CVE-2016-2402

MEDIUM

Squareup Okhttp < 2.7.3 - Improper Certificate Validation

Title source: rule

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.

Exploits (2)

nomisec WORKING POC 13 stars

by ikoz · poc

https://github.com/ikoz/cert-pinning-flaw-poc

View Code ZIP pw:eip

nomisec WORKING POC 10 stars

by ikoz · poc

https://github.com/ikoz/certPinningVulnerableOkHttp

View Code ZIP pw:eip

References (5)

[Mailing List, Third Party Advisory] http://www.openwall.com/lists/oss-security/2016/02/10/8

[Mailing List, Third Party Advisory] http://www.openwall.com/lists/oss-security/2016/02/18/7

[Technical Description, Third Party Advisory] https://koz.io/pinning-cve-2016-2402/

[Mailing List] https://lists.apache.org/thread.html/rd0e44e8ef71eeaaa3cf3d1b8b41eb25894372e2995ec908ce7624d26%40%3Ccommits.pulsar.apache.org%3E

[Vendor Advisory] https://publicobject.com/2016/02/11/okhttp-certificate-pinning-vulnerability/

Scores

CVSS v3 5.9

EPSS 0.0268

EPSS Percentile 85.7%

Attack Vector NETWORK

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

Classification

CWE

CWE-295

Status published

Affected Products (8)

squareup/okhttp < 2.7.3

squareup/okhttp3

com.squareup.okhttp3/okhttp < 2.7.4Maven

n/a/n/a

Timeline

Published Jan 30, 2017

Tracked Since Feb 18, 2026