Gen Digital Avira Internet Security up to 1.1.109.1990 Software Updater link following

CVSS Meta Temp Score
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CTI Interest Score
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7.6$0-$5k0.00

Summaryinfo

A vulnerability was found in Gen Digital Avira Internet Security up to 1.1.109.1990. It has been rated as critical. Affected by this vulnerability is an unknown functionality of the component Software Updater. This manipulation causes link following. This vulnerability is registered as CVE-2026-27748. The attack needs to be launched locally. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in Gen Digital Avira Internet Security up to 1.1.109.1990 and classified as critical. Affected by this vulnerability is an unknown function of the component Software Updater. The manipulation with an unknown input leads to a link following vulnerability. The CWE definition for the vulnerability is CWE-59. The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was published by Quarkslab. It is possible to read the advisory at blog.quarkslab.com. This vulnerability is known as CVE-2026-27748 since 02/23/2026. The exploitation appears to be easy. Attacking locally is a requirement. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/13/2026).

Upgrading to version 1.1.114.3113 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-0618). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Avira Internet Security Suite

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.5

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.1
NVD Vector: 🔒

CNA Base Score: 7.8
CNA Vector (VulnCheck): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Link following
CWE: CWE-59
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Avira Internet Security 1.1.114.3113

Timelineinfo

02/23/2026 CVE reserved
03/05/2026 +10 days Advisory disclosed
03/05/2026 +0 days VulDB entry created
03/13/2026 +8 days VulDB entry last update

Sourcesinfo

Advisory: blog.quarkslab.com
Researcher: Quarkslab
Status: Confirmed

CVE: CVE-2026-27748 (🔒)
GCVE (CVE): GCVE-0-2026-27748
GCVE (VulDB): GCVE-100-349195
CERT Bund: WID-SEC-2026-0618 - Avira Internet Security Suite: Mehrere Schwachstellen

Entryinfo

Created: 03/05/2026 16:07
Updated: 03/13/2026 02:39
Changes: 03/05/2026 16:07 (68), 03/07/2026 22:50 (10), 03/08/2026 22:29 (7), 03/13/2026 02:39 (11)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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