What is the CVSS score of CVE-2024-52875?

CVE-2024-52875 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 78.6%.

Is there a public PoC exploit available for CVE-2024-52875?

Yes, a public proof-of-concept exploit is available for CVE-2024-52875. Prioritise patching immediately. EPSS: 78.6%.

How to fix or mitigate CVE-2024-52875?

Within 7 days: Identify all affected systems running GFI Kerio Control 9.2.5 and apply vendor patches promptly. Monitor vendor channels for patch availability.

Kerio Control CVE-2024-52875

HIGH

HTTP Response Splitting (CWE-113)

2025-01-31 cve@mitre.org

XSS Open Redirect Kerio Control Gfi

8.8

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-113 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V1 - Encoding and Sanitization HTTP response header sanitization
Impact	CVSS 8.8, EPSS 78.6%, PoC available. Kerio Control is a firewall/UTM appliance managing network security for SMBs. Admin access to the firewall allows complete control over network traffic, VPN configurations, and security policies. The /nonauth/ pages are accessible without authentication by design.
Exploit ScenarioDerived	An attacker crafts a URL with a dest parameter containing CRLF injection and JavaScript payload. They send the link to a Kerio Control admin via email. When clicked, the JavaScript executes in the admin's browser context, stealing the session cookie. The attacker uses the session to modify firewall rules, create a VPN backdoor, and disable logging.

Act Now Prioritize within 24-48h. Why: HIGH severity + EPSS > 10%.

No patch listed yet 78.6% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 28, 2026

GFI Kerio Control versions 9.2.5 through 9.4.5 contain an HTTP response splitting vulnerability in the dest parameter of unauthenticated pages. The unsanitized parameter is used to generate Location headers in 302 redirects, enabling open redirect, HTTP response injection, and reflected XSS that can escalate to admin session hijacking.

Earlier versions of this analysis (1)

v1 Mar 28, 2026 - 18:06 CVSS 8.8

HTTP response splitting in GFI Kerio Control firewall management interface enables XSS-to-admin-takeover chain.

RemediationAI

Update Kerio Control to version 9.4.6 or later. Implement browser security headers (Content-Security-Policy, X-Content-Type-Options). Restrict admin interface access to trusted IP addresses. Educate administrators about phishing attacks targeting management interfaces.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The dest GET parameter on the /nonauth/addCertException.cs, /nonauth/guestConfirm.cs, and /nonauth/expiration.cs pages is injected into a Location HTTP header without sanitization. By injecting CRLF sequences followed by additional headers or HTML body content, an attacker achieves HTTP response splitting. This enables reflected XSS that can steal admin session cookies or execute actions in the admin context.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 8.8 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

PoC Detected

Sep 16, 2025 - 17:29 vuln.today

Public exploit code

CVE Published

Jan 31, 2025 - 08:15 nvd

HIGH 8.8

DescriptionCVE.org

An issue was discovered in GFI Kerio Control 9.2.5 through 9.4.5. The dest GET parameter passed to the /nonauth/addCertException.cs and /nonauth/guestConfirm.cs and /nonauth/expiration.cs pages is not properly sanitized before being used to generate a Location HTTP header in a 302 HTTP response. This can be exploited to perform Open Redirect or HTTP Response Splitting attacks, which in turn lead to Reflected Cross-Site Scripting (XSS). Remote command execution can be achieved by leveraging the upgrade feature in the admin interface.

Executive ViewAI

Why It Matters

Organizations using GFI Kerio Control 9.2.5 face significant risk from CVE-2024-52875 rated CVSS 8.8. Successful exploitation could significantly impact the confidentiality, integrity, or availability of affected systems. With an EPSS score of 79%, this vulnerability faces very high likelihood of exploitation. Organizations should apply vendor updates when available and consider compensating controls in the interim.

Business Impact: Severe

Compensating Controls

Apply vendor patch. If immediate patching is not feasible: (1) Implement network-level access controls to limit exposure; (2) Enable enhanced monitoring and alerting; (3) Apply principle of least privilege.

Threat Intelligence Overview

Threat Score

5.6/10

Composite threat intelligence

EPSS Score

78.6%

Top 1% exploitable

Exploit

POC

Public exploit code exists

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS POC (1)

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC Yes

EPSS 78.6%

Patch available No

Active threat Yes

Deciding rule

HIGH severity + EPSS > 10%

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.