Security readout for executives and security teams
Plain-English summary
CVE-2021-33983 is a local buffer overflow reported in Dvidelabs flatcc v0.6.0. A user with local access could potentially make the affected execution path run arbitrary code, with high confidentiality, integrity, and availability impact. The provided sources do not identify active exploitation or a confirmed fixed version.
Executive priority
Treat as a high-priority local exposure issue for developer and build environments, not as confirmed internet-facing exploitation. Prioritize inventory and vendor-status confirmation before broad emergency response.
Technical view
The CVE describes CWE-120 in flatcc v0.6.0 involving the error_ref_sym function during tool execution. CVSS 3.1 is 7.8: local attack vector, low complexity, low privileges required, no user interaction, unchanged scope, and high CIA impact. Product metadata is incomplete in the CVE bundle.
Likely exposure
Exposure is most likely where flatcc v0.6.0 is installed or invoked locally, especially developer workstations, build hosts, CI runners, or packaging environments. The CVE bundle provides no CPEs or broader affected product list.
Exploitation context
The source bundle does not show CISA KEV listing or other evidence of active exploitation. The scored scenario requires local access and low privileges; remote unauthenticated exploitation is not supported by the provided evidence.
Researcher notes
Evidence is limited: affected vendor/product fields are n/a, no CPEs are supplied, and only one GitHub issue is referenced. Avoid assuming affected forks, fixed releases, exploit maturity, or remote reachability without additional vendor evidence.
Mitigation direction
- Inventory systems and pipelines for flatcc v0.6.0 usage.
- Check the upstream flatcc issue and CVE record for maintainer remediation guidance.
- Restrict local access to build hosts running affected flatcc tooling.
- Run build and parsing tools with least privilege and isolated workspaces.
- Replace or update flatcc only after confirming a fixed upstream version.
Validation and detection
- Review dependency manifests, toolchains, containers, and CI images for flatcc v0.6.0.
- Confirm whether flatcc is executable by untrusted local users.
- Map systems where flatcc processes untrusted or externally supplied inputs.
- Check vendor and GitHub issue status for fix or workaround updates.
- Document compensating controls where no vendor fix is confirmed.
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-120: 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-33983 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:L/UI:N/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.
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:L/UI:N/S:U/C:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/dvidelabs/flatcc/issues/188CVE reference
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.
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.