CVE-2021-0341: Okhttp Square OkHttp Can Accept The Vulnerability

HIGH
Advisory Identifier: GHSA-3cqm-mf7h-prrj
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CVSS 7.5
CWE-295
Published
Advisory Summary

CVE-2021-0341 is a HIGH (CVSS 7.5) square okhttp can accept the vulnerability (CWE-295: Improper Certificate Validation) affecting Okhttp libraries in the Maven ecosystem. The issue involves square okhttp can accept the wrong certificate. Remediation is available by upgrading affected packages to version 4.9.2.

CVE-2021-0341 at a Glance

CVE Identifier CVE-2021-0341
GHSA Identifier GHSA-3cqm-mf7h-prrj
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-295: Improper Certificate Validation
Affected Product Okhttp
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2021-0341

To remediate this vulnerability, upgrade all affected Okhttp dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

com.squareup.okhttp3:okhttp fixed: 4.9.2 
<dependency>
    <groupId>com.squareup.okhttp3</groupId>
    <artifactId>okhttp</artifactId>
    <version>4.9.2</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=com.squareup.okhttp3

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2021-0341, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=com.squareup.okhttp3

Analyze the terminal output to locate any version of Okhttp in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.9.2), your application is affected.

Note: The mvn dependency:tree -Dincludes=com.squareup.okhttp3 command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-295: Improper Certificate Validation, where the product does not validate, or incorrectly validates, a certificate. In Okhttp, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

In verifyHostName of OkHostnameVerifier.java, there is a possible way to accept a certificate for the wrong domain due to improperly used crypto. This could lead to remote information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation. Product: AndroidVersions: Android-8.1 Android-9 Android-10 Android-11 Android ID: A-171980069

CVE-2021-0341 Affected Okhttp Versions

1 component(s)
Fixed Versions:
4.9.2
Product / Package Ecosystem Affected Versions Fixed Version
com.squareup.okhttp3:okhttp
maven/com.squareup.okhttp3/okhttp
Maven
< 4.9.2
4.9.2

References

NVD — CVE-2021-0341 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-0341
Okhttp Source Repository REPOSITORY
https://github.com/square/okhttp/issues/6724
Okhttp Source Repository REPOSITORY
https://github.com/square/okhttp/pull/6741
Security Fix Commit FIX COMMIT
https://github.com/square/okhttp/commit/f574ea2f5259d9040f264ddeb582fb1ce563f10c
Okhttp Source Repository REPOSITORY
https://github.com/square/okhttp
Okhttp Security Information SECURITY
https://source.android.com/security/bulletin/2021-02-01

Frequently Asked Questions

What is CVE-2021-0341?
CVE-2021-0341 is a security vulnerability in Okhttp involving Square OkHttp can accept the wrong certificate under CWE-295: Improper Certificate Validation.
Which Okhttp versions are affected?
Affected versions include releases prior to 4.9.2 across affected packages: com.squareup.okhttp3:okhttp.
What version fixes CVE-2021-0341?
Upgrading to 4.9.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is okhttp affected?
Yes, com.squareup.okhttp3:okhttp is affected in releases prior to 4.9.2. Upgrade your dependency to 4.9.2 or later.
What is the CVSS score of CVE-2021-0341?
CVE-2021-0341 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2021-0341?
CVE-2021-0341 is classified under CWE-295: Improper Certificate Validation (The product does not validate, or incorrectly validates, a certificate.).
How can I check Maven dependencies for CVE-2021-0341?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=com.squareup.okhttp3'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-3cqm-mf7h-prrj",
  "modified" : "2025-11-13T16:34:06Z",
  "published" : "2022-05-24T17:41:45Z",
  "aliases" : [ "CVE-2021-0341" ],
  "summary" : "Square OkHttp can accept the wrong certificate",
  "details" : "In verifyHostName of OkHostnameVerifier.java, there is a possible way to accept a certificate for the wrong domain due to improperly used crypto. This could lead to remote information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation. Product: AndroidVersions: Android-8.1 Android-9 Android-10 Android-11 Android ID: A-171980069",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "com.squareup.okhttp3:okhttp"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.9.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-0341"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/square/okhttp/issues/6724"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/square/okhttp/pull/6741"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/square/okhttp/commit/f574ea2f5259d9040f264ddeb582fb1ce563f10c"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/square/okhttp"
  }, {
    "type" : "WEB",
    "url" : "https://source.android.com/security/bulletin/2021-02-01"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-295" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-11-13T16:34:06Z",
    "nvd_published_at" : "2021-02-10T17:15:00Z"
  }
}