What is CVE-2019-11939?

CVE-2019-11939 is a high-severity vulnerability in Facebook Thrift, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2020-03-18.

How severe is CVE-2019-11939?

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

Resource exhaustion in Facebook Thrift

CVE-2019-11939

Golang Facebook Thrift servers would not error upon receiving messages declaring containers of sizes larger than the payload. As a result, malicious clients could send short messages which would result in a large memory allocation, potentially leading to denial of service. This issue affects Facebook Thrift prior to v2020.03.16.00.

Published 2020-03-18 · 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: 0.016 (74.2th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Facebook Thrift — versions v2020.03.16.00, unspecified
Facebook Thrift

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

github.com/facebook/fbthrift/commit/483ed864d69f307e9e3b9dadec048216100c0757 (Patch, Third Party Advisory)
www.facebook.com/security/advisories/cve-2019-11939 (Vendor Advisory)

Frequently asked questions

What is CVE-2019-11939?: CVE-2019-11939 is a high-severity vulnerability in Facebook Thrift, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2020-03-18.
How severe is CVE-2019-11939?: High severity. CVSS v3 base score is 7.5 out of 10.