What is CVE-2019-3564?

CVE-2019-3564 is a high-severity vulnerability in Facebook Thrift, classified under Excessive Iteration. CVSS score: 7.5/10. Published 2019-05-06.

How severe is CVE-2019-3564?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Facebook Thrift

CVE-2019-3564

Go Facebook Thrift servers would not error upon receiving messages with containers of fields of unknown type. As a result, malicious clients could send short messages which would take a long time for the server to parse, potentially leading to denial of service. This issue affects Facebook Thrift prior to v2019.03.04.00.

Published 2019-05-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.020 (79.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000

Affected products

Facebook Thrift — versions v2019.03.04.00, unspecified
Facebook Thrift

Weakness classification (CWE)

References

github.com/facebook/fbthrift/commit/c461c1bd1a3e130b181aa9c854da3030cd4b5156 (Patch, Third Party Advisory)
www.facebook.com/security/advisories/cve-2019-3564 (Vendor Advisory)
lists.apache.org/thread.html/rd0e44e8ef71eeaaa3cf3d1b8b41eb25894372e2995ec908ce… (mailing-list)

Frequently asked questions

What is CVE-2019-3564?: CVE-2019-3564 is a high-severity vulnerability in Facebook Thrift, classified under Excessive Iteration. CVSS score: 7.5/10. Published 2019-05-06.
How severe is CVE-2019-3564?: High severity. CVSS v3 base score is 7.5 out of 10.