CVE-2025-31103

HighRCE

Published: 31 March 2025

Published

31 March 2025

Modified

13 May 2025

KEV Added

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Patch

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CVSS Score 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Score 0.0058 69.0th percentile

Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-31103 is a high-severity Deserialization of Untrusted Data (CWE-502) vulnerability in Appleple A-Blog Cms. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 31.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-2 Flaw Remediation good match

prevent

Directly remediates the untrusted data deserialization vulnerability by applying vendor security updates that patch the flaw in a-blog CMS.

SI-10 Information Input Validation good match

prevent

Validates specially crafted requests containing malicious deserialization payloads before processing to prevent arbitrary file storage.

SI-7 Software, Firmware, and Information Integrity good match

detect

Performs integrity checks on software and files to detect unauthorized arbitrary file storage and subsequent script execution resulting from the deserialization flaw.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1505.003 Web Shell Persistence

Adversaries may backdoor web servers with web shells to establish persistent access to systems.

attack.mitre.org →

Why these techniques?

The unauthenticated remote deserialization flaw in public-facing a-blog CMS directly enables exploitation of the web application (T1190) and deployment of arbitrary scripts/files for server-side execution (T1505.003).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

NVD Description

Untrusted data deserialization vulnerability exists in a-blog cms. Processing a specially crafted request may store arbitrary files on the server where the product is running. This can be leveraged to execute an arbitrary script on the server.

Deeper analysisAI

CVE-2025-31103, published on 2025-03-31, is an untrusted data deserialization vulnerability in a-blog CMS, classified under CWE-502. The flaw allows processing of a specially crafted request to store arbitrary files on the server where the product is running. This can be leveraged to execute arbitrary scripts on the server, earning a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N).

Unauthenticated attackers can exploit the vulnerability remotely over the network with low attack complexity and no user interaction required. Successful exploitation enables arbitrary file storage and subsequent script execution on the server, resulting in high integrity impact without affecting confidentiality or availability.

Vendor advisories at https://developer.a-blogcms.jp/blog/news/entry-4197.html and https://developer.a-blogcms.jp/blog/news/security-update202503.html, along with JVN details at https://jvn.jp/en/jp/JVN66982699/, provide information on security updates and mitigation steps.