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CVE-2016-2402

22
FAUCET Score

CVE-2016-2402 describes a man-in-the-middle vulnerability in OkHttp versions prior to 2.7.4 and 3.1.2. Attackers could bypass certificate pinning by presenting a certificate chain that included a trusted, non-pinned CA certificate alongside the legitimate pinned certificate. This vulnerability has a medium severity CVSS score of 5.9, indicating a network-based attack with high complexity and a high impact on integrity, but no impact on confidentiality or availability. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.7.3CPE matchmatch criteria
cpe:2.3:a:squareup:okhttp:*:*:*:*:*:*:*:*
3.0.0CPE matchmatch criteria
cpe:2.3:a:squareup:okhttp3:3.0.0:*:*:*:*:*:*:*
3.0.0CPE matchmatch criteria
cpe:2.3:a:squareup:okhttp3:3.0.0:rc1:*:*:*:*:*:*
3.0.1CPE matchmatch criteria
cpe:2.3:a:squareup:okhttp3:3.0.1:*:*:*:*:*:*:*
3.1.0CPE matchmatch criteria
cpe:2.3:a:squareup:okhttp3:3.1.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.9MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.25%
Probability of exploitation in next 30 days
EPSS Percentile
81.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0225 is in the 69th percentile among its peer group of 19,955 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

mavenpatch availablevia ghsa
Product: com.squareup.okhttp3:okhttpFixed in: 2.7.4
mavenpatch availablevia ghsa
Product: com.squareup.okhttp3:okhttpFixed in: 3.1.2

Vendor Advisories (1)

mavenGHSA-4hc2-jh7r-wrc3medium

Improper Certificate Validation in OkHttp

May 13, 2022

References

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