CVE-2021-21797 in the critical feed json
An exploitable double-free vulnerability exists in the JavaScript implementation of Nitro Pro PDF.
published 2021-10-18 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-8969
- cvss
- 8.8
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 15.0%
- EPSS 15.0% chance of exploitation in 30 days, percentile 96%
- public exploits
- 0
- none known
Summary
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.
Exploit prediction
15.05% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- talosintelligence.com https://talosintelligence.com/vulnerability_reports/TALOS-2021-1266 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 8.8 | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
Affected products
- n/a Nitro Pro
Classification
- Weakness
-
- CWE-415 Double Free
References
-
talosintelligence.com
/vulnerability_reports/TALOS-2021-1266
exploit, mitigation, third-party-advisory
Sources
- CVE List CVE-2021-21797
- NVD CVE-2021-21797
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.