CVE-2025-45663

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

6.5 Medium

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

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: None
Availability: Low

Exploit likelihood

0.37%Up 0.3 points since Nov 4, 2025

What each source reports

CVE List Score used 6.5

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

Record: CVE-2025-45663
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Weakness: CWE-244
Updated: 2026-11-02

EUVDEUVD-2025-37484 6.5

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

Record: EUVD-2025-37484
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Updated: 2026-11-02

GitHub AdvisoriesGHSA-8m64-p66f-h4hv 6.5

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

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

Record: GHSA-8m64-p66f-h4hv
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Weakness: CWE-244
Updated: 2026-11-02

NVD 6.5

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

Record: CVE-2025-45663
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Weakness: CWE-244
Updated: 2026-11-05

OSV 6.5

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

Record: CVE-2025-45663
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Updated: 2026-11-07

OSVDEBIAN-CVE-2025-45663 6.5

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

Record: DEBIAN-CVE-2025-45663
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Updated: 2026-11-02

OSVUBUNTU-CVE-2025-45663 6.5

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

Record: UBUNTU-CVE-2025-45663
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Updated: 2026-11-02

Affected products

netsurf-browser netsurf

Affected packages

Affected packages
Package	Affected	Fixed
`netsurf` Debian:12	All versions, plus listed versions 3.10-13.10-23.10-33.10-3.13.11-13.11-23.11-33.11-4	None known
`netsurf` Debian:13	All versions, plus listed versions 3.11-23.11-33.11-4	None known
`netsurf` Debian:14	All versions, plus listed versions 3.11-23.11-33.11-4	None known
`netsurf` Ubuntu:16.04:LTS	All versions, plus listed versions 3.2+dfsg-2.2build1	None known
`netsurf` Ubuntu:20.04:LTS	All versions, plus listed versions 3.6-3.2	None known
`netsurf` Ubuntu:22.04:LTS	All versions, plus listed versions 3.10-13.10-1build1	None known
`netsurf` Ubuntu:24.04:LTS	All versions, plus listed versions 3.10-3.13.11-13.11-1build43.11-1build5	None known
`netsurf` Ubuntu:25.10	All versions, plus listed versions 3.11-2	None known
`netsurf` Ubuntu:26.10	All versions, plus listed versions 3.11-33.11-43.11-4ubuntu1	None known
`netsurf` Ubuntu:26.04:LTS	All versions, plus listed versions 3.11-23.11-3	None known

History

History
Recorded	Changed	Sources
Nov 5, 2026	facts	NVD
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-45663 is a medium vulnerability (CVSS 6.5) in Netsurf-browser Netsurf, published November 3, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.37%, the 31st percentile. No source names a fixed version.

References

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