CVE-2016-2402

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.

Published: 2017-01-30 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-2402 is rated Moderate Risk (48.4/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.68%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2016-2402

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-07-22 11.12% 2.68% -8.44%
2 2025-06-25 5.26% 11.12% +5.86%
3 2025-03-30 — 5.26% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-2402

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.9 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 2.2 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2016-2402

GitHub Security Advisory for CVE-2016-2402

GHSA-4hc2-jh7r-wrc3 · Severity: medium · Ecosystem: maven — Improper Certificate Validation in OkHttp

Affected software / configurations for CVE-2016-2402

Vendor Product Version Raw CPE
squareup okhttp <= 2.7.3 cpe:2.3:a:squareup:okhttp:*:*:*:*:*:*:*:*
squareup okhttp3 3.0.0 cpe:2.3:a:squareup:okhttp3:3.0.0:*:*:*:*:*:*:*
squareup okhttp3 3.0.0 cpe:2.3:a:squareup:okhttp3:3.0.0:rc1:*:*:*:*:*:*
squareup okhttp3 3.0.1 cpe:2.3:a:squareup:okhttp3:3.0.1:*:*:*:*:*:*:*
squareup okhttp3 3.1.0 cpe:2.3:a:squareup:okhttp3:3.1.0:*:*:*:*:*:*:*
squareup okhttp3 3.1.1 cpe:2.3:a:squareup:okhttp3:3.1.1:*:*:*:*:*:*:*

References for CVE-2016-2402

cvelogic Threat Intelligence