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CVE-2026-27748— Avira Internet Security Arbitrary File Deletion via Improper Link Resolution

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Software Updater组件存在链接解析不当问题，可能导致本地攻击者删除任意文件，进而引发本地权限提升、拒绝服务或系统完整性破坏。

CVSS 7.8 · High EPSS 0.19% · P8
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I. Basic Information for CVE-2026-27748

Vulnerability Information
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Vulnerability Title
Avira Internet Security Arbitrary File Deletion via Improper Link Resolution
Source: CVE Program / CVE List V5
Vulnerability Description
Avira Internet Security contains an improper link resolution vulnerability in the Software Updater component. During the update process, a privileged service running as SYSTEM deletes a file under C:\\ProgramData without validating whether the path resolves through a symbolic link or reparse point. A local attacker can create a malicious link to redirect the delete operation to an arbitrary file, resulting in deletion of attacker-chosen files with SYSTEM privileges. This may lead to local privilege escalation, denial of service, or system integrity compromise depending on the targeted file and operating system configuration.
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
在文件访问前对链接解析不恰当(链接跟随)
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Software Updater组件存在链接解析不当问题，可能导致本地攻击者删除任意文件，进而引发本地权限提升、拒绝服务或系统完整性破坏。
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-2026-27748

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III. Intelligence Information for CVE-2026-27748

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Vendor Advisories for CVE-2026-27748 (1)

Security Blog Posts for CVE-2026-27748 (1)

Vendor Pages for CVE-2026-27748 (1)

Same Patch Batch · Gen Digital Inc. · 2026-03-05 · 3 CVEs total

CVE-2026-27750 7.8 HIGH Avira Internet Security Optimizer TOCTOU
CVE-2026-27749 7.8 HIGH Avira Internet Security System Speedup Insecure Deserialization

IV. Related Vulnerabilities

Same product: Avira Internet Security
Same vendor: Gen Digital Inc.
Same weakness: CWE-59

V. Comments for CVE-2026-27748

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