CVE-2019-16201
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (5.09%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 5.09% probability · 92th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-287
- Affected
- ruby-lang/ruby · debian/debian linux
- Source
- cve@mitre.org
EPSS 5.1% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00041.html
- https://hackerone.com/reports/661722Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/11/msg00025.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/12/msg00009.html
- https://lists.debian.org/debian-lts-announce/2020/08/msg00027.html
- https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html
- https://seclists.org/bugtraq/2019/Dec/31
- https://seclists.org/bugtraq/2019/Dec/32
- https://security.gentoo.org/glsa/202003-06
- https://www.debian.org/security/2019/dsa-4587
- https://www.oracle.com/security-alerts/cpujan2020.html
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00041.html
- https://hackerone.com/reports/661722Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/11/msg00025.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/12/msg00009.html
- https://lists.debian.org/debian-lts-announce/2020/08/msg00027.html
- https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html
- https://seclists.org/bugtraq/2019/Dec/31
- https://seclists.org/bugtraq/2019/Dec/32
- https://security.gentoo.org/glsa/202003-06
- https://www.debian.org/security/2019/dsa-4587
- https://www.oracle.com/security-alerts/cpujan2020.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.