Avast Antivirus
Monthly
Local privilege escalation in Avast Antivirus 25.11 allows non-privileged Windows users to execute arbitrary code as SYSTEM by abusing an unquoted service path in the SecureLine service. Publicly available exploit code exists (Exploit-DB 52510), and the issue was reported by VulnCheck; no public exploit identified at time of analysis indicates wider active exploitation, but the low-complexity local vector makes this attractive for post-compromise escalation.
Stack overflow in Gen Digital's shared antivirus scanning engine crashes the AV process when it parses a malformed Office Open XML (OOXML) file, causing a Denial-of-Service condition. The flaw affects Avast Antivirus, AVG Antivirus, Norton Antivirus, Avast One, and Avast Business Antivirus across Windows, macOS, and Linux - all products that consume the same Gen Digital VPS (virus definition) update stream. No active exploitation or public exploit code has been identified at time of analysis; the impact is limited to availability (AV process crash) with no confidentiality or integrity consequences.
Local code execution and denial-of-service in Gen Digital antivirus engines (Avast, AVG, Norton, Avast One, Avast Business Antivirus) on Windows, macOS, and Linux stems from a heap out-of-bounds read in the malformed-ZIP/XML scanner across virus definition builds 25020100 through 25021207. An attacker who lures a user into letting the on-access scanner process a crafted archive can crash the antivirus process or potentially execute code in its context. No public exploit identified at time of analysis and the EPSS signal was not provided.
Stack overflow via uncontrolled recursion crashes the antivirus scanning process across all Gen Digital consumer and business products when a crafted malformed PDF is scanned. Avast Antivirus, AVG Antivirus, Norton Antivirus, Avast One, and Avast Business Antivirus on Windows, macOS, and Linux are all affected through a shared Gen Digital virus definition engine (VPS builds before 25021208). An attacker who can place a specially crafted PDF on a target system - or deliver it via email or download - can force a denial-of-service of the antivirus process; no public exploit has been identified at time of analysis.
Local code execution or antivirus-process denial-of-service in Gen Digital's shared scanning engine (Avast Antivirus, AVG Antivirus, Norton Antivirus, Avast One, and Avast Business Antivirus on Windows, macOS, and Linux) is triggered when the engine parses a malformed Windows PE file and performs a heap out-of-bounds read. Mitigation ships via the VPS 25021310 virus definition update rather than a product installer, so any consumer of the Gen Digital definition stream at or above that build is no longer exposed. No public exploit identified at time of analysis, but the bug sits inside a high-privilege scanner that auto-processes attacker-controlled files.
Out-of-bounds heap read in the Gen Digital antivirus scanning engine (Avast, AVG, Norton, Avast One, Avast Business) allows a malformed Windows PE file with crafted .NET metadata to crash the AV process or potentially execute code locally on Windows, macOS, and Linux endpoints running virus definitions prior to VPS 25021310. No public exploit identified at time of analysis and the issue is not on the CISA KEV list, but the bug is reachable via on-access scanning, meaning any user who receives a malicious file may trigger it without explicit action. UI:R in the CVSS vector and the local attack vector temper the urgency relative to the 7.8 base score.
Stack use-after-free in the Gen Digital shared antivirus scanning engine crashes the antivirus process when it parses a malformed Windows PE file. Five Gen Digital products share a common virus definition update stream - Avast Antivirus, AVG Antivirus, Norton Antivirus, Avast One, and Avast Business Antivirus across Windows, macOS, and Linux - making all simultaneously vulnerable until the shared definition stream reaches build VPS 25022500. No public exploit has been identified at time of analysis; the impact is limited to a Denial-of-Service of the antivirus process with no confidentiality or integrity loss, and the CVSS score of 5.5 reflects the local, user-interaction-dependent nature of the attack.
Uncontrolled recursion in the Gen Digital shared scanning engine crashes the antivirus process when it encounters a specially crafted malformed Windows PE file, causing a Denial-of-Service across five Gen Digital products - Avast Antivirus, AVG Antivirus, Norton Antivirus, Avast One, and Avast Business Antivirus - on Windows, macOS, and Linux. The vulnerability resides in the virus definition update stream rather than the product binary itself, meaning all five products sharing the same Gen Digital VPS stream are simultaneously exposed until updated to definition build VPS 25031700 or later. No public exploit code has been identified at time of analysis, and CVSS scores this at medium severity (5.5) reflecting local access and required user interaction as meaningful limiting factors.
Heap out-of-bounds write in Gen Digital's shared antivirus scanning engine allows local code execution or denial of service when the engine parses a malformed Windows PE file, affecting Avast Antivirus, AVG Antivirus, Norton Antivirus, Avast One, and Avast Business Antivirus across Windows, macOS, and Linux on virus definition builds prior to VPS 25040308. Because the flaw lives in the scanner that typically runs with elevated privileges, successful exploitation can escalate to code execution in a high-privilege security context. No public exploit identified at time of analysis and the issue is not listed in CISA KEV.
Directory traversal vulnerability in Avast before 150918-0 allows remote attackers to delete or write to arbitrary files via a crafted entry in a ZIP archive. Rated medium severity (CVSS 6.4), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.
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!. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable. Epss exploitation probability 79.5% and no vendor patch available.
The TAR file parser in Avira AntiVir 7.11.1.163, Antiy Labs AVL SDK 2.0.3.7, avast!. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable. Epss exploitation probability 50.8% and no vendor patch available.
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. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable. Epss exploitation probability 50.2% and no vendor patch available.
Local privilege escalation in Avast Antivirus 25.11 allows non-privileged Windows users to execute arbitrary code as SYSTEM by abusing an unquoted service path in the SecureLine service. Publicly available exploit code exists (Exploit-DB 52510), and the issue was reported by VulnCheck; no public exploit identified at time of analysis indicates wider active exploitation, but the low-complexity local vector makes this attractive for post-compromise escalation.
Stack overflow in Gen Digital's shared antivirus scanning engine crashes the AV process when it parses a malformed Office Open XML (OOXML) file, causing a Denial-of-Service condition. The flaw affects Avast Antivirus, AVG Antivirus, Norton Antivirus, Avast One, and Avast Business Antivirus across Windows, macOS, and Linux - all products that consume the same Gen Digital VPS (virus definition) update stream. No active exploitation or public exploit code has been identified at time of analysis; the impact is limited to availability (AV process crash) with no confidentiality or integrity consequences.
Local code execution and denial-of-service in Gen Digital antivirus engines (Avast, AVG, Norton, Avast One, Avast Business Antivirus) on Windows, macOS, and Linux stems from a heap out-of-bounds read in the malformed-ZIP/XML scanner across virus definition builds 25020100 through 25021207. An attacker who lures a user into letting the on-access scanner process a crafted archive can crash the antivirus process or potentially execute code in its context. No public exploit identified at time of analysis and the EPSS signal was not provided.
Stack overflow via uncontrolled recursion crashes the antivirus scanning process across all Gen Digital consumer and business products when a crafted malformed PDF is scanned. Avast Antivirus, AVG Antivirus, Norton Antivirus, Avast One, and Avast Business Antivirus on Windows, macOS, and Linux are all affected through a shared Gen Digital virus definition engine (VPS builds before 25021208). An attacker who can place a specially crafted PDF on a target system - or deliver it via email or download - can force a denial-of-service of the antivirus process; no public exploit has been identified at time of analysis.
Local code execution or antivirus-process denial-of-service in Gen Digital's shared scanning engine (Avast Antivirus, AVG Antivirus, Norton Antivirus, Avast One, and Avast Business Antivirus on Windows, macOS, and Linux) is triggered when the engine parses a malformed Windows PE file and performs a heap out-of-bounds read. Mitigation ships via the VPS 25021310 virus definition update rather than a product installer, so any consumer of the Gen Digital definition stream at or above that build is no longer exposed. No public exploit identified at time of analysis, but the bug sits inside a high-privilege scanner that auto-processes attacker-controlled files.
Out-of-bounds heap read in the Gen Digital antivirus scanning engine (Avast, AVG, Norton, Avast One, Avast Business) allows a malformed Windows PE file with crafted .NET metadata to crash the AV process or potentially execute code locally on Windows, macOS, and Linux endpoints running virus definitions prior to VPS 25021310. No public exploit identified at time of analysis and the issue is not on the CISA KEV list, but the bug is reachable via on-access scanning, meaning any user who receives a malicious file may trigger it without explicit action. UI:R in the CVSS vector and the local attack vector temper the urgency relative to the 7.8 base score.
Stack use-after-free in the Gen Digital shared antivirus scanning engine crashes the antivirus process when it parses a malformed Windows PE file. Five Gen Digital products share a common virus definition update stream - Avast Antivirus, AVG Antivirus, Norton Antivirus, Avast One, and Avast Business Antivirus across Windows, macOS, and Linux - making all simultaneously vulnerable until the shared definition stream reaches build VPS 25022500. No public exploit has been identified at time of analysis; the impact is limited to a Denial-of-Service of the antivirus process with no confidentiality or integrity loss, and the CVSS score of 5.5 reflects the local, user-interaction-dependent nature of the attack.
Uncontrolled recursion in the Gen Digital shared scanning engine crashes the antivirus process when it encounters a specially crafted malformed Windows PE file, causing a Denial-of-Service across five Gen Digital products - Avast Antivirus, AVG Antivirus, Norton Antivirus, Avast One, and Avast Business Antivirus - on Windows, macOS, and Linux. The vulnerability resides in the virus definition update stream rather than the product binary itself, meaning all five products sharing the same Gen Digital VPS stream are simultaneously exposed until updated to definition build VPS 25031700 or later. No public exploit code has been identified at time of analysis, and CVSS scores this at medium severity (5.5) reflecting local access and required user interaction as meaningful limiting factors.
Heap out-of-bounds write in Gen Digital's shared antivirus scanning engine allows local code execution or denial of service when the engine parses a malformed Windows PE file, affecting Avast Antivirus, AVG Antivirus, Norton Antivirus, Avast One, and Avast Business Antivirus across Windows, macOS, and Linux on virus definition builds prior to VPS 25040308. Because the flaw lives in the scanner that typically runs with elevated privileges, successful exploitation can escalate to code execution in a high-privilege security context. No public exploit identified at time of analysis and the issue is not listed in CISA KEV.
Directory traversal vulnerability in Avast before 150918-0 allows remote attackers to delete or write to arbitrary files via a crafted entry in a ZIP archive. Rated medium severity (CVSS 6.4), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.
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!. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable. Epss exploitation probability 79.5% and no vendor patch available.
The TAR file parser in Avira AntiVir 7.11.1.163, Antiy Labs AVL SDK 2.0.3.7, avast!. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable. Epss exploitation probability 50.8% and no vendor patch available.
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. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable. Epss exploitation probability 50.2% and no vendor patch available.