CVE-2016-2402

VendorsquareupProductokhttp, okhttp3DiscoveredJan 30, 2017UpdatedMay 13, 2026

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.

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CVSS v3.1

5.9 MEDIUM

EPSS

1.94%

probability of exploitation in 30 days

CISA KEV

Not listed

no confirmed exploitation reported

News coverage

sources referencing this CVE

Related IOCs

seen in the same coverage

EPSS Trend

Aug 16, 2026 → Oct 22, 2026

▼ 0.31pp

2.25% → 1.94% over 2 tracked changes

CVSS v3.1 Detail

Attack VectorNETWORK

Attack ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

ScopeUNCHANGED

ConfidentialityNONE

IntegrityHIGH

AvailabilityNONE

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

Connections

3 relationships

CWE-295

source

Timeline

disclosure → media coverage

Jan 30, 2017

Disclosure — published as a CVE record. · last revised by NVD May 13, 2026

Public PoC (2)

github.com/ikoz/cert-pinning-flaw-poc github.com/ikoz/certPinningVulnerableOkHttp

Unverified third-party code — review before executing.