Security readout for executives and security teams
Plain-English summary
Macaron Notes Gear Notebook 5.5 can be crashed by extremely large note content. The known impact is denial of service: the application stops working, not data theft or code execution based on provided sources.
Executive priority
Treat as a high-priority availability risk where Macaron Notes supports business workflows. Urgency drops if the product is absent or not operationally important.
Technical view
CVE-2021-47970 is reported as a buffer-overflow denial-of-service issue in Macaron Notes 5.5, mapped to CWE-789. The CVSS 4.0 score is 8.7 with high availability impact and no reported confidentiality or integrity impact.
Likely exposure
Confirmed exposure is limited to Macaron Notes Gear Notebook version 5.5. The bundle does not establish whether other versions, platforms, or deployments are affected.
Exploitation context
A public ExploitDB reference exists, but the CVE is not listed as KEV in the bundle. No cited source states active exploitation in the wild.
Researcher notes
Evidence supports denial of service only. The source bundle references exploit material but does not prove active exploitation, patch availability, or broader product impact. Avoid assuming code execution without stronger evidence.
Mitigation direction
- Inventory systems using Macaron Notes Gear Notebook 5.5.
- Check vendor guidance for a fixed release or official workaround.
- Limit untrusted note creation, import, or synchronization until remediated.
- Monitor for repeated application crashes or availability loss.
- Prioritize replacement if no supported fix is available.
Validation and detection
- Confirm installed product name and version against Macaron Notes Gear Notebook 5.5.
- Review crash logs for failures after oversized note content handling.
- Check whether untrusted users can create or submit notes.
- Verify any vendor update or workaround in a controlled environment.
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-789: 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-2021-47970 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
- 8.7 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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.
SSVC decision data
CVSS vector scores
2 official scoresWe 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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N——VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6VulnCheckVulnerability scoring details
Base CVSS 4.0 score
8.7HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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
- ExploitDB-49953CVE reference, VulnCheck · exploit
- VulnCheck Advisory: Macaron Notes 5.5 Denial of Service via Buffer OverflowCVE reference, VulnCheck · third-party-advisory
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.
Memory Allocation with Excessive Size Value
Memory Allocation with Excessive Size Value represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.