Security readout for executives and security teams
Plain-English summary
This CVE describes a crash condition in libexcel 0.01 when a very long worksheet name is handled. The known impact is denial of service, not data theft or code execution. The record is sparse and explicitly notes this is not a Microsoft product.
Executive priority
Handle during normal vulnerability hygiene unless libexcel 0.01 is used in an internet-facing or business-critical document workflow. The main business risk is service interruption, and the available evidence does not show active exploitation.
Technical view
The flaw is in wbook_addworksheet in workbook.c within libexcel.a for libexcel 0.01. A long worksheet name can trigger a segmentation fault. The source bundle provides no CVSS score, CWE mapping, confirmed patch, or complete affected-product metadata.
Likely exposure
Exposure is limited to systems that use libexcel 0.01 and pass attacker-controlled or untrusted worksheet names to wbook_addworksheet. The CVE affected-product metadata is incomplete, so verify through dependency and source inventory rather than CPE matching.
Exploitation context
The public record describes a denial-of-service crash via long worksheet names. KEV is false, and the bundle provides no evidence of active exploitation. Do not assume remote exposure unless an application exposes worksheet creation to untrusted input.
Researcher notes
The CVE record is unusually thin: no CVSS, CWE, CPE, or patch details are provided. Analysis should focus on code reachability, input trust boundaries, and whether any maintained fork or project issue documents a remediation.
Mitigation direction
- Check vendor or project guidance for any fixed libexcel release.
- Replace or remove libexcel 0.01 where feasible.
- Validate worksheet-name length before calling libexcel routines.
- Avoid passing untrusted worksheet names into affected code paths.
- Add crash handling around document generation workflows.
Validation and detection
- Search dependency manifests and build artifacts for libexcel 0.01.
- Review source calls to wbook_addworksheet.
- Confirm whether worksheet names can come from users or external files.
- Check crash logs for segmentation faults in libexcel paths.
- Verify input-length validation covers worksheet names.
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-2018-20213 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/devinsmith/libexcel/issues/8CVE 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.