AVG Anti-Virus for Linux 7.5.51, and possibly earlier, allows remote attackers to cause a denial of service (segmentation fault) or possibly execute arbitrary code via a malformed UPX compressed file, which triggers memory corruption.

Race condition in AVG Internet Security 9.0.791 on Windows XP allows local users to bypass kernel-mode hook handlers, and execute dangerous code that would otherwise be blocked by a handler but not blocked by signature-based malware detection, via certain user-space memory changes during hook-handler execution, aka an argument-switch attack or a KHOBE attack. NOTE: this issue is disputed by some third parties because it is a flaw in a protection mechanism for situations where a crafted program has already begun to execute

The RAR file parser in ClamAV 0.96.4, Rising Antivirus 22.83.00.03, Quick Heal (aka Cat QuickHeal) 11.00, G Data AntiVirus 21, AVEngine 20101.3.0.103 in Symantec Endpoint Protection 11, Command Antivirus 5.2.11.5, Ikarus Virus Utilities T3 Command Line Scanner 1.1.97.0, Emsisoft Anti-Malware 5.1.0.1, PC Tools AntiVirus 7.0.3.5, F-Prot Antivirus 4.6.2.117, VirusBuster 13.6.151.0, Fortinet Antivirus 4.2.254.0, Antiy Labs AVL SDK 2.0.3.7, K7 AntiVirus 9.77.3565, Trend Micro HouseCall 9.120.0.1004, Kaspersky Anti-Virus 7.0.0.125, Jiangmin Antivirus 13.0.900, Antimalware Engine 1.1.6402.0 in Microsoft Security Essentials 2.0, Sophos Anti-Virus 4.61.0, NOD32 Antivirus 5795, Avira AntiVir 7.11.1.163, Norman Antivirus 6.06.12, McAfee Anti-Virus Scanning Engine 5.400.0.1158, Panda Antivirus 10.0.2.7, McAfee Gateway (formerly Webwasher) 2010.1C, Trend Micro AntiVirus 9.120.0.1004, Comodo Antivirus 7424, Bitdefender 7.2, eSafe 7.0.17.0, F-Secure Anti-Virus 9.0.16160.0, nProtect Anti-Virus 2011-01-17.01, AhnLab V3 Internet Security 2011.01.18.00, AVG Anti-Virus 10.0.0.1190, avast! Antivirus 4.8.1351.0 and 5.0.677.0, and VBA32 3.12.14.2 allows user-assisted remote attackers to bypass malware detection via a RAR file with an initial MZ character sequence. NOTE: this may later be SPLIT into multiple CVEs if additional information is published showing that the error occurred independently in different RAR parser implementations.

The TAR file parser in AVG Anti-Virus 10.0.0.1190, Quick Heal (aka Cat QuickHeal) 11.00, Comodo Antivirus 7424, Emsisoft Anti-Malware 5.1.0.1, eSafe 7.0.17.0, F-Prot Antivirus 4.6.2.117, Fortinet Antivirus 4.2.254.0, Ikarus Virus Utilities T3 Command Line Scanner 1.1.97.0, Jiangmin Antivirus 13.0.900, Kaspersky Anti-Virus 7.0.0.125, McAfee Anti-Virus Scanning Engine 5.400.0.1158, McAfee Gateway (formerly Webwasher) 2010.1C, NOD32 Antivirus 5795, Norman Antivirus 6.06.12, Panda Antivirus 10.0.2.7, Rising Antivirus 22.83.00.03, Sophos Anti-Virus 4.61.0, AVEngine 20101.3.0.103 in Symantec Endpoint Protection 11, Trend Micro AntiVirus 9.120.0.1004, and Trend Micro HouseCall 9.120.0.1004 allows remote attackers to bypass malware detection via a TAR file with an appended ZIP file. NOTE: this may later be SPLIT into multiple CVEs if additional information is published showing that the error occurred independently in different TAR parser implementations.

The TAR file parser in Avira AntiVir 7.11.1.163, Antiy Labs AVL SDK 2.0.3.7, avast! Antivirus 4.8.1351.0 and 5.0.677.0, AVG Anti-Virus 10.0.0.1190, Bitdefender 7.2, Quick Heal (aka Cat QuickHeal) 11.00, ClamAV 0.96.4, Command Antivirus 5.2.11.5, Emsisoft Anti-Malware 5.1.0.1, eSafe 7.0.17.0, F-Prot Antivirus 4.6.2.117, G Data AntiVirus 21, Ikarus Virus Utilities T3 Command Line Scanner 1.1.97.0, Jiangmin Antivirus 13.0.900, K7 AntiVirus 9.77.3565, Kaspersky Anti-Virus 7.0.0.125, McAfee Anti-Virus Scanning Engine 5.400.0.1158, McAfee Gateway (formerly Webwasher) 2010.1C, Antimalware Engine 1.1.6402.0 in Microsoft Security Essentials 2.0, NOD32 Antivirus 5795, Norman Antivirus 6.06.12, PC Tools AntiVirus 7.0.3.5, Rising Antivirus 22.83.00.03, AVEngine 20101.3.0.103 in Symantec Endpoint Protection 11, Trend Micro AntiVirus 9.120.0.1004, Trend Micro HouseCall 9.120.0.1004, VBA32 3.12.14.2, and VirusBuster 13.6.151.0 allows remote attackers to bypass malware detection via a TAR archive entry with a length field that exceeds the total TAR file size. NOTE: this may later be SPLIT into multiple CVEs if additional information is published showing that the error occurred independently in different TAR parser implementations.

The TAR file parser in AhnLab V3 Internet Security 2011.01.18.00, Avira AntiVir 7.11.1.163, Antiy Labs AVL SDK 2.0.3.7, avast! Antivirus 4.8.1351.0 and 5.0.677.0, AVG Anti-Virus 10.0.0.1190, Bitdefender 7.2, Quick Heal (aka Cat QuickHeal) 11.00, ClamAV 0.96.4, Command Antivirus 5.2.11.5, Comodo Antivirus 7424, Emsisoft Anti-Malware 5.1.0.1, F-Prot Antivirus 4.6.2.117, F-Secure Anti-Virus 9.0.16160.0, Fortinet Antivirus 4.2.254.0, G Data AntiVirus 21, Ikarus Virus Utilities T3 Command Line Scanner 1.1.97.0, Jiangmin Antivirus 13.0.900, K7 AntiVirus 9.77.3565, Kaspersky Anti-Virus 7.0.0.125, McAfee Anti-Virus Scanning Engine 5.400.0.1158, McAfee Gateway (formerly Webwasher) 2010.1C, Antimalware Engine 1.1.6402.0 in Microsoft Security Essentials 2.0, NOD32 Antivirus 5795, Norman Antivirus 6.06.12, nProtect Anti-Virus 2011-01-17.01, Panda Antivirus 10.0.2.7, PC Tools AntiVirus 7.0.3.5, Rising Antivirus 22.83.00.03, Sophos Anti-Virus 4.61.0, AVEngine 20101.3.0.103 in Symantec Endpoint Protection 11, Trend Micro AntiVirus 9.120.0.1004, Trend Micro HouseCall 9.120.0.1004, VBA32 3.12.14.2, and VirusBuster 13.6.151.0 allows remote attackers to bypass malware detection via a TAR archive entry with a length field corresponding to that entire entry, plus part of the header of the next entry. NOTE: this may later be SPLIT into multiple CVEs if additional information is published showing that the error occurred independently in different TAR parser implementations.

The Gzip file parser in AVG Anti-Virus 10.0.0.1190, Bitdefender 7.2, Command Antivirus 5.2.11.5, Emsisoft Anti-Malware 5.1.0.1, F-Secure Anti-Virus 9.0.16160.0, Fortinet Antivirus 4.2.254.0, Ikarus Virus Utilities T3 Command Line Scanner 1.1.97.0, Jiangmin Antivirus 13.0.900, K7 AntiVirus 9.77.3565, Kaspersky Anti-Virus 7.0.0.125, McAfee Anti-Virus Scanning Engine 5.400.0.1158, McAfee Gateway (formerly Webwasher) 2010.1C, NOD32 Antivirus 5795, Norman Antivirus 6.06.12, Rising Antivirus 22.83.00.03, Sophos Anti-Virus 4.61.0, AVEngine 20101.3.0.103 in Symantec Endpoint Protection 11, Trend Micro AntiVirus 9.120.0.1004, Trend Micro HouseCall 9.120.0.1004, and VBA32 3.12.14.2 allows remote attackers to bypass malware detection via a .tar.gz file with multiple compressed streams. NOTE: this may later be SPLIT into multiple CVEs if additional information is published showing that the error occurred independently in different Gzip parser implementations.

The ZIP file parser in AhnLab V3 Internet Security 2011.01.18.00, AVG Anti-Virus 10.0.0.1190, Quick Heal (aka Cat QuickHeal) 11.00, Emsisoft Anti-Malware 5.1.0.1, eSafe 7.0.17.0, Fortinet Antivirus 4.2.254.0, Ikarus Virus Utilities T3 Command Line Scanner 1.1.97.0, Jiangmin Antivirus 13.0.900, Kaspersky Anti-Virus 7.0.0.125, Norman Antivirus 6.06.12, Sophos Anti-Virus 4.61.0, and AVEngine 20101.3.0.103 in Symantec Endpoint Protection 11 allows remote attackers to bypass malware detection via a ZIP file containing an invalid block of data at the beginning. NOTE: this may later be SPLIT into multiple CVEs if additional information is published showing that the error occurred independently in different ZIP parser implementations.

The Anti-theft service in AVG AntiVirus for Android allows physically proximate attackers to provide arbitrary location data via a "commonly available simple GPS location spoofer."

ScriptHelperApi in the AVG ScriptHelper ActiveX control in ScriptHelper.exe in AVG Secure Search toolbar before 18.1.7.598 and AVG Safeguard before 18.1.7.644 does not implement domain-based access control for method calls, which allows remote attackers to trigger the downloading and execution of arbitrary programs via a crafted web site.

The TDI driver (avgtdix.sys) in AVG Internet Security before 2013.3495 Hot Fix 18 and 2015.x before 2015.5315 and Protection before 2015.5315 allows local users to write to arbitrary memory locations, and consequently gain privileges, via a crafted 0x830020f8 IOCTL call.

AVG Internet Security 2015 allocates memory with Read, Write, Execute (RWX) permissions at predictable addresses when protecting user-mode processes, which allows attackers to bypass the DEP and ASLR protection mechanisms via unspecified vectors.

Code injection vulnerability in AVG Ultimate 17.1 (and earlier), AVG Internet Security 17.1 (and earlier), and AVG AntiVirus FREE 17.1 (and earlier) allows a local attacker to bypass a self-protection mechanism, inject arbitrary code, and take full control of any AVG process via a "DoubleAgent" attack. One perspective on this issue is that (1) these products do not use the Protected Processes feature, and therefore an attacker can enter an arbitrary Application Verifier Provider DLL under Image File Execution Options in the registry; (2) the self-protection mechanism is intended to block all local processes (regardless of privileges) from modifying Image File Execution Options for these products; and (3) this mechanism can be bypassed by an attacker who temporarily renames Image File Execution Options during the attack.

AVG AntiVirus for MacOS with scan engine before 4668 might allow remote attackers to bypass malware detection by leveraging failure to scan inside disk image (aka DMG) files.

An issue was discovered in Avast antivirus before 19.8 and AVG antivirus before 19.8. A DLL Preloading vulnerability allows an attacker to implant %WINDIR%\system32\wbemcomn.dll, which is loaded into a protected-light process (PPL) and might bypass some of the self-defense mechanisms. This affects all components that use WMI, e.g., AVGSvc.exe 19.6.4546.0 and TuneupSmartScan.dll 19.1.884.0.

A Cross Site Scripting (XSS) issue exists in AVG AntiVirus (Internet Security Edition) 19.3.3084 build 19.3.4241.440 in the Network Notification Popup, allowing an attacker to execute JavaScript code via an SSID Name.

XSS in the Video Downloader component before 1.5 of Avast Secure Browser 77.1.1831.91 and AVG Secure Browser 77.0.1790.77 allows websites to execute their code in the context of this component. While Video Downloader is technically a browser extension, it is granted a very wide set of privileges and can for example access cookies and browsing history, spy on the user while they are surfing the web, and alter their surfing experience in almost arbitrary ways.

Norton, Avira, Avast and AVG Antivirus for Windows may be susceptible to a Privilege Escalation vulnerability, which is a type of issue whereby an attacker may attempt to compromise the software application to gain elevated access to resources that are normally protected from an application or user.

Avast and AVG Antivirus for Windows were susceptible to a Time-of-check/Time-of-use (TOCTOU) vulnerability in the Quarantine process, leading to arbitrary file/directory deletion. The issue was fixed with Avast and AVG Antivirus version 22.11 and virus definitions from 14 February 2023 or later.

Avast and AVG Antivirus for Windows were susceptible to a Time-of-check/Time-of-use (TOCTOU) vulnerability in the restore process leading to arbitrary file creation. The issue was fixed with Avast and AVG Antivirus version 22.11

Avast and AVG Antivirus for Windows were susceptible to a NULL pointer dereference issue via RPC-interface. The issue was fixed with Avast and AVG Antivirus version 22.11

AVG AntiVirus Free AVGSvc Link Following Local Privilege Escalation Vulnerability. This vulnerability allows local attackers to escalate privileges on affected installations of AVG AntiVirus Free. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the AVG Service. By creating a symbolic link, an attacker can abuse the service to delete a file. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM. Was ZDI-CAN-22260.

AVG AntiVirus Free Link Following Denial-of-Service Vulnerability. This vulnerability allows local attackers to create a denial-of-service condition on affected installations of AVG AntiVirus Free. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the AVG Service. By creating a symbolic link, an attacker can abuse the service to create a folder. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. . Was ZDI-CAN-22803.

AVG AntiVirus Free icarus Arbitrary File Creation Denial of Service Vulnerability. This vulnerability allows local attackers to create a denial-of-service condition on affected installations of AVG AntiVirus Free. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the AVG Installer. By creating a symbolic link, an attacker can abuse the update functionality to create a file. An attacker can leverage this vulnerability to create a persistent denial-of-service condition on the system. Was ZDI-CAN-22942.

AVG AntiVirus Free AVGSvc Link Following Local Privilege Escalation Vulnerability. This vulnerability allows local attackers to escalate privileges on affected installations of AVG AntiVirus Free. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the AVG Service. By creating a symbolic link, an attacker can abuse the service to delete a folder. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM. Was ZDI-CAN-22960.