What is the CVSS score of CVE-2025-45663?

CVE-2025-45663 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L. EPSS exploitation probability: 0.1%.

Which versions of Netsurf are affected by CVE-2025-45663?

Organizations using NetSurf should be aware of notable risk from CVE-2025-45663 rated CVSS 6.5. Exploitation could compromise the security of affected deployments.

Is there a public PoC exploit available for CVE-2025-45663?

Yes, a public proof-of-concept exploit is available for CVE-2025-45663. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2025-45663?

Within 7 days: Identify affected systems running NetSurf and apply vendor patches promptly. Monitor vendor channels for patch availability.

Netsurf CVE-2025-45663

MEDIUM

Improper Clearing of Heap Memory Before Release ('Heap Inspection') (CWE-244)

2025-11-03 cve@mitre.org

Information Disclosure Netsurf

6.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.5 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

Low

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:20 vuln.today

PoC Detected

Nov 05, 2025 - 18:19 vuln.today

Public exploit code

CVE Published

Nov 03, 2025 - 15:15 nvd

MEDIUM 6.5

DescriptionCVE.org

An issue in NetSurf v3.11 causes the application to read uninitialized heap memory when creating a dom_event structure.

AnalysisAI

An issue in NetSurf v3.11 causes the application to read uninitialized heap memory when creating a dom_event structure. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified under CWE-244. An issue in NetSurf v3.11 causes the application to read uninitialized heap memory when creating a dom_event structure. Affected products include: Netsurf-Browser Netsurf.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.