Is CVE-2025-55398 actively exploited?

No active exploitation of CVE-2025-55398 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2025-55398 be exploited remotely?

Yes. CVE-2025-55398 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2025-55398?

CVE-2025-55398 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2025-55398

CRITICAL

CVE-2025-55398

CWE-1284Published: August 22, 2025· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

An issue was discovered in mouse07410 asn1c thru 0.9.29 (2025-03-20) - a fork of vlm asn1c. In UPER (Unaligned Packed Encoding Rules), asn1c-generated decoders fail to enforce INTEGER constraints when the bound is positive and exceeds 32 bits in length, potentially allowing incorrect or malicious input to be processed.

NVD Source

Technical Analysis

CVE-2025-55398 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.