How severe is CVE-2021-0341?

No CVSS score has been assigned to CVE-2021-0341 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2021-0341?

CVE-2021-0341 affects the following packages: platform/external/okhttp (Android), platform/libcore (Android), platform/external/okhttp (Android), platform/libcore (Android), platform/external/okhttp (Android), platform/libcore (Android), platform/external/okhttp (Android), platform/libcore (Android), and 2 more. Ecosystems affected: Android.

How do I fix CVE-2021-0341?

Update platform/external/okhttp to 8.0:2021-02-01 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-0341 is resolved across your whole dependency graph.

How do I detect CVE-2021-0341 in my Android dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for platform/external/okhttp, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2021-0341 if there is no patch (or I can't update yet)?

Assume what was exposed is already known: rotate any credential, token or key that the affected component could return, restrict the endpoint to callers that genuinely need it, and strip sensitive fields from responses and error output at the boundary rather than relying on the client not to read them.

Is CVE-2021-0341 actively exploited in the wild?

No public exploit code has been indexed for CVE-2021-0341 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2021-0341?

CVE-2021-0341 has an EPSS (Exploit Prediction Scoring System) score of 0.9%, placing it in the 59th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2021-0341?

CVE-2021-0341 is classified as CWE-295 (CWE-295). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2021-0341 published, and has it been updated?

CVE-2021-0341 was published on February 1, 2021 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦 Android

Not in CISA KEV

CVE-2021-0341 — okhttp

CVE-2021-0341 is a CWE-295 vulnerability in platform/external/okhttp. A fix is available for platform/external/okhttp — see the affected versions and patch details below.

Also known asA-171980069GHSA-3cqm-mf7h-prrj

Published

Feb 1, 2021

Updated

Oct 28, 2026

Affected

10 pkgs

Patched

10 / 10

Exploits

None indexed

Exploitation data as of Nov 2, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.9%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs59th percentile — riskier than 59% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

10 pkgs affected

📦platform/external/okhttp📦platform/libcore📦platform/external/okhttp📦platform/libcore📦platform/external/okhttp📦platform/libcore📦platform/external/okhttp📦platform/libcore+2 more

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Android packages — download data is not available via public APIs for these ecosystems.

Description

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

Affected Packages

10 total 10 fixed

Ecosystem	Package	Vulnerable range	Fix
📦Android	`platform/external/okhttp`	≥ 8.0:0&&< 8.0:2021-02-01	8.0:2021-02-01
📦Android	`platform/libcore`	≥ 8.0:0&&< 8.0:2021-02-01	8.0:2021-02-01
📦Android	`platform/external/okhttp`	≥ 8.1:0&&< 8.1:2021-02-01	8.1:2021-02-01
📦Android	`platform/libcore`	≥ 8.1:0&&< 8.1:2021-02-01	8.1:2021-02-01
📦Android	`platform/external/okhttp`	≥ 9:0&&< 9:2021-02-01	9:2021-02-01
📦Android	`platform/libcore`	≥ 9:0&&< 9:2021-02-01	9:2021-02-01

Affected Products

1 product · 4 configurations

androidgoogle

4 versions

8.19.010.011.0

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for platform/external/okhttp, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update platform/external/okhttp to 8.0:2021-02-01 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-0341 is resolved across your whole dependency graph.
Workarounds
Assume what was exposed is already known: rotate any credential, token or key that the affected component could return, restrict the endpoint to callers that genuinely need it, and strip sensitive fields from responses and error output at the boundary rather than relying on the client not to read them.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

Product	Fixed in	Advisory
Red Hat AMQ Streams 2.4.0	`okhttp`	RHSA-2023:3223
Red Hat Data Grid 8.4.2	`okhttp`	RHSA-2023:2723
Red Hat JBoss Enterprise Application Platform Expansion Pack	`okhttp`	RHSA-2023:0756
Red Hat OpenShift Dev Spaces 3 Containers	`devspaces/server-rhel8:3.16-14`	RHSA-2024:6667
Red Hat Single Sign-On 7	`okhttp`	RHSA-2023:2713
Red Hat Single Sign-On 7.6 for RHEL 7	`rh-sso7-keycloak-0:18.0.7-1.redhat_00001.1.el7sso`	RHSA-2023:2705
Red Hat Single Sign-On 7.6 for RHEL 8	`rh-sso7-keycloak-0:18.0.7-1.redhat_00001.1.el8sso`	RHSA-2023:2706
Red Hat Single Sign-On 7.6 for RHEL 9	`rh-sso7-keycloak-0:18.0.7-1.redhat_00001.1.el9sso`	RHSA-2023:2707

Frequently Asked Questions

O3 Security · Impact-Aware SCA

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