CVE-2010-3126

avast! Free Antivirus <5.0.594 - RCE

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2010-3126. PoCs published by diwr.

AI-analyzed exploit summary This exploit leverages DLL hijacking in avast! license files by replacing mfc90loc.dll with a malicious DLL that executes arbitrary code (e.g., calc.exe) when the license file is processed. It targets avast! versions <= 5.0.594 on Windows XP.

Description

Untrusted search path vulnerability in avast! Free Antivirus version 5.0.594 and earlier allows local users, and possibly remote attackers, to execute arbitrary code and conduct DLL hijacking attacks via a Trojan horse mfc90loc.dll that is located in the same folder as an avast license (.avastlic) file.

Exploits (1)

exploitdb WORKING POC
by diwr · clocalwindows
https://www.exploit-db.com/exploits/14743

This exploit leverages DLL hijacking in avast! license files by replacing mfc90loc.dll with a malicious DLL that executes arbitrary code (e.g., calc.exe) when the license file is processed. It targets avast! versions <= 5.0.594 on Windows XP.

Classification
Working Poc 90%
Attack Type
Rce
Complexity
Trivial
Reliability
Reliable
Target: avast! <= 5.0.594
No auth needed
Prerequisites: Access to place a malicious DLL in the same directory as an avast! license file · Victim must open or process the license file
MITRE ATT&CK
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (4)

Core 4
Core References
Vendor Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/41109
Vendor Advisory vdb-entry x_refsource_vupen
http://www.vupen.com/english/advisories/2010/2175
Exploit exploit x_refsource_exploit-db
http://www.exploit-db.com/exploits/14743
Third Party Advisory, VDB Entry vdb-entry signature x_refsource_oval
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7193

Scores

EPSS 0.0798
EPSS Percentile 94.0%

Details

Status published
Products (1)
avast/avast_antivirus_free < 5.0.594
Published Aug 26, 2010
Tracked Since Feb 18, 2026