Vens vs. alternatives¶

Who this is for: anyone evaluating Vens against the wider VEX and vulnerability-management ecosystem, and wondering where Vens fits. By the end of this page: you know what Vens does differently, what it does not replace, and which tools it chains with.

This page is deliberately honest about overlap. Vens is not trying to replace the whole ecosystem — it solves one specific pain point.

The pain point Vens solves¶

Given a Trivy or Grype report with 200–500 CVEs, rank them by real risk to your specific system. That's it. Every other capability on this page is adjacent, upstream, or downstream of that one job.

Scanners (upstream of Vens)¶

Trivy, Grype, Syft, commercial scanners — these detect CVEs in a container image, filesystem, or SBOM. They produce the input Vens consumes.

Vens is not a scanner. It has no CVE database, no package detection, no SBOM generation. You always need a scanner in front of it.

Static / hand-written VEX tooling¶

vexctl — writes OpenVEX documents by hand. You assert CVE-X is not_affected with a justification you authored yourself. vexctl validates the document and signs it.

Use vexctl when: you have a small, known set of CVEs and a human security engineer ready to assert status per CVE. The decisions are authored by people and auditable by name.
Use Vens when: you have hundreds of CVEs per scan, no one has time to write one VEX entry per finding, and "prioritize by contextual risk" is a better outcome than "assert binary not_affected/affected".

The two are not mutually exclusive: you can use Vens to rank, triage the top N, and then hand-write vexctl assertions for the handful you decide to formally suppress.

LLM-based triage tooling¶

vexllm — predecessor and direct inspiration for Vens. vexllm uses an LLM to mark CVEs as not_affected in OpenVEX format.

vexllm outputs a binary affected / not_affected per CVE — yes/no suppression.
Vens outputs a continuous OWASP Risk Rating score (0–81) per CVE, with the four OWASP factors, and maps it to the CycloneDX VEX severity bucket.

They answer different questions. vexllm answers "should I hide this CVE?"; Vens answers "how urgent is it compared to the others?". If you only need to suppress noise in a dashboard, vexllm may be enough. If you need a prioritized patch queue and CI gating by contextual risk, Vens is closer to the goal.

Vens' prompt structure and output-handler pattern are adapted from vexllm — credit is in the code comments.

Vulnerability management platforms¶

Dependency-Track — an SBOM/vulnerability platform. It ingests SBOMs, tracks CVEs over time, can ingest VEX documents (including the CycloneDX VEX files Vens produces), and provides dashboards and policy.

Dependency-Track is downstream of Vens, not a replacement. Push the VEX generated by vens generate into Dependency-Track to get persistent history and dashboards on top of Vens' contextual scores.

OpenCVE, DefectDojo, Faraday, commercial ASPM platforms — similar story. They organize findings over time; Vens scores them contextually in a single run. These products do not replace each other.

Scanner-native `--vex` support¶

Trivy and Grype both accept --vex <file> on the command line. They use it to apply not_affected states from an OpenVEX document onto the scanner output.

This is complementary to Vens, not an alternative. Vens emits a CycloneDX VEX with OWASP ratings; Trivy and Grype can ingest it with --vex to annotate their own output with the contextual ratings. See Prioritize a CVE backlog → Step 5.

Deep reachability analysis¶

Semgrep, Snyk Reachability, Endor Labs, Socket, and similar products determine whether vulnerable code paths are actually reached at runtime. That is a much stronger signal than what Vens offers — they inspect your source code; Vens reasons from CVE metadata and your text-described context.

Use reachability tools when: you can afford them, you can run them on your codebase, and you need authoritative answers about whether a CVE is exploitable in this build.
Use Vens when: reachability analysis is out of reach (budget, closed source, polyglot stack, or early evaluation) and you still want a context-aware prioritization better than raw CVSS.

Vens scores will improve if you paste the conclusions of a reachability scan into config.yaml notes — the LLM uses them as ground truth.

So where does Vens sit?¶

     ┌──── Reachability analysis (Semgrep, Snyk, …)
     │     "Is this code actually executed?"
     │
     │     ┌── Vens
Scanner ───┤   "How much does this CVE actually cost me given my context?"
(Trivy,    │
Grype,     │     ┌── vexllm
…)         │     │  "Should I hide this CVE?"
     │     │     └── vexctl
     │     │         "Assert status per CVE, by a human, signed"
     │     │
     │     └── Dependency-Track, OpenCVE, DefectDojo, …
     │         "Track CVEs over time, run policy, aggregate reports"
     │
     └── CVSS, EPSS
         "What's the generic severity / exploit probability?"

Vens is the arrow that turns one scanner run into a ranked, contextual priority list — nothing more, nothing less.