CVE-2021-36977
MEDIUMCVSS 6.5/10EPSS 1.50%
Last modified
CVE-2021-36977 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. matio (aka MAT File I/O Library) 1.5.20 and 1.5.21 has a heap-based buffer overflow in H5MM_memcpy (called from H5MM_malloc and H5C_load_entry), related to use of HDF5 1.12.0.. EPSS estimates a 1.50% chance of exploitation in the next 30 days.
Description
matio (aka MAT File I/O Library) 1.5.20 and 1.5.21 has a heap-based buffer overflow in H5MM_memcpy (called from H5MM_malloc and H5C_load_entry), related to use of HDF5 1.12.0.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Matio Project | Matio | 1.5.20 |
| Matio Project | Matio | 1.5.21 |
References
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31265Patch, Third Party Advisory
- https://github.com/HDFGroup/hdf5/issues/272Issue Tracking, Third Party Advisory
- https://github.com/google/oss-fuzz-vulns/blob/main/vulns/matio/OSV-2021-440.yamlThird Party Advisory
- https://github.com/google/oss-fuzz-vulns/commit/37b781ace1b4228fc36483bb7e30c72ea9d4c3d6Issue Tracking, Patch, Third Party Advisory
- https://github.com/google/oss-fuzz/issues/4999Issue Tracking, Third Party Advisory
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31265Patch, Third Party Advisory
- https://github.com/HDFGroup/hdf5/issues/272Issue Tracking, Third Party Advisory
- https://github.com/google/oss-fuzz-vulns/blob/main/vulns/matio/OSV-2021-440.yamlThird Party Advisory
- https://github.com/google/oss-fuzz-vulns/commit/37b781ace1b4228fc36483bb7e30c72ea9d4c3d6Issue Tracking, Patch, Third Party Advisory
- https://github.com/google/oss-fuzz/issues/4999Issue Tracking, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-36977?
matio (aka MAT File I/O Library) 1.5.20 and 1.5.21 has a heap-based buffer overflow in H5MM_memcpy (called from H5MM_malloc and H5C_load_entry), related to use of HDF5 1.12.0.
How severe is CVE-2021-36977?
CVE-2021-36977 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.50% probability of exploitation in the next 30 days.
How do I fix CVE-2021-36977?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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