CVE-2021-21798: Gonitro Nitro Pro

High severity, CVSS 7.8. EPSS: 21.4% chance of exploitation in the next 30 days.

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

• Gonitro Nitro Pro: version 13.31.0.605 only; version 13.33.2.645 only

Published 2021-09-15. Last modified 2026-06-17.