What is CVE-2021-24028?

CVE-2021-24028 is a critical-severity vulnerability in Facebook Thrift, classified under Release of Invalid Pointer or Reference. CVSS score: 9.8/10. Published 2021-04-14.

How severe is CVE-2021-24028?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Facebook Thrift

CVE-2021-24028

An invalid free in Thrift's table-based serialization can cause the application to crash or potentially result in code execution or other undesirable effects. This issue affects Facebook Thrift prior to v2021.02.22.00.

Published 2021-04-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.017 (76.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 76.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Facebook Thrift — versions unspecified, v2021.02.22.00
Facebook Thrift

Weakness classification (CWE)

CWE-763 — Release of Invalid Pointer or Reference

References

github.com/facebook/fbthrift/commit/bfda1efa547dce11a38592820916db01b05b9339 (Patch, Third Party Advisory)
www.facebook.com/security/advisories/cve-2021-24028 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-24028?: CVE-2021-24028 is a critical-severity vulnerability in Facebook Thrift, classified under Release of Invalid Pointer or Reference. CVSS score: 9.8/10. Published 2021-04-14.
How severe is CVE-2021-24028?: Critical severity. CVSS v3 base score is 9.8 out of 10.