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PatchSiren cyber security CVE debrief

CVE-2025-9033 Gen Digital CVE debrief

A heap buffer out-of-bounds read vulnerability was discovered in the Avira Antivirus engine. This issue occurs when the engine scans a malformed PDF file, potentially allowing for Local Execution of Code or Denial-of-Service of the antivirus engine process. The vulnerability affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.70.76.

Vendor
Gen Digital
Product
Avira Antivirus
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-12
Original CVE updated
2026-06-15
Advisory published
2026-06-12
Advisory updated
2026-06-15

Who should care

Users of Avira Antivirus on Windows, macOS, and Linux with engine builds before 8.3.70.76 should be aware of this vulnerability.

Technical summary

The vulnerability has a CVSS score of 7.8 and is classified as HIGH severity. It is characterized by a heap buffer out-of-bounds read vulnerability in the Avira Antivirus engine when scanning a malformed PDF file.

Defensive priority

HIGH

Recommended defensive actions

  • Update Avira Antivirus engine to build 8.3.70.76 or later.

Evidence notes

The CVE record was published on June 12, 2026, and no modifications have been made since then.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-9033 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-9033

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2025-9033 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-9033

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.