Internet Security
CVE-2026-27749
HIGH
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Avira Internet Security contains a deserialization of untrusted data vulnerability in the System Speedup component. The Avira.SystemSpeedup.RealTimeOptimizer.exe process, which runs with SYSTEM privileges, deserializes data from a file located in C:\\ProgramData using .NET BinaryFormatter without implementing input validation or deserialization safeguards. Because the file can be created or modified by a local user in default configurations, an attacker can supply a crafted serialized payload that is deserialized by the privileged process, resulting in arbitrary code execution as SYSTEM.
AnalysisAI
Arbitrary code execution as SYSTEM in Avira Internet Security's System Speedup component occurs when the privileged RealTimeOptimizer.exe process deserializes untrusted .NET binary data from a world-writable ProgramData location without validation. A local attacker can craft a malicious serialized payload to achieve immediate privilege escalation and full system compromise. No patch is currently available for this high-severity vulnerability.
Technical ContextAI
Classified as CWE-502 (Deserialization of Untrusted Data). Affects the System Speedup component of Internet Security. Avira Internet Security contains a deserialization of untrusted data vulnerability in the System Speedup component. The Avira.SystemSpeedup.RealTimeOptimizer.exe process, which runs with SYSTEM privileges, deserializes data from a file located in C:\\ProgramData using .NET BinaryFormatter without implementing input validation or deserialization safeguards. Because the file can be created or modified by a local user in default configurations, an attacker can supply a crafted serialized payload th
RemediationAI
Monitor vendor advisories for a patch.
More in Internet Security
View allStack-based buffer overflow in Quick Heal Internet Security 10.1.0.316 and earlier, Total Security 10.1.0.316 and earlie
Beijing Huorong Internet Security 5.0.55.2 allows a non-admin user to escalate privileges by injecting code into a proce
A vulnerability, which was classified as critical, has been found in Comodo Internet Security Premium 12.3.4.8162. This
A vulnerability classified as critical was found in Comodo Internet Security Premium 12.3.4.8162. This vulnerability aff
Local privilege escalation vulnerability potentially allowed an attacker to misuse ESET’s file operations to delete file
Trend Micro uiAirSupport, included in the Trend Micro Security 2023 family of consumer products, version 6.0.2092 and be
The TDI driver (avgtdix.sys) in AVG Internet Security before 2013.3495 Hot Fix 18 and 2015.x before 2015.5315 and Protec
bdagent.sys in BullGuard Antivirus, Internet Security, Premium Protection, and Online Backup before 15.0.288 allows loca
Comodo Antivirus through 12.0.0.6870, Comodo Firewall through 12.0.0.6870, and Comodo Internet Security Premium through
AVG Internet Security 2015 allocates memory with Read, Write, Execute (RWX) permissions at predictable addresses when pr
Quick Heal Internet Security 10.1.0.316, Quick Heal Total Security 10.1.0.316, and Quick Heal AntiVirus Pro 10.1.0.316 a
Quick Heal Internet Security 10.1.0.316, Quick Heal Total Security 10.1.0.316, and Quick Heal AntiVirus Pro 10.1.0.316 a
Same weakness CWE-502 – Deserialization of Untrusted Data
View allSame technique Deserialization
View allShare
External POC / Exploit Code
Leaving vuln.today