Security readout for executives and security teams
Plain-English summary
CVE-2021-40893 is an availability risk in validate-data v0.1.1. A specially crafted invalid email value can cause excessive regular-expression processing during validation, potentially slowing or tying up an application that processes untrusted email input.
Executive priority
Treat this as a targeted availability concern, not a confirmed breach indicator. Prioritize if public forms, signups, APIs, or bulk import paths use validate-data v0.1.1 for email validation.
Technical view
The CVE describes a Regular Expression Denial of Service condition in validate-data v0.1.1 email validation. The source bundle provides no CVSS score, CWE mapping, CPEs, affected downstream products, or fixed version.
Likely exposure
Exposure is most likely in applications that use validate-data v0.1.1 to validate attacker-controlled email addresses. The provided sources do not identify specific vendors, platforms, package ecosystems, or deployed products.
Exploitation context
The bundle does not show CISA KEV listing, active exploitation, public weaponization, or exploitation scale. It only states that crafted invalid emails can trigger the ReDoS condition.
Researcher notes
Evidence is sparse. The CVE description names validate-data v0.1.1 and invalid-email validation as the trigger area, but the bundle lacks scoring, patch data, CPEs, and independent exploit-status confirmation.
Mitigation direction
- Inventory applications and dependencies for validate-data v0.1.1.
- Check maintainer or package guidance for fixed versions or replacement recommendations.
- Avoid passing untrusted email input to affected validation logic where feasible.
- Apply request size limits and validation timeouts as compensating availability controls.
Validation and detection
- Search dependency manifests and lockfiles for validate-data v0.1.1.
- Confirm whether email validation paths accept unauthenticated or bulk-submitted input.
- Review logs for slow requests tied to email validation endpoints.
- Verify any remediation against vendor or maintainer guidance before deployment.
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
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CVE-2021-40893 mapping review
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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/yetingli/SaveResults/blob/main/js/validate-data.jsCVE 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.