CVE-2021-21798

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 21.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-09-15 · updated 2026-06-17
Weakness: CWE-562

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.

Affected products

Nitro Pro: 13.31.0.605, 13.33.2.645

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1267
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1267

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