CVE-2017-17549

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Summary

CVECVE-2017-17549
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2017-12-13 16:29:00 UTC
Updated2025-04-20 01:37:25 UTC
DescriptionCitrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway 10.5 before build 67.13, 11.0 before build 71.22, 11.1 before build 56.19, and 12.0 before build 53.22 allow remote attackers to obtain sensitive information from the backend client TLS handshake by leveraging use of TLS with Client Certificates and a Diffie-Hellman Ephemeral (DHE) key exchange.

Risk And Classification

Primary CVSS: v3.0 5.9 MEDIUM from [email protected]

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

EPSS: 0.006380000 probability, percentile 0.707120000 (date 2026-05-18)

Problem Types: CWE-200 | n/a

VersionSourceTypeScoreSeverityVector
3.0[email protected]Primary5.9MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
2.0[email protected]Primary4.3AV:N/AC:M/Au:N/C:P/I:N/A:N

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Citrix Application Delivery Controller Firmware 10.5 All All All
Operating System Citrix Application Delivery Controller Firmware 11.0 All All All
Operating System Citrix Application Delivery Controller Firmware 11.1 All All All
Operating System Citrix Application Delivery Controller Firmware 12.0 All All All
Operating System Citrix Netscaler Gateway Firmware 10.5 All All All
Operating System Citrix Netscaler Gateway Firmware 11.0 All All All
Operating System Citrix Netscaler Gateway Firmware 11.1 All All All
Operating System Citrix Netscaler Gateway Firmware 12.0 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
Information Disclosure in Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway Client TLS Handshake af854a3a-2127-422b-91ae-364da2661108 support.citrix.com Vendor Advisory
Multiple Citrix Products CVE-2017-17549 Information Disclosure Vulnerability af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com Third Party Advisory, VDB Entry
Citrix NetScaler ADC and Gateway Packet Engine TLS Handshake Flaw Lets Remote Users Obtain Cleartext in Certain Cases - SecurityTracker af854a3a-2127-422b-91ae-364da2661108 www.securitytracker.com Third Party Advisory, VDB Entry
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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