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Vulnerability record · CVE-2021-21796 · published 18 October 2021

CVE-2021-21796: Gonitro nitro pro use after free vulnerability

Gonitro · Nitro Pro

An exploitable use-after-free vulnerability exists in the JavaScript implementation of Nitro Pro PDF. A specially crafted document can cause an object containing the path to a document to be destroyed and then later reused, resulting in a use-after-free vulnerability, which 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 16% · top 3.2% CWE-416 · Use after free
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 use-after-free vulnerability exists in the JavaScript implementation of Nitro Pro PDF. A specially crafted document can cause an object containing the path to a document to be destroyed and then later reused, resulting in a use-after-free vulnerability, which 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-2021-1265 ExploitMitigationThird Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1265 ExploitMitigationThird Party Advisory

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Related vulnerabilities

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

8.8CVE-2020-6146Nitro Pro heap buffer overflow in ICCBased colorspace stroke renderingNitro Pro 13.13.2.242 and 13.16.2.300 contain a heap-based buffer overflow when rendering a page and selecting the stroke color from an ICCBased colo…EPSS 76%analysed8.8CVE-2020-6074Gonitro nitro pro use after free vulnerabilityAn exploitable code execution vulnerability exists in the PDF parser of Nitro Pro 13.9.1.155. A specially crafted PDF document can cause a use-after-…EPSS 41%8.8CVE-2017-7442Gonitro nitro pro path traversal vulnerabilityNitro Pro 11.0.3.173 allows remote attackers to execute arbitrary code via saveAs and launchURL calls with directory traversal sequences.EPSS 41%8.1CVE-2020-10223Gonitro nitro pro out-of-bounds write vulnerabilitynpdf.dll in Nitro Pro before 13.13.2.242 is vulnerable to JBIG2Decode CNxJBIG2DecodeStream Heap Corruption at npdf!CAPPDAnnotHandlerUtils::create_pop…EPSS 2.5%8.1CVE-2020-10222Gonitro nitro pro vulnerabilitynpdf.dll in Nitro Pro before 13.13.2.242 is vulnerable to Heap Corruption at npdf!nitro::get_property+2381 via a crafted PDF document.EPSS 2.5%7.8CVE-2021-21797Gonitro nitro pro double free vulnerabilityAn exploitable double-free vulnerability exists in the JavaScript implementation of Nitro Pro PDF. A specially crafted document can cause a reference…EPSS 15%7.8CVE-2021-21798Gonitro nitro pro vulnerabilityAn exploitable return of stack variable address vulnerability exists in the JavaScript implementation of Nitro Pro PDF. A specially crafted document …EPSS 16%7.8CVE-2020-6113Nitro Pro PDF object stream integer overflow leads to code executionNitro Pro 13.13.2.242 mishandles size calculation when updating its cross-reference table while parsing an object stream in a PDF. An integer overflo…EPSS 65%analysed

Source: NIST National Vulnerability Database (record CVE-2021-21796), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.