CVE-2026-27749— Avira Internet Security System Speedup Insecure Deserialization
Quick assessment
Affected
Gen Digital Inc. Avira Internet Security
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Avira Internet Security是德国Avira公司的一款网络安全防护软件。 Avira Internet Security存在安全漏洞，该漏洞源于System Speedup组件反序列化不可信数据，可能导致本地攻击者以SYSTEM权限执行任意代码。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-27749
Vulnerability Information
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Vulnerability Title
Avira Internet Security System Speedup Insecure Deserialization
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
Avira Internet Security 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Avira Internet Security是德国Avira公司的一款网络安全防护软件。 Avira Internet Security存在安全漏洞，该漏洞源于System Speedup组件反序列化不可信数据，可能导致本地攻击者以SYSTEM权限执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Gen Digital Inc. | Avira Internet Security | 0 ~ 1.1.109.1990 | - |
|
II. Public POCs for CVE-2026-27749
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-27749 (1)
Security Blog Posts for CVE-2026-27749 (1)
-
Avira: Deserialize, Delete and Escalate - The Proper Way to Use an AV - Quarkslab's blog technical-description exploit
Vendor Pages for CVE-2026-27749 (1)
Same Patch Batch · Gen Digital Inc. · 2026-03-05 · 3 CVEs total
| CVE-2026-27748 | 7.8 HIGH | Avira Internet Security Arbitrary File Deletion via Improper Link Resolution |
| CVE-2026-27750 | 7.8 HIGH | Avira Internet Security Optimizer TOCTOU |
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V. Comments for CVE-2026-27749
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