploit: Nagios XI Chained Remote Code Execution · Mar 6, 2016
ExploitDB: EDB-44969 · Jul 2, 2018
This CVE's current EPSS score of 0.2751 is in the 95th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

assets.nagios.com / downloads/nagiosxi/CHANGES-5.TXT
Release NotesVendor Advisory
blog.redactedsec.net / exploits/2018/04/26/nagios.html
ExploitTechnical DescriptionThird Party Advisory
gist.github.com / caleBot/f0a93b5a98574393e0139104eacc2d0f
Third Party Advisory
exploit-db.com / exploits/44560
ExploitThird Party AdvisoryVDB Entry
exploit-db.com / exploits/44969
ExploitThird Party AdvisoryVDB Entry
nagios.com / downloads/nagios-xi/change-log
Release NotesVendor Advisory