CVE-2021-33194

golang: x/net/html: infinite loop in ParseFragment

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

golang.org/x/net before v0.0.0-20210520170846-37e1c6afe023 allows attackers to cause a denial of service (infinite loop) via crafted ParseFragment input.

golang.org/x/net antes de v0.0.0-20210520170846-37e1c6afe023 permite a los atacantes provocar una denegación de servicio (bucle infinito) a través de una entrada ParseFragment manipulada

A flaw was found in golang. An attacker can craft an input to ParseFragment within parse.go that would cause it to enter an infinite loop and never return. The greatest threat to the system is of availability.

Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments. This advisory contains the container images for Red Hat OpenShift Container Platform 4.9.0. Issues addressed include bypass, denial of service, and information leakage vulnerabilities.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-05-19 CVE Reserved
2021-05-26 CVE Published
2024-08-03 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

CAPEC

References (5)

URL	Tag	Source
https://groups.google.com/g/golang-announce/c/wPunbCPkWUg	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://github.com/golang/net/commit/37e1c6afe02340126705deced573a85ab75209d7	2023-11-07

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4CHKSFMHZVOBCZSSVRE3UEYNKARTBMTM	2023-11-07
https://access.redhat.com/security/cve/CVE-2021-33194	2021-11-15
https://bugzilla.redhat.com/show_bug.cgi?id=1963232	2021-11-15

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Golang Search vendor "Golang"		Go Search vendor "Golang" for product "Go"				<= 1.15.12 Search vendor "Golang" for product "Go" and version " <= 1.15.12"		-		Affected
Golang Search vendor "Golang"		Go Search vendor "Golang" for product "Go"				>= 1.16.0 <= 1.16.4 Search vendor "Golang" for product "Go" and version " >= 1.16.0 <= 1.16.4"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				36 Search vendor "Fedoraproject" for product "Fedora" and version "36"		-		Affected