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Vulnerability record · CVE-2021-21797 · published 18 October 2021

CVE-2021-21797: Gonitro nitro pro double free vulnerability

Gonitro · Nitro Pro

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.

7.8 CVSS 3.1 High EPSS 15% · top 3.4% CWE-415 · Double free
7.8CVSS 3.1 base score, v2 6.8
15%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1266 ExploitMitigationThird Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1266 ExploitMitigationThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-21797), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.