HOMEVULNERABILITIESCVE-2018-20200
MEDIUM

CVE-2018-20200

CWE-295Published: April 18, 2019· Updated: Jun 17, 2026

5.9
CVSS v3.1

Official Description

CertificatePinner.java in OkHttp 3.x through 3.12.0 allows man-in-the-middle attackers to bypass certificate pinning by changing SSLContext and the boolean values while hooking the application. NOTE: This id is disputed because some parties don't consider this is a vulnerability. Their rationale can be found in https://github.com/square/okhttp/issues/4967

NVD Source

Technical Analysis

CVE-2018-20200 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 complete confidentiality breach (data exposure), 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
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

squareup1 product(s)
okhttp
Source: NVD CPE · 1 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

PATCHhttps://github.com/square/okhttp/commits/master
PATCHhttps://github.com/square/okhttp/commits/master
ADVISORYhttps://cxsecurity.com/issue/WLB-2018120252
ADVISORYhttps://square.github.io/okhttp/3.x/okhttp/
ADVISORYhttps://cxsecurity.com/issue/WLB-2018120252
ADVISORYhttps://square.github.io/okhttp/3.x/okhttp/

All References (30)

→
https://cxsecurity.com/issue/WLB-2018120252Exploit · Third Party Advisory
→
https://github.com/square/okhttp/commits/masterPatch · Third Party Advisory
→
https://github.com/square/okhttp/issues/4967
→
https://github.com/square/okhttp/releasesProduct
→
https://lists.apache.org/thread.html/519eb0fd45642dcecd9ff74cb3e71c20a4753f7d82e2f07864b5108f%40%3Cdev.drill.apache.org%3E
→
https://lists.apache.org/thread.html/b0656d359c7d40ec9f39c8cc61bca66802ef9a2a12ee199f5b0c1442%40%3Cdev.drill.apache.org%3E
→
https://lists.apache.org/thread.html/f9bc3e55f4e28d1dcd1a69aae6d53e609a758e34d2869b4d798e13cc%40%3Cissues.drill.apache.org%3E
→
https://lists.apache.org/thread.html/r0dd7ff197b2e3bdd80a0326587ca3d0c22e10d1dba17c769d6da7d7a%40%3Cuser.flink.apache.org%3E
→
https://lists.apache.org/thread.html/r71100f23778d72fbd8be8baa6baffc159b9c4f3fae3db4826bdc8ab8%40%3Cissues.flink.apache.org%3E
→
https://lists.apache.org/thread.html/r78bfce980843be61a55615a7680bbf7ac751a9b3515231eab2d32068%40%3Cissues.flink.apache.org%3E
→
https://lists.apache.org/thread.html/rc436d58531754ac8fe20340044566518ea4dce66aeff9193356a225d%40%3Cissues.flink.apache.org%3E
→
https://lists.apache.org/thread.html/rd0e44e8ef71eeaaa3cf3d1b8b41eb25894372e2995ec908ce7624d26%40%3Ccommits.pulsar.apache.org%3E
→
https://lists.apache.org/thread.html/recce57e195fbdd856dcf1933c136a8a66d7b02e05e3580f44d75a640%40%3Cissues.flink.apache.org%3E
→
https://lists.apache.org/thread.html/rfd1eed12ba2a5dff37229edd60fc84a25517815d848994146a15af91%40%3Cissues.flink.apache.org%3E
→
https://square.github.io/okhttp/3.x/okhttp/Third Party Advisory

Quick Facts

CVE IDCVE-2018-20200
CVSS Score5.9 / 10
SeverityMEDIUM
WeaknessCWE-295
CISA KEVNo
Affected1 vendor(s)
PublishedApr 18, 2019

Related CVEs (CWE-295)

CVE-2026-4370
10.0
CVE-2022-42813
9.8
CVE-2020-12637
9.8
CVE-2019-18826
9.8
CVE-2020-1952
9.8
CVE-2022-45597
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-20200 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.
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