http4s up to 0.21.26/0.22.2/0.23.1/1.0.0-M24 CORS Configuration cross-domain policy

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k0.00

Summaryinfo

A vulnerability was found in http4s up to 0.21.26/0.22.2/0.23.1/1.0.0-M24 and classified as critical. This affects an unknown part of the component CORS Configuration. The manipulation results in cross-domain policy. This vulnerability is known as CVE-2021-39185. It is possible to launch the attack remotely. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in http4s up to 0.21.26/0.22.2/0.23.1/1.0.0-M24. Affected is an unknown code of the component CORS Configuration. The manipulation with an unknown input leads to a cross-domain policy vulnerability. CWE is classifying the issue as CWE-942. The product uses a cross-domain policy file that includes domains that should not be trusted. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was published 09/02/2021. The advisory is shared for download at github.com. This vulnerability is traded as CVE-2021-39185. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

Upgrading to version 0.21.27, 0.22.3, 0.23.2 or 1.0.0-M25 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2021-1978). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross-domain policy
CWE: CWE-942 / CWE-346 / CWE-345
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: http4s 0.21.27/0.22.3/0.23.2/1.0.0-M25

Timelineinfo

08/16/2021 🔍
09/02/2021 +17 days 🔍
09/02/2021 +0 days 🔍
12/11/2025 +1561 days 🔍

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-39185 (🔍)
GCVE (CVE): GCVE-0-2021-39185
GCVE (VulDB): GCVE-100-181920
EUVD: 🔍

Entryinfo

Created: 09/02/2021 10:12
Updated: 12/11/2025 23:31
Changes: 09/02/2021 10:12 (38), 09/05/2021 02:46 (3), 09/05/2021 02:53 (1), 12/11/2025 23:31 (15)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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