CVE-2025-70330: Easy Grade Pro 4.1.0.2 DoS Vulnerability

CVE-2025-70330 Overview

Easy Grade Pro 4.1.0.2 contains a file parsing logic flaw in the handling of proprietary .EGP gradebook files. By modifying specific fields at precise offsets within an otherwise valid .EGP file, an attacker can trigger an out-of-bounds memory read during parsing. This results in an unhandled access violation and application crash, leading to a local denial-of-service condition when the crafted file is opened by a user.

Critical Impact

Attackers can craft malicious .EGP gradebook files that cause Easy Grade Pro 4 to crash when opened, resulting in loss of availability for educators and administrative users relying on the application for grade management.

Affected Products

• Easy Grade Pro version 4.1.0.2

Discovery Timeline

• 2026-03-11 - CVE CVE-2025-70330 published to NVD
• 2026-03-12 - Last updated in NVD database

Technical Details for CVE-2025-70330

Vulnerability Analysis

This vulnerability is classified as CWE-125 (Out-of-Bounds Read), a memory corruption flaw that occurs when the application reads data past the boundaries of an allocated memory buffer. In the context of Easy Grade Pro 4, the parsing routine for .EGP gradebook files fails to properly validate field boundaries and offset values before accessing memory locations.

When a user opens a specially crafted .EGP file, the parser attempts to read data from memory locations that are outside the bounds of the allocated buffer. This occurs because the application trusts offset values embedded within the file structure without adequate bounds checking. The resulting memory access violation triggers an unhandled exception, causing the application to crash immediately.

The attack requires local access and user interaction—specifically, the victim must open the malicious gradebook file. While this limits the attack surface, it represents a credible threat in educational environments where .EGP files might be shared between educators or downloaded from untrusted sources.

Root Cause

The root cause of this vulnerability lies in improper input validation within the .EGP file parsing logic. The application fails to verify that offset values and field lengths specified within the file structure remain within the bounds of available memory. When processing a crafted file with manipulated offset fields, the parser follows these invalid pointers and attempts to read from unmapped or protected memory regions, triggering an access violation.

Attack Vector

The attack vector is local, requiring an attacker to deliver a malicious .EGP file to the victim. This could be accomplished through various means including email attachments, file sharing platforms, or compromised storage locations where educators store gradebook files. Once the victim opens the crafted file in Easy Grade Pro 4, the out-of-bounds read is triggered during file parsing, causing an immediate application crash.

The attacker would need to:

1. Obtain or create a valid .EGP gradebook file
2. Modify specific offset fields at precise locations within the file structure
3. Deliver the malicious file to the target user
4. Wait for the user to open the file with Easy Grade Pro 4

The vulnerability results in a denial-of-service condition, potentially causing loss of unsaved work and disrupting grade management workflows.

Detection Methods for CVE-2025-70330

Indicators of Compromise

• Unexpected crash events in Easy Grade Pro 4 application logs
• Windows Event Log entries showing access violation exceptions from EasyGradePro.exe
• Presence of .EGP files with anomalous file sizes or modification dates from untrusted sources
• User reports of application crashes when opening recently received gradebook files

Detection Strategies

• Monitor application crash reports for Easy Grade Pro 4 with exception codes indicating access violations
• Implement file integrity monitoring for directories containing .EGP gradebook files
• Deploy endpoint detection rules that alert on Easy Grade Pro process terminations with unhandled exception indicators
• Review email gateway logs for .EGP file attachments from external or suspicious sources

Monitoring Recommendations

• Enable Windows Error Reporting to capture crash dumps from Easy Grade Pro 4 for forensic analysis
• Configure endpoint protection solutions to monitor for suspicious file access patterns involving .EGP files
• Establish baseline application behavior metrics to detect anomalous crash frequencies
• Implement logging for file downloads and email attachments containing gradebook file extensions

How to Mitigate CVE-2025-70330

Immediate Actions Required

• Avoid opening .EGP files from untrusted or unknown sources until a patch is available
• Backup existing gradebook files before opening any recently received .EGP files
• Consider implementing file scanning or sandboxing for .EGP files received from external sources
• Educate users about the risks of opening gradebook files from unverified sources

Patch Information

At the time of publication, no vendor patch information is available for this vulnerability. Monitor the Easy.com Security Overview and Orbis Security Insights for updates regarding security patches for Easy Grade Pro 4. A proof-of-concept demonstrating this vulnerability is available at GitHub CVE-2025-70330 PoC.

Workarounds

• Implement strict controls on the sources from which .EGP files are accepted
• Use application sandboxing or virtualization when opening gradebook files from untrusted sources
• Consider temporarily using alternative grade management solutions until a patch is released
• Restrict .EGP file handling to isolated systems not connected to critical networks

# Example: Block .EGP files at the email gateway (adjust for your mail filter)
# Add to content filtering rules
BLOCK_EXTENSION=".egp"
LOG_ACTION="quarantine"
NOTIFY_ADMIN=true