Security readout for executives and security teams
Plain-English summary
CVE-2021-40896 describes a denial-of-service risk in that-value v0.1.3 during email validation. If an exposed application validates attacker-controlled email input with this version, malformed input may consume excessive processing time and degrade availability. The public record does not provide CVSS, CPEs, or a named fixed version.
Executive priority
Prioritize if public signup, contact, invite, or account-recovery flows use this package version. Otherwise treat it as dependency cleanup with uncertain urgency because public severity, exploit status, and vendor fix data are incomplete.
Technical view
The CVE records a Regular Expression Denial of Service issue in that-value v0.1.3 when validating crafted invalid emails. The affected metadata is sparse and lists no formal vendor, product, CPE, CWE, patch, or mitigation. Analysis should focus on dependency presence and untrusted email-validation paths.
Likely exposure
Likely exposure is limited to applications that include that-value v0.1.3 and pass untrusted email strings into its validation logic. The source bundle does not establish broader affected versions, transitive package reach, or hosted-service exposure.
Exploitation context
The bundle does not show active exploitation, and KEV status is false. The described impact is availability loss through ReDOS, not data theft or code execution. Practical risk depends on whether vulnerable validation is reachable from high-volume public inputs.
Researcher notes
The evidence is sparse: CVE description names that-value v0.1.3, but affected metadata is n/a and CVSS/CWE are absent. Avoid expanding scope beyond that version without independent package evidence. No exploit details or fixed version are provided in the source bundle.
Mitigation direction
- Inventory applications and lockfiles for that-value v0.1.3.
- Check project or vendor guidance for a fixed release or replacement.
- Reduce exposure of public email-validation endpoints where practical.
- Add request timeouts, rate limits, and input length limits around email validation.
- Replace vulnerable validation logic if no maintained fixed version is available.
Validation and detection
- Confirm whether that-value v0.1.3 appears in direct or transitive dependencies.
- Map all code paths using its email validation against untrusted input.
- Review logs for unusual spikes on email-validation routes.
- Run non-destructive performance tests in a controlled environment only.
- Verify any replacement or upgrade with unit and regression tests.
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-2021-40896 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/yetingli/SaveResults/blob/main/js/that-value.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.