CVE-2021-41611

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An issue was discovered in Squid 5.0.6 through 5.1.x before 5.2. When validating an origin server or peer certificate, Squid may incorrectly classify certain certificates as trusted. This problem allows a remote server to obtain security trust well improperly. This indication of trust may be passed along to clients, allowing access to unsafe or hijacked services.

Se ha detectado un problema en Squid versiones 5.0.6 hasta 5.1.x anteriores a 5.2. Cuando se comprueba un certificado de servidor de origen o de pares, Squid puede clasificar incorrectamente determinados certificados como confiable. Este problema permite que un servidor remoto obtenga la confianza de seguridad de forma inapropiada. Esta indicación confiable puede ser transmitida a clientes, permitiendo el acceso a servicios no seguros o secuestrados

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-09-25 CVE Reserved
2021-10-18 CVE Published
2024-07-03 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-295: Improper Certificate Validation

CAPEC

References (4)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2021/12/23/2	Mailing List

URL	Date	SRC

URL	Date	SRC
https://github.com/squid-cache/squid/security/advisories/GHSA-47m4-g3mv-9q5r	2023-11-07

URL	Date	SRC
http://www.squid-cache.org/Versions/v6/changesets/squid-6-43d6b5c81b88ec2256b430c69a872a1e4f324e4a.patch	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CWQ2WKDWTSO47S3F6XJJ6HGG2ULWEAE4	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				>= 5.0.6 < 5.2 Search vendor "Squid-cache" for product "Squid" and version " >= 5.0.6 < 5.2"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				35 Search vendor "Fedoraproject" for product "Fedora" and version "35"		-		Affected