What is CVE-2019-3554?

CVE-2019-3554 is a medium-severity vulnerability in Facebook Wangle, classified under Uncontrolled Resource Consumption. CVSS score: 5.9/10. Published 2019-01-15.

How severe is CVE-2019-3554?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Resource exhaustion in Facebook Wangle

CVE-2019-3554

Wangle's AcceptRoutingHandler incorrectly casts a socket when accepting a TLS 1.3 connection, leading to a potential denial of service attack against systems accepting such connections. This affects versions of Wangle prior to v2019.01.14.00

Vulnerability class: DoS (Denial of Service)

Published 2019-01-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.011 (63.1th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 63.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Facebook Wangle — versions v2019.01.14.00, unspecified

Weakness classification (CWE)

References

github.com/facebook/wangle/commit/3b17ba10a82c71e7808760e027ac6af687e06074 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2019-3554?: CVE-2019-3554 is a medium-severity vulnerability in Facebook Wangle, classified under Uncontrolled Resource Consumption. CVSS score: 5.9/10. Published 2019-01-15.
How severe is CVE-2019-3554?: Medium severity. CVSS v3 base score is 5.9 out of 10.