Security readout for executives and security teams
Plain-English summary
CVE-2019-13617 is a memory-read flaw in njs, the scripting engine used with NGINX. The public record says versions through 0.3.3 can read past a heap buffer during error handling. Business urgency depends on whether your NGINX estate uses njs and whether it processes untrusted script input or configurations.
Executive priority
Treat this as an inventory-driven issue. It is not currently KEV-listed and lacks severity scoring, but outdated njs in production NGINX should be reviewed because memory-safety flaws can create reliability or security risk.
Technical view
The issue is a heap-based buffer over-read in `nxt_vsprintf` within `nxt/nxt_sprintf.c`. The described path occurs during parser error handling, involving regexp literal parsing and lexer/scope error reporting. The bundle does not provide CVSS, CWE, confirmed impact details, or a named fixed version.
Likely exposure
Exposure is most likely where NGINX uses njs through 0.3.3. Standard NGINX deployments without njs are not shown as affected by the provided sources. The affected-product metadata is incomplete, so inventory confirmation is required.
Exploitation context
The bundle cites GitHub and OSS-Fuzz references and marks CISA KEV as false. There is no source-provided evidence of active exploitation, public weaponization, or real-world compromise. The example appears parser/error-handling related, not a documented remote attack chain.
Researcher notes
The public record is sparse: affected metadata is generic, CVSS is absent, and no fix is named in the bundle. Analysis should stay bounded to njs through 0.3.3 and the documented heap over-read in error handling.
Mitigation direction
- Inventory all NGINX deployments using njs.
- Identify any njs versions at or below 0.3.3.
- Check NGINX/njs vendor guidance for fixed versions or mitigations.
- Prioritize updates where njs handles untrusted inputs or dynamic scripts.
- Reduce unnecessary njs exposure until vendor remediation is confirmed.
Validation and detection
- Confirm whether the njs module is installed or loaded.
- Record exact njs package or build versions.
- Review NGINX configs for njs usage and script entry points.
- Check crash logs for njs parser or error-handling failures.
- Compare findings against the CVE and linked upstream references.
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-2019-13617 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/nginx/njs/issues/174CVE reference · x_refsource_MISC
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=15093CVE 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.