Vulnerability-Lookup

WID-SEC-W-2026-0618

Vulnerability from csaf_certbund - Published: 2026-03-05 23:00 - Updated: 2026-03-05 23:00

Summary

Avira Internet Security Suite: Mehrere Schwachstellen

Severity

Hoch

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung: Avira Internet Security Suite ist ein Antivirenprodukt zur Entdeckung und Verhinderung der Ausführung von Schadcode.

Angriff: Ein Angreifer kann mehrere Schwachstellen in Avira Internet Security Suite ausnutzen, um seine Privilegien zu erhöhen, um beliebigen Code mit Administratorrechten auszuführen, um Dateien zu manipulieren, und um einen Denial of Service Angriff durchzuführen.

Betroffene Betriebssysteme: - Windows

CVE-2026-27748

CVE-2026-27749

CVE-2026-27750

References

URL

CVE-2026-27750 (GCVE-0-2026-27750)

Vulnerability from cvelistv5 – Published: 2026-03-05 14:15 – Updated: 2026-04-01 14:38

Title

Avira Internet Security Optimizer TOCTOU

Summary

Avira Internet Security contains a time-of-check time-of-use (TOCTOU) vulnerability in the Optimizer component. A privileged service running as SYSTEM identifies directories for cleanup during a scan phase and subsequently deletes them during a separate cleanup phase without revalidating the target path. A local attacker can replace a previously scanned directory with a junction or reparse point before deletion occurs, causing the privileged process to delete an unintended system location. This may result in deletion of protected files or directories and can lead to local privilege escalation, denial of service, or system integrity compromise depending on the affected target.

Severity ?

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE

CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

Assigner

VulnCheck

References

URL

Tags

	https://support.avira.com/hc/en-us/articles/36001…	release-notes
	https://www.avira.com/en/internet-security	product
	https://www.gendigital.com/us/en/contact-us/secur…	vendor-advisory

Impacted products

	Vendor	Product	Version
	Gen Digital Inc.	Avira Internet Security	Affected: 0 , ≤ 1.1.109.1990 (semver) Unaffected: 1.1.114.3113 (semver)

Show details on NVD website

JSON

To clipboard

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CVE-2026-27749 (GCVE-0-2026-27749)

Vulnerability from cvelistv5 – Published: 2026-03-05 14:15 – Updated: 2026-04-01 14:38

Title

Avira Internet Security System Speedup Insecure Deserialization

Summary

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.

Severity ?

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE

CWE-502 - Deserialization of Untrusted Data

Assigner

VulnCheck

References

URL

Tags

	https://support.avira.com/hc/en-us/articles/36001…	release-notes
	https://www.avira.com/en/internet-security	product
	https://www.gendigital.com/us/en/contact-us/secur…	vendor-advisory

Impacted products

	Vendor	Product	Version
	Gen Digital Inc.	Avira Internet Security	Affected: 0 , ≤ 1.1.109.1990 (semver) Unaffected: 1.1.114.3113 (semver)

Show details on NVD website

JSON

To clipboard

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CVE-2026-27748 (GCVE-0-2026-27748)

Vulnerability from cvelistv5 – Published: 2026-03-05 14:15 – Updated: 2026-04-01 14:37

Title

Avira Internet Security Arbitrary File Deletion via Improper Link Resolution

Summary

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.

Severity ?

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE

CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Assigner

VulnCheck

References

URL

Tags

	https://support.avira.com/hc/en-us/articles/36001…	release-notes
	https://www.avira.com/en/internet-security	product
	https://www.gendigital.com/us/en/contact-us/secur…	vendor-advisory

Impacted products

	Vendor	Product	Version
	Gen Digital Inc.	Avira Internet Security	Affected: 0 , ≤ 1.1.109.1990 (semver) Unaffected: 1.1.114.3113 (semver)

Show details on NVD website

JSON

To clipboard

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    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-27748",
    "datePublished": "2026-03-05T14:15:48.976Z",
    "dateReserved": "2026-02-23T21:38:48.842Z",
    "dateUpdated": "2026-04-01T14:37:46.139Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Tags

Taxonomy of the tags.

All sightings related to this event Export sightings related to this event

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

WID-SEC-W-2026-0618

CVE-2026-27750 (GCVE-0-2026-27750)

CVE-2026-27749 (GCVE-0-2026-27749)

CVE-2026-27748 (GCVE-0-2026-27748)

Tags

Sightings

Nomenclature