CVE-2021-21798
HIGHEPSS 97th pctlDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Exploit Intelligence
Very high risk: more likely to be exploited than 97% of all known CVEs.
References
Related Vulnerabilities
Other CWE-562 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2022-41837 | Critical | 9.8 | 1.6% | - | Fix |
| CVE-2024-4418 | Medium | 6.2 | 0.5% | - | Fix |
| CVE-2020-21686 | Medium | 5.5 | 0.4% | - | Fix |
| CVE-2026-3591 | Medium | 5.4 | 0.4% | - | Fix |
| CVE-2026-26399 | Medium | 5.3 | 0.2% | - | - |
| CVE-2026-34553 | Medium | 4.0 | 0.2% | - | Fix |
Common questions
How do I fix CVE-2021-21798?
No published fix for CVE-2021-21798 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2021-21798 being actively exploited?
Not that we know of. CVE-2021-21798 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 16.0% is the estimated probability that it will be exploited in the next 30 days. That is higher than 97% of all scored CVEs.
How severe is CVE-2021-21798?
CVE-2021-21798 has a CVSS v3 base score of 7.8, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.