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CVE-2019-5737

nodejs: Insufficient Slowloris fix causing DoS via server.headersTimeout bypass

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Severity

Low

Red Hat Product Security

5.3

CVSS 3.0

Review impact separately from score.

Published · February 28, 2019

Updated · June 28, 2026

Description

It was found that the original fix for Slowloris, CVE-2018-12122, was insufficient. It is possible to bypass the server's headersTimeout by sending two specially crafted HTTP requests in the same connection. An attacker could use this flaw to bypass Slowloris protection, resulting in a denial of service.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

The use of a Load Balancer or a Reverse Proxy will increase the difficulty of the attack.

CVSS / CWE

CVSS 3.0 · 5.3
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CWE-400 · Uncontrolled Resource Consumption