Security readout for executives and security teams
Plain-English summary
CVE-2020-21574 describes a buffer overflow in YotsuyaNight c-http v0.1.0. A long URL request can be passed into a vulnerable read function and crash the service, causing denial of service. The public record does not provide a CVSS score, patch status, or evidence of active exploitation.
Executive priority
Treat this as a targeted availability risk. Prioritize it if c-http v0.1.0 is internet-facing or supports business-critical services; otherwise handle through normal dependency hygiene and replacement planning.
Technical view
The issue is reported as a buffer overflow in c-http v0.1.0 involving long URL input reaching the delimitedread function. The stated impact is denial of service. Public metadata lists limited affected-product detail and only one referenced GitHub issue, so exposure and remediation specifics require local verification.
Likely exposure
Exposure is likely limited to systems that directly embed or run YotsuyaNight c-http v0.1.0, especially if reachable by untrusted HTTP clients. The CVE record does not identify broader downstream products, packages, or CPEs.
Exploitation context
The source bundle does not show CISA KEV listing, confirmed active exploitation, public exploit tooling, or a vendor advisory. The described trigger is malformed input causing service denial, not confirmed remote code execution.
Researcher notes
Evidence is sparse: no CVSS vector, CWE mapping, CPE, or documented fix is included. Validate the GitHub issue details and repository history before assigning severity or declaring a patch path.
Mitigation direction
- Check the upstream issue and repository for maintainer guidance or replacement releases.
- Remove or isolate c-http v0.1.0 from internet-facing paths where possible.
- Place untrusted traffic behind existing request-size controls as a compensating measure, not a confirmed vendor fix.
- Monitor service crashes associated with unusually long URL requests.
Validation and detection
- Search SBOMs and source trees for YotsuyaNight c-http v0.1.0 usage.
- Confirm whether any deployed service using c-http accepts untrusted HTTP requests.
- Review crash logs for failures correlated with oversized URL requests.
- Use controlled non-production testing to verify long-request handling without publishing payload details.
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-2020-21574 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/YotsuyaNight/c-http/issues/1CVE 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.