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CVE-2015-6409

17
FAUCET Score

CVE-2015-6409 describes a medium-severity vulnerability in Cisco Jabber for Windows (versions 10.6.x, 11.0.x, and 11.1.x) that allows man-in-the-middle attackers to downgrade STARTTLS connections, forcing cleartext XMPP sessions. This attack, with high confidentiality impact, requires a high attack complexity but no user interaction. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
10.6\(2\)CPE matchmatch criteria
cpe:2.3:a:cisco:jabber:10.6\(2\):*:*:*:*:windows:*:*

CVSS Data

CVSS version used by this source: 3.0

5.9MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.34%
Probability of exploitation in next 30 days
EPSS Percentile
68.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0134 is in the 38th 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

Vendor Patches (1)

ciscovendor investigatingvia nvd_reference
View patch

References

tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-20151224-jab
Vendor Advisory
securityfocus.com / bid/79678
securitytracker.com / id/1034540
synacktiv.com / ressources/cisco_jabber_starttls_downgrade.pdf
Third Party Advisory