5.9

CVE-2016-2402: squareup okhttp Improper Certificate Validation

Modified
AliasesGHSA-4hc2-jh7r-wrc3
Published 30-01-2017Last modified 05-08-2024

Vulnerability summary

CVE-2016-2402 is a medium (CVSS 5.9) Improper Certificate Validation vulnerability in squareup okhttp. EPSS estimates a 1.94% chance of exploitation in the next 30 days, higher than 80.1% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.9, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.9/10
010
Medium · v3.1 (NVD)
EPSS score
1.94%
0%100%
Low · -0.31 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 30-01-2017
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.94%

Chance of exploitation in the next 30 days

Percentile

80%

Versus all other CVEs

30-day change

Decrease -0.31 pp

From 2.25% on 05-10-2026

05-10-202604-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Squareup2 products
Com.squareup.okhttp31 product
  • okhttp< 2.7.4 | ≥ 3.0.0, < 3.1.2

2 vendors · 3 products

References

10 links