Security readout for executives and security teams
Plain-English summary
CVE-2021-33598 can crash the antivirus engine in affected F-Secure endpoint protection products when SAVAPI scans specially crafted fuzzed files. The stated impact is denial of service of antivirus scanning, not full system compromise. Business risk is reduced endpoint protection availability if vulnerable products are still deployed.
Executive priority
Treat as a moderate operational resilience issue. Prioritize remediation where F-Secure endpoint protection is relied on for malware scanning of untrusted files, especially email, downloads, and shared-file workflows.
Technical view
The issue affects the SAVAPI component used by F-Secure endpoint protection products on Windows, Mac, and Linux Security. Sources describe a remotely triggerable crash during scanning of fuzzed files. CVSS 3.1 is 4.6, with low attack complexity, low privileges, and user interaction required.
Likely exposure
Organizations using F-Secure endpoint protection products with the SAVAPI component may be exposed. The source bundle states all versions, but does not provide exact product build ranges or fixed versions.
Exploitation context
The bundle does not show CISA KEV listing or confirmed active exploitation. It says remote triggering is possible and successful exploitation causes antivirus engine denial of service while scanning crafted files.
Researcher notes
Evidence is limited to CVE metadata and F-Secure advisory references. The provided CVSS vector includes PR:L and UI:R, while the description says remote triggering is possible. Do not infer broader code execution or data compromise from these sources.
Mitigation direction
- Review F-Secure advisory FSC-2021-33598 for fixed versions and vendor guidance.
- Update affected F-Secure endpoint protection products according to vendor instructions.
- Monitor antivirus engine health and restart failures on endpoints.
- Reduce unnecessary handling of untrusted files where business processes allow.
Validation and detection
- Inventory F-Secure endpoint protection deployments across Windows, Mac, and Linux systems.
- Identify whether deployed products use the SAVAPI component.
- Compare installed versions against F-Secure advisory guidance.
- Review endpoint logs for antivirus engine crashes or scan failures.
- Confirm monitoring alerts when endpoint protection services stop unexpectedly.
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.
CVE-2021-33598 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
- Medium
- CVSS
- 4.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
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.
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:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N2.12.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.6MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fameCVE reference · x_refsource_MISC
- https://www.f-secure.com/en/business/support-and-downloads/security-advisoriesCVE reference · x_refsource_MISC
- https://www.f-secure.com/en/business/support-and-downloads/security-advisories/fsc-2021-33598CVE reference · x_refsource_MISC
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.