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CVE-2015-5639

19
FAUCET Score

CVE-2015-5639 describes a critical vulnerability in the niconico App for iOS versions prior to 6.38, where the application failed to properly verify SSL certificates. This oversight enables remote attackers to conduct man-in-the-middle attacks, potentially compromising the confidentiality and integrity of user data. With a CVSS v3 score of 7.4 (HIGH), the vulnerability is network-exploitable with high impact on confidentiality and integrity, though it requires high attack complexity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 6.37CPE matchmatch criteria
cpe:2.3:a:dwango:niconico:*:*:*:*:*:iphone_os:*:*

CVSS Data

CVSS version used by this source: 3.0

7.4HIGH

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
5.2
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.95%
Probability of exploitation in next 30 days
EPSS Percentile
57.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0095 is in the 23rd percentile among its peer group of 8,914 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 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 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

blog.nicovideo.jp / niconews/ni055746.html
Vendor Advisory
jvndb.jvn.jp / en/contents/2015/JVNDB-2015-000137.html
Third Party AdvisoryVDB Entry
jvn.jp / en/jp/JVN20355129/index.html
Third Party AdvisoryVDB Entry
securityfocus.com / bid/76906
Third Party AdvisoryVDB Entry