{"id":"CVE-2026-27749","state":"PUBLISHED","title":"Avira Internet Security System Speedup Insecure Deserialization","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.","publishedAt":"2026-03-05T14:15:35.580Z","updatedAt":"2026-04-01T14:38:16.632Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"GEN"},"assigner":"VulnCheck","products":["Gen Digital Inc. Avira Internet Security"],"affected":[{"vendor":"Gen Digital Inc.","product":"Avira Internet Security","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"1.1.109.1990","versionType":"semver"},{"version":"1.1.114.3113","status":"unaffected","versionType":"semver"}],"platforms":["Windows"]}],"references":["https://support.avira.com/hc/en-us/articles/360010656158-Current-Avira-versions","https://www.avira.com/en/internet-security","https://www.gendigital.com/us/en/contact-us/security-advisories/"],"weaknesses":["CWE-502"],"ingestedAt":"2026-10-29T20:11:31.369Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/27xxx/CVE-2026-27749.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-27749","state":"PUBLISHED","datePublished":"2026-03-05T14:15:35.580Z","dateUpdated":"2026-04-01T14:38:16.632Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-02-23T21:38:48.842Z"},"containers":{"cna":{"title":"Avira Internet Security System Speedup Insecure Deserialization","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Gen Digital Inc.","product":"Avira Internet Security","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"1.1.109.1990","versionType":"semver"},{"version":"1.1.114.3113","status":"unaffected","versionType":"semver"}],"platforms":["Windows"]}],"references":[{"url":"https://support.avira.com/hc/en-us/articles/360010656158-Current-Avira-versions","tags":["release-notes"]},{"url":"https://www.avira.com/en/internet-security","tags":["product"]},{"url":"https://www.gendigital.com/us/en/contact-us/security-advisories/","tags":["vendor-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseSeverity":"HIGH","baseScore":7.8,"vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-502","lang":"en","description":"CWE-502 Deserialization of Untrusted Data","type":"CWE"}]}],"providerMetadata":{"shortName":"GEN","orgId":"dbd8429d-f261-4b1e-94cc-ae3132817e2e","dateUpdated":"2026-04-01T14:38:16.632Z"},"impacts":[{"descriptions":[{"lang":"en","value":"A local user can influence a privileged System Speedup process to deserialize untrusted data, potentially achieving privilege escalation to SYSTEM."}]},{"descriptions":[{"lang":"en","value":"Untrusted serialized input may lead to execution of arbitrary code in the security context of the privileged optimizer component."}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:avira:avira_internet_security_suite:*:*:*:*:*:windows:*:*","versionEndIncluding":"1.1.109.1990","vulnerable":true}],"negate":false,"operator":"OR"}]}],"solutions":[{"lang":"en","value":"Upgrade Avira Internet Security for Windows to version 1.1.114.3113 or later. Apply updates through the product's built-in updater or a fresh install from the vendor; see the release-notes reference in this record for current supported versions.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>Upgrade Avira Internet Security for Windows to version 1.1.114.3113 or later. Apply updates through the product's built-in updater or a fresh install from the vendor; see the release-notes reference in this record for current supported versions.</p>"}]}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-06T18:17:05.292085Z","id":"CVE-2026-27749","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-06T18:17:15.860Z"}}]}}}