# CVE-2021-21797

## Summary

- **CVE ID:** CVE-2021-21797
- **Severity:** HIGH
- **CVSS Score:** 8.8 (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
- **CWE:** CWE-415
- **Published:** Oct 18, 2021
- **Last Modified:** Mar 13, 2026

## Description

An exploitable double-free vulnerability exists in the JavaScript implementation of Nitro Pro PDF. A specially crafted document can cause a reference to a timeout object to be stored in two different places. When closed, the document will result in the reference being released twice. This can lead to code execution under the context of the application. An attacker can convince a user to open a document to trigger this vulnerability.

## Affected Products

- n/a — Nitro Pro (Nitro Pro 13.31.0.605 ,Nitro Pro 13.33.2.645)

## References

- [CNA](https://talosintelligence.com/vulnerability_reports/TALOS-2021-1266)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 73.37%
- **EPSS Percentile:** 98.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._