microsoft / microsoft/security-devops-azdevops

Which Defender CLI binary should be used in CI/CD pipelines — `aka.ms` or the DevOps CDN endpoint?

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Descripción

We're integrating Defender for Cloud image scanning into our Azure DevOps pipelines. Rather than using the MicrosoftDefenderCLI@2 task (which emits ##[error] for any findings regardless of the break setting), we're invoking the CLI binary directly so we can control exit code handling and surface findings as warnings.

We've discovered there are two different CLI binaries available:

Official (aka.ms) DevOps CDN
URL https://aka.ms/defender-cli_linux-x64 https://cli.dfd.security.azure.com/public/v2/latest/Defender_linux-x64
Size ~126 MB ~24 MB
Version v2.0.3334.114 (as of May 2026) Unknown — no --version output tested
Break flag --defender-break (critical only) --fail-on <severity> (configurable threshold)
Documented Yes — Install, Syntax, CI/CD No
Auth Token-based (client ID/secret) or connector Auto-detects SYSTEM_ACCESSTOKEN
SHA-256 79F4F1EDC1DD2F99193BFFC47464023A450CFEFA03F362D7716A5E51D357B0C1 CD31528812D19142DC58DEEA0475E2610F5CC4E4D036F78EAB2FF1243CC5BB3A
Observations
  1. The CDN binary appears purpose-built for CI/CD use. It's significantly smaller (24 MB vs 126 MB), supports a configurable severity threshold (--fail-on low|medium|high|critical), and auto-detects Azure DevOps pipeline authentication via SYSTEM_ACCESSTOKEN. The URL pattern (cli.dfd.security.azure.com/public/v2/latest/) suggests it's the same binary the MicrosoftDefenderCLI@2 task downloads internally.

  2. The aka.ms CLI is the documented standalone CLI. It's referenced in the official CI/CD integration guide for non-ADO platforms (GitHub Actions, Jenkins, etc.). Its --defender-break flag only exits non-zero for "critical issues" with no configurable threshold.

  3. The --help outputs are completely different. The CDN binary exposes flags like --fail-on, --baseline, --severity, --suppress, --quiet, and --timeout that don't exist in the aka.ms binary, and vice versa (e.g. --defender-debug, --defender-output only in aka.ms).

  4. Neither binary's scan image flags match the documented CLI reference exactly. The docs list --defender-break and --defender-output as global options, which align with the aka.ms binary but not the CDN one.

Questions
  1. Is the CDN endpoint (cli.dfd.security.azure.com) a supported, stable distribution channel? Can we rely on it in production pipelines, or is it an internal implementation detail of the ADO task that could change without notice?

  2. Are these intended to be two separate products, or are they converging? The feature sets (especially --fail-on vs --defender-break) suggest they may be independently developed.

  3. For Azure DevOps pipelines where we need to bypass the task wrapper (to avoid ##[error] on non-critical findings), which binary is recommended?

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Línea de trabajo

Comienza con la tarea MicrosoftDefenderCLI@2 y la documentación enlazada sobre la instalación, la sintaxis y CI/CD de Defender CLI; después, compara el binario documentado de aka.ms con el endpoint cli.dfd.security.azure.com. Se considera terminado cuando se haya establecido si la CDN es compatible y estable, si los binarios son productos independientes y cuál de ellos deberían usar las canalizaciones de Azure DevOps.

Escrito por el modelo de indexación a partir del texto del issue.

Evaluación

Stack tecnológico
azure
Área
ci-cd, devops
Tipo de issue
Documentación
Dificultad
5/5
Tiempo estimado
Más de una semana
Estado de actividad
Tranquilo
Claridad
Necesita aclaración
Aptitud para principiantes
35/100

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