CVE-2016-2402

Name: CVE-2016-2402
Creator: NVD / NIST
Published: 2017-01-30T22:59:00.39+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 2.25%

Last modified Jun 17, 2026

CVE-2016-2402 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. OkHttp before 2.7.4 and 3.x before 3.1.2 allows man-in-the-middle attackers to bypass certificate pinning by sending a certificate chain with a certificate from a non-pinned trusted CA and the pinned certificate.. EPSS estimates a 2.25% chance of exploitation in the next 30 days.

Description

OkHttp before 2.7.4 and 3.x before 3.1.2 allows man-in-the-middle attackers to bypass certificate pinning by sending a certificate chain with a certificate from a non-pinned trusted CA and the pinned certificate.

Metrics

CVSS 3.1

5.9/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

2.25%

80.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-295

Affected Software

Vendor	Product	Versions
Squareup	Okhttp	<= 2.7.3
Squareup	Okhttp3	3.0.0
Squareup	Okhttp3	3.0.1
Squareup	Okhttp3	3.1.0
Squareup	Okhttp3	3.1.1

References

http://www.openwall.com/lists/oss-security/2016/02/10/8Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/02/18/7Mailing List, Third Party Advisory
https://koz.io/pinning-cve-2016-2402/Technical Description, Third Party Advisory
https://lists.apache.org/thread.html/rd0e44e8ef71eeaaa3cf3d1b8b41eb25894372e2995ec908ce7624d26%40%3Ccommits.pulsar.apache.org%3E
https://publicobject.com/2016/02/11/okhttp-certificate-pinning-vulnerability/Vendor Advisory
http://www.openwall.com/lists/oss-security/2016/02/10/8Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/02/18/7Mailing List, Third Party Advisory
https://koz.io/pinning-cve-2016-2402/Technical Description, Third Party Advisory
https://lists.apache.org/thread.html/rd0e44e8ef71eeaaa3cf3d1b8b41eb25894372e2995ec908ce7624d26%40%3Ccommits.pulsar.apache.org%3E
https://publicobject.com/2016/02/11/okhttp-certificate-pinning-vulnerability/Vendor Advisory

Timeline

Published: Jan 30, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2016-2402?

How severe is CVE-2016-2402?

CVE-2016-2402 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 2.25% probability of exploitation in the next 30 days.

How do I fix CVE-2016-2402?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2016-2402?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST