CVE-2019-16201

7.5 HIGH 5% exploit odds No fix listed Auth & access Web app

What it is

WEBrick::HTTPAuth::DigestAuth in Ruby through 2.4.7, 2.5.x through 2.5.6, and 2.6.x through 2.6.4 has a regular expression Denial of Service cause by looping/backtracking. A victim must expose a WEBrick server that uses DigestAuth to the Internet or a untrusted network.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of service disruption.
Exploit odds: 5.1% chance of exploitation in the next 30 days (EPSS).
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2019-11-26 18:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 02:21 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 5.1% in the next 30 days (EPSS).
Severity: 7.5 HIGH (CVSS).
Fix: none linked yet, which raises it.

Details

Published: 2019-11-26 18:15 UTC
Last modified: 2026-06-17 02:21 UTC
Exploit probability: 5.1% · EPSS, next 30 days
Weakness: CWE-287 · Improper authentication
Record status: Modified

Affected

ruby-lang Ruby ≤ 2.4.7
ruby-lang Ruby ≤ 2.5.6
ruby-lang Ruby ≤ 2.6.4
Debian Linux 8.0

Attack profile CVSS 3.1 · 7.5

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2019-16201.md and follow it. Check whether this project is affected by CVE-2019-16201. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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References

NVD record · CVE.org record