How severe is CVE-2019-3554?

CVE-2019-3554 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2019-3554 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-3554?

CVE-2019-3554 affects Facebook Wangle. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-3554?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2019-3554 published?

CVE-2019-3554 was published on 2019-01-15 and last updated on 2026-06-17.

CVE-2019-3554

CVE-2019-3554 is a medium-severity vulnerability in Facebook Wangle with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-19.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-19
Affected product: Facebook Wangle
Published: 2019-01-15
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is 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
How severe is CVE-2019-3554?: CVE-2019-3554 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2019-3554 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-3554?: CVE-2019-3554 affects Facebook Wangle. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-3554?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-3554 published?: CVE-2019-3554 was published on 2019-01-15 and last updated on 2026-06-17.

References

https://github.com/facebook/wangle/commit/3b17ba10a82c71e7808760e027ac6af687e06074

Affected products (1)

cpe:2.3:a:facebook:wangle:*:*:*:*:*:*:*:*

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