CVE-2021-21797

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 15.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-10-18 · updated 2026-06-17
Weakness: CWE-415

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

Nitro Pro: 13.31.0.605, 13.33.2.645

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1266
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1266

Get alerted when CVE-2021-21797 or the next vulnerability affects your stack