What is the CVSS score of CVE-2025-55651?

CVE-2025-55651 has a CVSS 3.1 base score of 5.5 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

GPAC MP4Box CVE-2025-55651

MEDIUM

NULL Pointer Dereference (CWE-476)

2026-06-09 mitre

Denial Of Service Null Pointer Dereference N A

5.5

CVSS 3.1 · Vendor: mitre

Severity by source

Vendor (mitre) PRIMARY

5.5 MEDIUM

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

Primary rating from Vendor (mitre) · only source for this CVE.

CVSS VectorVendor: mitre

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Jun 10, 2026 - 15:36 vuln.today

CVSS changed

Jun 10, 2026 - 15:22 NVD

5.5 (MEDIUM)

CVE Published

Jun 09, 2026 - 00:00 nvd

UNKNOWN (no severity yet)

DescriptionCVE.org

A NULL pointer dereference in the gf_isom_get_user_data_count function (isomedia/isom_read.c) of GPAC MP4Box v2.4 allows attackers to cause a Denial of Service (DoS) via supplying a crafted MP4 file.

AnalysisAI

NULL pointer dereference in GPAC MP4Box v2.4 crashes the application when parsing a maliciously crafted MP4 file, enabling a Denial of Service against any user or pipeline that processes untrusted media with this tool. The flaw resides in gf_isom_get_user_data_count within isomedia/isom_read.c, where an unvalidated pointer is dereferenced during user-data atom counting. Publicly available exploit code exists as a crafted MP4 PoC, though no public exploit identified at time of analysis in CISA KEV and EPSS sits at the 5th percentile, suggesting minimal observed exploitation activity.

Technical ContextAI

GPAC is an open-source multimedia framework; MP4Box is its ISO Base Media File Format (ISOBMFF/MP4) muxing and analysis CLI tool. The vulnerable function gf_isom_get_user_data_count in isomedia/isom_read.c is responsible for traversing user-data (UDTA) boxes within an MP4 container to count embedded metadata entries. CWE-476 (NULL Pointer Dereference) indicates that a pointer - likely a box or track handle - is not validated before dereferencing, meaning a specially constructed MP4 that omits or malforms expected structures causes a null deref and process crash. The CPE data provided (cpe:2.3:a:n/a:n/a) is generic and not vendor-attributed by NVD, so version scope beyond the stated v2.4 is unconfirmed from available data.

RemediationAI

No vendor-released patch identified at time of analysis. No official GPAC security advisory was found among the provided references. As a compensating control, avoid passing untrusted or externally sourced MP4 files to MP4Box in automated pipelines - restrict input to files from trusted, integrity-verified sources only. For processing pipelines that must handle untrusted media, run MP4Box inside an isolated container or sandbox (e.g., seccomp-restricted Docker container or gVisor) to limit crash blast radius to the sandboxed process. If MP4Box is used interactively, advise users not to process MP4 files from unknown sources until a patch is confirmed. Monitor the GPAC GitHub repository (https://github.com/gpac/gpac) for commits addressing gf_isom_get_user_data_count in isomedia/isom_read.c as an indicator of an upstream fix.