CVE-2021-21798
An exploitable return of stack variable address vulnerability exists in the JavaScript implementation of Nitro Pro PDF.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 21.4%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
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
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 21.37% probability · 98th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-562
- Affected
- gonitro/nitro pro
- Source
- talos-cna@cisco.com
EPSS moved from 21.4% on 11 October 2026 to 21.4% on 26 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
References
- https://talosintelligence.com/vulnerability_reports/TALOS-2021-1267Exploit, Third Party Advisory
- https://talosintelligence.com/vulnerability_reports/TALOS-2021-1267Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.