# CVE-2021-21798

## Summary

- **CVE ID:** CVE-2021-21798
- **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-562
- **Published:** Sep 15, 2021
- **Last Modified:** Mar 13, 2026

## Description

An exploitable return of stack variable address vulnerability exists in the JavaScript implementation of Nitro Pro PDF. A specially crafted document can cause a stack variable to go out of scope, resulting in the application dereferencing a stale pointer. This can lead to code execution under the context of the application. An attacker can convince a user to open a document to trigger the 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-2021-1267)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 68.65%
- **EPSS Percentile:** 98.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._