PatchTheCVECVE-2021-38563: An issue was discovered in Foxit PDF Reader before 11.0.1 and PDF Editor before 11.0.1
CVE-2021-38563 is a critical-severity flaw (CVSS 9.8) affecting pdf reader, pdf editor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An issue was discovered in Foxit PDF Reader before 11.0.1 and PDF Editor before 11.0.1. It mishandles situations in which an array size (derived from a /Size entry) is smaller than the maximum indirect object number, and thus there is an attempted incorrect array access (leading to a NULL pointer dereference, or out-of-bounds read or write).
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.1% (top 35%) |
| CISA exploited list | No |
| Weakness | CWE-129 |
| Published | 2021-08-11 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-38563?
pdf reader: upgrade to newer than 11.0.0.0510; pdf editor: upgrade to newer than 11.0.0.0510. Exact commands for each OS are on this page.
Is CVE-2021-38563 being exploited?
CVE-2021-38563 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-38563 affect?
CVE-2021-38563 affects pdf reader, pdf editor. Severity is critical (CVSS 9.8). An issue was discovered in Foxit PDF Reader before 11.0.1 and PDF Editor before 11.0.1. It mishandles situations in which an array size (derived from a /Size entry) is smaller than the maximum indirect object number, and thus there is an at
How urgent is CVE-2021-38563?
Priority 56/100. Critical severity; Remotely exploitable, no login, no user action
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