Detections
Analytics
SCA: security update for waitress (GHSA-73m2-3pwg-5fgc)
medium Tenable Self-Hosted Container Security Plugin ID 422149
Description
There are packages installed that are affected by a vulnerability referenced in the following CVE:- Waitress version 1.4.2 allows a DOS attack When waitress receives a header that contains invalid
characters. When a header like "Bad-header: xxxxxxxxxxxxxxx\x10" is received, it will cause the regular
expression engine to catastrophically backtrack causing the process to use 100% CPU time and blocking any
other interactions. This allows an attacker to send a single request with an invalid header and take the
service offline. This issue was introduced in version 1.4.2 when the regular expression was updated to
attempt to match the behaviour required by errata associated with RFC7230. The regular expression that is
used to validate incoming headers has been updated in version 1.4.3, it is recommended that people upgrade
to the new version of Waitress as soon as possible. (CVE-2020-5236)
See Also
Plugin Details
Severity: Medium
ID: 422149
Version: Revision 1.3
Type: Local
Family: SCA Checks
Published: 3/28/2025
Updated: 7/2/2026
Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security
Risk Information
VPR
Risk Factor: Low
Score: 3
Percentile: 23.18
Vendor
Vendor Severity: Medium
CVSS v2
Risk Factor: Medium
Base Score: 6.8
Temporal Score: 5.3
Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:C
CVSS Score Source: CVE-2020-5236
CVSS v3
Risk Factor: Medium
Base Score: 6.5
Temporal Score: 5.9
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
CVSS v4
Risk Factor: Medium
Base Score: 6.9
Threat Score: 5.5
Threat Vector: CVSS:4.0/E:P
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Vulnerability Information
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 2/4/2020
Vulnerability Publication Date: 2/4/2020
Reference Information
CVE: CVE-2020-5236
cwe: CWE-400