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CVE-2021-0341

Square OkHttp can accept the wrong certificate

7.5 HighFix available

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-11Android ID: A-171980069

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.88%Up 0.5 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 7.5

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-11Android ID: A-171980069

Record
CVE-2021-0341
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:P/I:N/A:N
Weakness
CWE-295
Updated
2026-11-02
CVE List No score

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-11Android ID: A-171980069

Record
CVE-2021-0341
Updated
2026-11-02
EUVDEUVD-2021-2960 No score

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-11Android ID: A-171980069

Record
EUVD-2021-2960
Updated
2026-11-03
GitHub AdvisoriesGHSA-3cqm-mf7h-prrj 7.5

Square OkHttp can accept the wrong certificate

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

Record
GHSA-3cqm-mf7h-prrj
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-295
Updated
2026-11-02
OSVGHSA-3cqm-mf7h-prrj 7.5

Square OkHttp can accept the wrong certificate

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

Record
GHSA-3cqm-mf7h-prrj
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-295
Updated
2026-11-02
OSVRHSA-2023:2705 7.5

Red Hat Security Advisory: Red Hat Single Sign-On 7.6.3 security update on RHEL 7

Record
RHSA-2023:2705
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
Show 5 moreShow less
OSVRHSA-2023:2706 7.5

Red Hat Security Advisory: Red Hat Single Sign-On 7.6.3 security update on RHEL 8

Record
RHSA-2023:2706
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2023:2707 7.5

Red Hat Security Advisory: Red Hat Single Sign-On 7.6.3 security update on RHEL 9

Record
RHSA-2023:2707
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVROOT-APP-MAVEN-CVE-2021-0341 7.5

CVE-2021-0341 in com.squareup.okhttp3:okhttp - Patched by Root

Root has patched CVE-2021-0341 in the com.squareup.okhttp3:okhttp package for Root:Maven. Multiple fixed versions available.

Record
ROOT-APP-MAVEN-CVE-2021-0341
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVASB-A-171980069 No score

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.

Record
ASB-A-171980069
Updated
2026-11-02
OSVCLSA-2025-1766707708 No score

TuxCare security update for com.squareup.okhttp3:okhttp (1 CVE)

TuxCare rebuilt com.squareup.okhttp3:okhttp to address 1 CVE. Fixed in 3.14.9-tuxcare.1.

Record
CLSA-2025-1766707708
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
com.squareup.okhttp3:okhttp
Maven
 before 4.9.2
4.9.2
platform/external/okhttp
Android
 8.0:0 up to 8.0:2021-02-01, plus listed versions
8.0
8.0:2021-02-01
platform/libcore
Android
 8.0:0 up to 8.0:2021-02-01, plus listed versions
8.0
8.0:2021-02-01
platform/external/okhttp
Android
 8.1:0 up to 8.1:2021-02-01, plus listed versions
8.1
8.1:2021-02-01
platform/libcore
Android
 8.1:0 up to 8.1:2021-02-01, plus listed versions
8.1
8.1:2021-02-01
platform/external/okhttp
Android
 9:0 up to 9:2021-02-01, plus listed versions
9
9:2021-02-01
platform/libcore
Android
 9:0 up to 9:2021-02-01, plus listed versions
9
9:2021-02-01
platform/external/okhttp
Android
 10:0 up to 10:2021-02-01, plus listed versions
10
10:2021-02-01
platform/libcore
Android
 10:0 up to 10:2021-02-01, plus listed versions
10
10:2021-02-01
platform/external/okhttp
Android
 11:0 up to 11:2021-02-01, plus listed versions
11
11:2021-02-01
Show 11 moreShow less
Affected packages
PackageAffectedFixed
platform/libcore
Android
 11:0 up to 11:2021-02-01, plus listed versions
11
11:2021-02-01
com.squareup.okhttp3:okhttp
TuxCare:Maven
 3.14.9 up to 3.14.9-tuxcare.1
3.14.9-tuxcare.1
com.squareup.okhttp3:okhttp
Maven
 before 4.9.2, plus listed versions
3.0.03.0.0-RC13.0.13.1.03.1.1
Show 45 moreShow less
3.1.23.10.03.11.03.12.03.12.13.12.103.12.113.12.123.12.133.12.23.12.33.12.43.12.53.12.63.12.73.12.83.12.93.13.03.13.13.14.03.14.13.14.23.14.33.14.43.14.53.14.63.14.73.14.83.14.93.2.03.3.03.3.13.4.03.4.0-RC13.4.13.4.23.5.03.6.03.7.03.8.03.8.13.9.03.9.14.0.04.0.0-RC1
4.9.2
rh-sso7-keycloak
Red Hat:red_hat_single_sign_on:7.6::el7
 before 0:18.0.7-1.redhat_00001.1.el7sso
0:18.0.7-1.redhat_00001.1.el7sso
rh-sso7-keycloak-server
Red Hat:red_hat_single_sign_on:7.6::el7
 before 0:18.0.7-1.redhat_00001.1.el7sso
0:18.0.7-1.redhat_00001.1.el7sso
rh-sso7-keycloak
Red Hat:red_hat_single_sign_on:7.6::el8
 before 0:18.0.7-1.redhat_00001.1.el8sso
0:18.0.7-1.redhat_00001.1.el8sso
rh-sso7-keycloak-server
Red Hat:red_hat_single_sign_on:7.6::el8
 before 0:18.0.7-1.redhat_00001.1.el8sso
0:18.0.7-1.redhat_00001.1.el8sso
rh-sso7-keycloak
Red Hat:red_hat_single_sign_on:7.6::el9
 before 0:18.0.7-1.redhat_00001.1.el9sso
0:18.0.7-1.redhat_00001.1.el9sso
rh-sso7-keycloak-server
Red Hat:red_hat_single_sign_on:7.6::el9
 before 0:18.0.7-1.redhat_00001.1.el9sso
0:18.0.7-1.redhat_00001.1.el9sso
com.squareup.okhttp3:okhttp
Root:Maven
 before 3.14.9-aikido.1
3.14.9-aikido.14.6.0-aikido.13.14.9-aikido.2
io.root.com.squareup.okhttp3:okhttp
Root:Maven
 before 3.14.9-root.io.1
3.14.9-root.io.14.6.0-root.io.13.14.9-root.io.2

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-0341 is a high vulnerability (CVSS 7.5) in Google Android, published February 1, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.88%, the 59th percentile. Fixed in com.squareup.okhttp3:okhttp 4.9.2.

References

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Left out here: 24 versions. The JSON record has them.

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