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CVE-2025-66331 is a denial-of-service vulnerability in Huawei’s office service, which handles document processing and collaboration. The flaw stems from inadequate input validation when parsing specific document formats, such as PDF or Office files. An attacker can exploit this by sending a maliciously crafted document via network-accessible interfaces like email attachments or file uploads. Upon processing, the service encounters a resource exhaustion condition, such as uncontrolled memory allocation or CPU spin, due to flaws in parsing logic. This triggers an infinite loop or buffer overflow, causing the service to crash or become unresponsive. The attack requires no authentication, allowing remote attackers to disrupt availability. The office service, integral to business workflows, fails to handle the malicious input, leading to complete service unavailability. This vulnerability affects the availability component of the CIA triad, with no evidence of data compromise or code execution. Huawei identified the issue in software versions where the office service is exposed. The impact is confined to denial of service, potentially causing significant downtime and productivity loss. Mitigation involves patching and network restrictions.
Platform: Huawei Office Service
Version: Multiple versions
Vulnerability: Denial of Service
Severity: Critical
date: 12/08/2025
Prediction: Patch expected Q1 2026
What Undercode Say:
curl -X POST -F "[email protected]" http://office-service/upload python3 -c "import socket; s=socket.socket(); s.connect(('target',port)); s.send(b'CRAFTED_DATA')" watch -n 1 'systemctl status office-service'
how Exploit:
Send crafted document to office service upload endpoint, causing parsing failure and resource exhaustion.
Protection from this CVE
Apply vendor patches, restrict network access, use input validation, monitor logs.
Impact:
Service disruption, downtime, productivity loss.
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Sources:
Reported By: nvd.nist.gov
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