7.5
HIGH
CVE-2021-41611
Squid SSL/TLS Trusted Certificate Verification Vulnerability
Description

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.

INFO

Published Date :

Oct. 18, 2021, 9:15 a.m.

Last Modified :

Nov. 7, 2023, 3:38 a.m.

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2021-41611 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Fedoraproject fedora
1 Squid-cache squid
References to Advisories, Solutions, and Tools

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-41611 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-41611 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Nov. 07, 2023

    Action Type Old Value New Value
    Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CWQ2WKDWTSO47S3F6XJJ6HGG2ULWEAE4/ [No types assigned]
    Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/CWQ2WKDWTSO47S3F6XJJ6HGG2ULWEAE4/
  • Modified Analysis by [email protected]

    Mar. 31, 2022

    Action Type Old Value New Value
    Changed Reference Type http://www.openwall.com/lists/oss-security/2021/12/23/2 No Types Assigned http://www.openwall.com/lists/oss-security/2021/12/23/2 Mailing List, Third Party Advisory
  • CVE Modified by [email protected]

    Dec. 23, 2021

    Action Type Old Value New Value
    Added Reference http://www.openwall.com/lists/oss-security/2021/12/23/2 [No Types Assigned]
  • Modified Analysis by [email protected]

    Nov. 28, 2021

    Action Type Old Value New Value
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/CWQ2WKDWTSO47S3F6XJJ6HGG2ULWEAE4/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/CWQ2WKDWTSO47S3F6XJJ6HGG2ULWEAE4/ Mailing List, Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Nov. 17, 2021

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/CWQ2WKDWTSO47S3F6XJJ6HGG2ULWEAE4/ [No Types Assigned]
  • Modified Analysis by [email protected]

    Nov. 17, 2021

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Nov. 10, 2021

    Action Type Old Value New Value
    Removed Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/CWQ2WKDWTSO47S3F6XJJ6HGG2ULWEAE4/ [No Types Assigned]
  • CVE Modified by [email protected]

    Oct. 30, 2021

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/CWQ2WKDWTSO47S3F6XJJ6HGG2ULWEAE4/ [No Types Assigned]
  • Initial Analysis by [email protected]

    Oct. 21, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:N/A:N)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    Changed Reference Type http://www.squid-cache.org/Versions/v6/changesets/squid-6-43d6b5c81b88ec2256b430c69a872a1e4f324e4a.patch No Types Assigned http://www.squid-cache.org/Versions/v6/changesets/squid-6-43d6b5c81b88ec2256b430c69a872a1e4f324e4a.patch Vendor Advisory
    Changed Reference Type https://github.com/squid-cache/squid/security/advisories/GHSA-47m4-g3mv-9q5r No Types Assigned https://github.com/squid-cache/squid/security/advisories/GHSA-47m4-g3mv-9q5r Patch, Third Party Advisory
    Added CWE NIST CWE-295
    Added CPE Configuration OR *cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:* versions from (including) 5.0.6 up to (excluding) 5.2
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-41611 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-41611 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.14 }} 0.01%

score

0.50024

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability