CVE-2015-1637 json
Schannel (aka Secure Channel) in Microsoft Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, W…
published 2015-03-06 11 y ago modified 2026-06-17 4 mo ago also EUVD-2015-1767
- cvss
- 4.3
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 13.2%
- EPSS 13.2% chance of exploitation in 30 days, percentile 96%
- public exploits
- 0
- none known
Summary
Schannel (aka Secure Channel) in Microsoft Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT Gold and 8.1 does not properly restrict TLS state transitions, which makes it easier for remote attackers to conduct cipher-downgrade attacks to EXPORT_RSA ciphers via crafted TLS traffic, related to the "FREAK" issue, a different vulnerability than CVE-2015-0204 and CVE-2015-1067.
Patch / fix
Exploit prediction
13.15% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
Classification
- Weakness
-
- CWE-310 Cryptographic Issues
References
-
docs.microsoft.com
/en-us/security-updates/securitybulletins/2015/ms15-031
vendor-advisory, patch
-
technet.microsoft.com
/library/security/3046015
patch, vendor-advisory
-
freakattack.com
/
vendor-advisory
-
securitytracker.com
/id/1031833
vdb-entry, third-party-advisory
-
securityfocus.com
/bid/72965
vdb-entry, third-party-advisory
- web.archive.org /web/20150321220028/https://freakattack.com/
Sources
- CVE List CVE-2015-1637
- NVD CVE-2015-1637
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.