CVE-2021-21798 in the critical feed json
An exploitable return of stack variable address vulnerability exists in the JavaScript implementation of Nitro Pro PDF.
published 2021-09-15 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-8970
- cvss
- 8.8
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 21.4%
- EPSS 21.4% chance of exploitation in 30 days, percentile 97%
- public exploits
- 0
- none known
Summary
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.
Exploit prediction
21.37% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- talosintelligence.com https://talosintelligence.com/vulnerability_reports/TALOS-2021-1267 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-562 Return of Stack Variable Address
References
-
talosintelligence.com
/vulnerability_reports/TALOS-2021-1267
exploit, third-party-advisory
Sources
- CVE List CVE-2021-21798
- NVD CVE-2021-21798
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.