Security readout for executives and security teams
Plain-English summary
Avira’s antivirus engine can mishandle a malformed PDF during scanning. A user would need to encounter a malicious PDF so the engine scans it. On vulnerable engine builds, this could crash the antivirus process or potentially allow code execution. The issue affects Avira Antivirus on Windows, macOS, and Linux before engine build 8.3.70.76.
Executive priority
Treat this as a high-priority endpoint security update. It targets the antivirus scanning layer, so a crash or code execution path could weaken protective controls on user devices. Prioritize rapid inventory and engine updates, especially for users exposed to external PDFs.
Technical view
CVE-2025-9033 is a CWE-125 heap out-of-bounds read in the Avira Antivirus engine PDF scanning path. CVSS 3.1 is 7.8 with local attack vector, low complexity, no privileges required, and user interaction required. The CVE states possible local code execution or denial of service for engine builds earlier than 8.3.70.76.
Likely exposure
Exposure is limited to systems running Avira Antivirus on Windows, macOS, or Linux with engine builds before 8.3.70.76. Risk is most relevant where users receive or download PDFs and endpoint antivirus scanning processes those files.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not marked as CISA KEV. Exploitation would require a malformed PDF to be scanned locally, with user interaction indicated by the CVSS vector. Public exploit maturity is not established in the source bundle.
Researcher notes
The source bundle provides the affected engine threshold, CVSS vector, CWE-125 classification, and broad OS coverage. It does not include root-cause detail, proof-of-concept status, exploit telemetry, or detailed vendor remediation steps beyond builds before 8.3.70.76 being affected.
Mitigation direction
- Update Avira Antivirus engine to build 8.3.70.76 or later where available.
- Review Gen Digital security advisories for vendor-specific upgrade instructions.
- Prioritize endpoints that process untrusted PDFs or email attachments.
- Monitor antivirus engine stability until updates are confirmed.
- Use standard email and web controls to reduce malicious PDF delivery.
Validation and detection
- Inventory Avira Antivirus deployments across Windows, macOS, and Linux endpoints.
- Confirm each endpoint’s antivirus engine build is 8.3.70.76 or later.
- Check endpoint management logs for antivirus engine crashes during PDF scanning.
- Verify vendor advisory status before marking remediation complete.
- Confirm no unsupported or unmanaged Avira installations remain.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-125: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2025-9033 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9GENVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://www.gendigital.com/us/en/contact-us/security-advisories/CVE reference, GEN
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.