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Vulnerability record · CVE-2021-21798 · published 15 September 2021

CVE-2021-21798: Gonitro nitro pro vulnerability

Gonitro · Nitro Pro

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.

7.8 CVSS 3.1 High EPSS 16% · top 3.2% CWE-562 · CWE-562
7.8CVSS 3.1 base score, v2 6.8
16%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 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.

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-2021-1267 ExploitThird Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1267 ExploitThird 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-2021-21798), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.