What’s Vulnerable › Vulnerabilities

CVE-2016-2402

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-01-30 · updated 2026-06-17
• Weakness: CWE-295

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.

Affected products

• Squareup Okhttp: through 2.7.3
• Squareup Okhttp3: 3.0.0, 3.0.0-rc1, 3.0.1, 3.1.0, 3.1.1

References

• http://www.openwall.com/lists/oss-security/2016/02/10/8
• http://www.openwall.com/lists/oss-security/2016/02/18/7
• https://koz.io/pinning-cve-2016-2402/
• https://lists.apache.org/thread.html/rd0e44e8ef71eeaaa3cf3d1b8b41eb25894372e2995ec908ce7624d26%40%3Ccommits.pulsar.apache.org%3E
• https://publicobject.com/2016/02/11/okhttp-certificate-pinning-vulnerability/
• http://www.openwall.com/lists/oss-security/2016/02/10/8
• http://www.openwall.com/lists/oss-security/2016/02/18/7
• https://koz.io/pinning-cve-2016-2402/
• https://lists.apache.org/thread.html/rd0e44e8ef71eeaaa3cf3d1b8b41eb25894372e2995ec908ce7624d26%40%3Ccommits.pulsar.apache.org%3E
• https://publicobject.com/2016/02/11/okhttp-certificate-pinning-vulnerability/

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