Gen Digital Avira Internet Security up to 1.1.109.1990 System Speedup Avira.SystemSpeedup.RealTimeOptimizer.exe deserialization

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

Summaryinfo

A vulnerability categorized as critical has been discovered in Gen Digital Avira Internet Security up to 1.1.109.1990. Affected by this issue is some unknown functionality of the file Avira.SystemSpeedup.RealTimeOptimizer.exe of the component System Speedup Component. Such manipulation leads to deserialization. This vulnerability is documented as CVE-2026-27749. The attack needs to be performed locally. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Gen Digital Avira Internet Security up to 1.1.109.1990 and classified as critical. Affected by this issue is an unknown functionality of the file Avira.SystemSpeedup.RealTimeOptimizer.exe of the component System Speedup Component. The manipulation with an unknown input leads to a deserialization vulnerability. Using CWE to declare the problem leads to CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was released by Quarkslab. The advisory is shared for download at blog.quarkslab.com. This vulnerability is handled as CVE-2026-27749 since 02/23/2026. The exploitation is known to be easy. The attack needs to be approached locally. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 03/08/2026).

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). Once again VulDB remains the best source 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: 7.8
VulDB Meta Temp Score: 7.6

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

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: Deserialization
CWE: CWE-502 / CWE-20
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
03/08/2026 +3 days VulDB entry last update

Sourcesinfo

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

CVE: CVE-2026-27749 (🔒)
GCVE (CVE): GCVE-0-2026-27749
GCVE (VulDB): GCVE-100-349196
CERT Bund: WID-SEC-2026-0618 - Avira Internet Security Suite: Mehrere Schwachstellen

Entryinfo

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

Once again VulDB remains the best source for vulnerability data.

Discussion

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