Security readout for executives and security teams
Plain-English summary
This flaw can crash F-Secure's antivirus scanning engine when it processes larger packages or fuzzed files. The main business impact is temporary loss of antivirus scanning, not data theft. Source evidence rates it low severity and does not confirm active exploitation.
Executive priority
Handle through normal vulnerability management unless FSAVD protects critical Linux workloads. Prioritize inventory clarity and vendor-guided updates because the main risk is antivirus disruption rather than system compromise.
Technical view
CVE-2021-33572 is a CWE-476 null pointer issue in the FSAVD component used by F-Secure Linux Security and certain F-Secure products. The record says remote triggering is possible, with low privileges and user interaction in the CVSS vector. Successful exploitation causes denial of service of the antivirus engine.
Likely exposure
Exposure is most likely where F-Secure Linux Security or products using FSAVD scan large packages or malformed files. The source bundle does not provide exact product/version mapping beyond broad affected wording.
Exploitation context
The CVE is not listed as CISA KEV in the provided data. The sources state remote triggering is possible, but no cited source confirms active exploitation, public exploit availability, or weaponized campaigns.
Researcher notes
Evidence is limited. The CVE description identifies FSAVD crash behavior, larger packages or fuzzed files as triggers, CWE-476, CVSS 3.1 score 3.5, and broad F-Secure product impact. No patch details, proof-of-concept status, or detailed affected version list is included.
Mitigation direction
- Check F-Secure security advisories for product-specific fixed versions or mitigations.
- Update affected F-Secure Linux Security or FSAVD-based products per vendor guidance.
- Ask F-Secure support for exact exposure mapping if versions are unclear.
- Monitor antivirus engine health and alert on FSAVD crashes.
Validation and detection
- Inventory systems running F-Secure Linux Security or FSAVD-based products.
- Compare installed versions with current F-Secure advisory guidance.
- Review endpoint logs for FSAVD crashes during file scanning.
- Confirm antivirus engine service health after any vendor-recommended update.
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-476: 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-2021-33572 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
- Low
- CVSS
- 3.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/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:N/I:L/A:N2.11.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
3.5LowVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/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
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.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.