Security readout for executives and security teams
Plain-English summary
Fastify versions before 0.38.0 could be forced into a denial-of-service condition when handling a JSON request with a very large payload. For executives, the main risk is service instability or outage in applications built on affected Fastify versions, not data theft based on the provided sources.
Executive priority
Prioritize remediation for internet-facing Fastify services, especially public APIs. Business urgency is availability-focused: an affected service could be disrupted by oversized input. The absence of CVSS and active exploitation evidence lowers confidence, but exposure is straightforward to check.
Technical view
CVE-2018-3711 is a CWE-770 resource allocation issue in the Fastify Node.js module before 0.38.0. The described trigger is a request marked as application/json with a very large body. The source bundle provides no CVSS score and no evidence of confirmed active exploitation.
Likely exposure
Exposure is most likely where applications depend on Fastify before 0.38.0 and accept JSON request bodies from untrusted users. Public APIs, webhooks, and unauthenticated endpoints should be prioritized. Evidence does not identify specific downstream products or deployments.
Exploitation context
The public description indicates denial of service through oversized JSON input. CISA KEV status is false in the bundle, and no cited source in the bundle claims active exploitation. Treat exploit status as unconfirmed, not actively exploited.
Researcher notes
The bundle attributes affected versions as Fastify before 0.38.0 and cites CWE-770. Public evidence supplied here is concise, so avoid assuming broader parser behavior, exploit maturity, or affected frameworks beyond the Fastify module stated in the record.
Mitigation direction
- Upgrade Fastify to version 0.38.0 or later where feasible.
- Check vendor and project guidance for supported upgrade paths.
- Apply request body size limits for JSON endpoints.
- Prioritize public or unauthenticated JSON APIs first.
- Monitor affected services for resource exhaustion or availability anomalies.
Validation and detection
- Inventory package manifests and lockfiles for Fastify versions before 0.38.0.
- Identify routes accepting application/json from untrusted clients.
- Confirm JSON body size limits are configured and enforced.
- Review production telemetry for memory, CPU, or request-size spikes.
- Validate remediation in staging using approved availability testing only.
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-770: 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 lookupCVE-2018-3711 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/fastify/fastify/pull/627CVE reference · x_refsource_MISC
- https://hackerone.com/reports/303632CVE 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.