CVE-2023-7319VulnerabilityPublished 30 Oct 2025Updated 17 Nov 2025

CVE-2023-7319: Nagios Network Analyzer · XSS or 'Cross-site Scripting'

Affects Nagios Network AnalyzerSource CVE Database V5

Not known to be exploited · CVSS 5.1 Medium.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 4.0 base score

5.1Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.5% chance of exploitation in 30 days – higher than 43% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: Low
User Interaction: Passive
Vulnerable system confidentiality: None
Vulnerable system integrity: None
Vulnerable system availability: None
Subsequent system confidentiality: Low
Subsequent system integrity: Low
Subsequent system availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: Low: The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction: Passive: Successful exploitation of this vulnerability requires limited interaction by the targeted user with the vulnerable system and the attacker’s payload. These interactions would be considered involuntary and do not require that the user actively subvert protections built into the vulnerable system.
Vulnerable system confidentiality: None: There is no loss of confidentiality within the Vulnerable System.
Vulnerable system integrity: None: There is no loss of integrity within the Vulnerable System.
Vulnerable system availability: None: There is no impact to availability within the Vulnerable System.
Subsequent system confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the Subsequent System.
Subsequent system integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact to the Subsequent System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 30 Oct 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Nagios Network Analyzer	Affected =0	Fixed in–

AI-suggested

European organizations should implement the following specific mitigation measures: 1) Upgrade Nagios Network Analyzer to version 2024R1 or later as soon as the patch is available to eliminate the vulnerability. 2) Until a patch is applied, restrict access to the Percentile Calculator menu to trusted users and limit exposure by network segmentation or firewall rules. 3) Implement strict input validation and output encoding on all user inputs within the application, particularly in custom or extended deployments. 4) Deploy Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in the browser context. 5) Educate users to recognize and avoid clicking on suspicious links that could trigger XSS attacks. 6) Monitor web server and application logs for unusual input patterns or attempted script injections. 7) Consider using web application firewalls (WAFs) with rules tailored to detect and block XSS payloads targeting Nagios Network Analyzer. These steps will reduce the attack surface and mitigate the risk until a full patch is applied.

Description

CVE-2023-7319 is a medium-severity cross-site scripting (XSS) vulnerability affecting Nagios Network Analyzer versions prior to 2024R1. The flaw exists in the Percentile Calculator menu due to improper input validation and escaping, allowing attackers to inject malicious scripts that execute in the context of a victim's browser. Exploitation requires no authentication but does require user interaction, such as clicking a crafted link. While no known exploits are currently reported in the wild, successful attacks could lead to session hijacking, credential theft, or unauthorized actions within the application. The vulnerability has a CVSS 4.0 base score of 5.1, reflecting moderate impact and ease of exploitation. European organizations using Nagios Network Analyzer should prioritize patching or mitigating this issue to prevent potential compromise. Countries with significant Nagios Network Analyzer adoption and critical infrastructure monitoring are at higher risk. Mitigation includes applying vendor updates upon release, implementing strict input validation, employing Content Security Policy (CSP), and educating users about phishing risks.

Impact

For European organizations, this vulnerability could have significant consequences, especially for those relying on Nagios Network Analyzer to monitor critical network infrastructure. Successful exploitation could allow attackers to execute malicious scripts in the context of authenticated users, potentially leading to session hijacking, unauthorized access to sensitive monitoring data, or manipulation of network analysis results. This could degrade the integrity and confidentiality of network monitoring operations, impacting incident response and network reliability. Organizations in sectors such as finance, energy, telecommunications, and government are particularly at risk due to their reliance on continuous and accurate network monitoring. Additionally, the vulnerability could be leveraged as a foothold for further attacks within the network if attackers gain access to administrative sessions. Although the vulnerability does not directly affect system availability, the indirect effects on operational security and trustworthiness of monitoring data could be substantial.

Summary

CVE-2023-7319 is a cross-site scripting (XSS) vulnerability identified in Nagios Network Analyzer, a widely used network monitoring and analysis tool. The vulnerability specifically affects versions prior to 2024R1 and resides in the Percentile Calculator menu, where user-supplied input is not properly validated or escaped before being incorporated into web pages. This improper neutralization of input (CWE-79) allows an attacker to inject arbitrary JavaScript code that executes in the context of the victim's browser session. The vulnerability is remotely exploitable over the network without requiring authentication, but it does require user interaction, such as clicking on a maliciously crafted URL or link. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:L), and user interaction required (UI:P). The impact is limited to confidentiality and integrity within the browser context, with no direct impact on availability or system-level privileges. Although no known exploits are currently reported in the wild, the vulnerability poses a risk of session hijacking, theft of sensitive information, or execution of unauthorized actions within the Nagios Network Analyzer interface. The lack of vendor patch links suggests that a fix may be forthcoming or that users should upgrade to version 2024R1 or later. The vulnerability’s medium severity score (5.1) reflects the moderate risk posed by this XSS flaw in a critical network monitoring product.

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #1OWASP Top 10 A05:2025: Injection (opens in a new tab)
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Implementation · Architecture and Design
Understand the context in which your data will be used and the encoding that will be expected. This is especially important when transmitting data between different components, or when generating outputs that can contain multiple encodings at the same time, such as web pages or multi-part mail messages.
Architecture and Design · Implementation · Attack Surface Reduction
Understand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide…
OWASP Cheat Sheets
Cross Site Scripting Prevention (opens in a new tab)
DOM based XSS Prevention (opens in a new tab)
Injection Prevention (opens in a new tab)
Abuse Case (opens in a new tab)
Deserialization (opens in a new tab)
OWASP ASVS 4.0.3
V5.3.3 (opens in a new tab)
V1.5.1 (opens in a new tab)
Attack patterns
XSS Using MIME Type Mismatch (opens in a new tab)
DOM-Based XSS (opens in a new tab)
Reflected XSS (opens in a new tab)
Stored XSS (opens in a new tab)
Cross-Site Scripting (XSS) (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 24 Nov 2025, 22:17 UTC

WeaknessesCWE-79

Technical details

References

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