How severe is CVE-2016-2402?

CVE-2016-2402 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2016-2402 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-2402?

CVE-2016-2402 primarily affects Squareup Okhttp. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-2402?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2016-2402 published?

CVE-2016-2402 was published on 2017-01-30 and last updated on 2026-06-17.

CVE-2016-2402

CVE-2016-2402 is a medium-severity vulnerability in Squareup Okhttp with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-295.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-295
Affected product: Squareup Okhttp
Published: 2017-01-30
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2016-2402?: CVE-2016-2402 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2016-2402 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-2402?: CVE-2016-2402 primarily affects Squareup Okhttp. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-2402?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-2402 published?: CVE-2016-2402 was published on 2017-01-30 and last updated on 2026-06-17.

References

Affected products (6)

cpe:2.3:a:squareup:okhttp:*:*:*:*:*:*:*:*
cpe:2.3:a:squareup:okhttp3:3.0.0:*:*:*:*:*:*:*
cpe:2.3:a:squareup:okhttp3:3.0.0:rc1:*:*:*:*:*:*
cpe:2.3:a:squareup:okhttp3:3.0.1:*:*:*:*:*:*:*
cpe:2.3:a:squareup:okhttp3:3.1.0:*:*:*:*:*:*:*
cpe:2.3:a:squareup:okhttp3:3.1.1:*:*:*:*:*:*:*

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