MEDIUM
CVE-2016-2402
CWE-295Published: January 30, 2017· Updated: Jun 17, 2026
5.9
CVSS v3.1
Official 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.
Technical Analysis
CVE-2016-2402 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 5.9.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Affected Vendors & Products
squareup2 product(s)
okhttpokhttp3
Source: NVD CPE · 5 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (10)
→
http://www.openwall.com/lists/oss-security/2016/02/10/8Mailing List · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2016/02/18/7Mailing List · Third Party Advisory
→
https://koz.io/pinning-cve-2016-2402/Technical Description · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2016/02/10/8Mailing List · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2016/02/18/7Mailing List · Third Party Advisory
→
https://koz.io/pinning-cve-2016-2402/Technical Description · Third Party Advisory
Quick Facts
CVE IDCVE-2016-2402
CVSS Score5.9 / 10
SeverityMEDIUM
WeaknessCWE-295
CISA KEVNo
Affected1 vendor(s)
PublishedJan 30, 2017
Related CVEs (CWE-295)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2016-2402 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.