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CVE-2015-1637

18
FAUCET Score

CVE-2015-1637 describes a vulnerability in Microsoft Windows' Schannel (Secure Channel) component across various versions, including Windows 7, 8, and Server editions. This flaw allows remote attackers to conduct cipher-downgrade attacks to weaker EXPORT_RSA ciphers, a technique related to the "FREAK" issue. The vulnerability has a CVSS score of 4.3, indicating a medium attack complexity and potential for integrity impact, but no confidentiality or availability impact. While its FAUCET Risk Score is high at 92/100, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_8:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_rt:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.3MEDIUM

AV:N/AC:M/Au:N/C:N/I:P/A:N

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
13.15%
Probability of exploitation in next 30 days
EPSS Percentile
96.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.1315 is in the 96th percentile among its peer group of 19,958 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

docs.microsoft.com / en-us/security-updates/securitybulletins/2015/ms15-031
PatchVendor Advisory
freakattack.com
Vendor Advisory
technet.microsoft.com / library/security/3046015
PatchVendor Advisory
web.archive.org / web/20150321220028/https://freakattack.com
securityfocus.com / bid/72965
Third Party AdvisoryVDB Entry
securitytracker.com / id/1031833
Third Party AdvisoryVDB Entry