PatchTheCVECVE-2021-39535: An issue was discovered in libxsmm through v1.16.1-93
CVE-2021-39535 is a medium-severity flaw (CVSS 6.5) affecting libxsmm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An issue was discovered in libxsmm through v1.16.1-93. A NULL pointer dereference exists in JIT code. It allows an attacker to cause Denial of Service.
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.5 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.9% (top 42%) |
| CISA exploited list | No |
| Weakness | CWE-476 |
| Published | 2021-09-20 |
| 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-2021-39535?
libxsmm: upgrade to newer than 1.16.1. Exact commands for each OS are on this page.
Is CVE-2021-39535 being exploited?
CVE-2021-39535 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-2021-39535 affect?
CVE-2021-39535 affects libxsmm. Severity is medium (CVSS 6.5). An issue was discovered in libxsmm through v1.16.1-93. A NULL pointer dereference exists in JIT code. It allows an attacker to cause Denial of Service.
How urgent is CVE-2021-39535?
Priority 42/100. Public exploit reference
Related CVEs
- CVE-2021-39536 HIGH 8.8 UPGRADE An issue was discovered in libxsmm through v1.16.1-93