VDB-131101 · CVE-2019-6485 · BID 106783

Citrix Netscaler Gateway/Application Delivery Controller Bleichenbacher information disclosure

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability was found in Citrix Netscaler Gateway and Application Delivery Controller (Network Management Software) (unknown version). It has been declared as critical. Affected by this vulnerability is an unknown code block. The manipulation with an unknown input leads to a information disclosure vulnerability (Bleichenbacher). The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Citrix NetScaler Gateway 12.1 before build 50.31, 12.0 before build 60.9, 11.1 before build 60.14, 11.0 before build 72.17, and 10.5 before build 69.5 and Application Delivery Controller (ADC) 12.1 before build 50.31, 12.0 before build 60.9, 11.1 before build 60.14, 11.0 before build 72.17, and 10.5 before build 69.5 allow remote attackers to obtain sensitive plaintext information because of a TLS Padding Oracle Vulnerability when CBC-based cipher suites are enabled.

The bug was discovered 01/23/2019. The weakness was released 02/22/2019 (Website). The advisory is shared at securityfocus.com. This vulnerability is known as CVE-2019-6485 since 01/18/2019. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 121472 (Citrix NetScaler Gateway TLS Padding Oracle Vulnerability (CTX240139)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CGI abuses and running in the context c. The commercial vulnerability scanner Qualys is able to test this issue with plugin 371595 (Citrix ADC And NetScaler Gateway TLS Padding Oracle Vulnerability(CTX240139)).

Upgrading eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (121472). Entry connected to this vulnerability is available at VDB-135310.






CPE 2.3info

CPE 2.2info


VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
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VulDB Meta Base Score: 6.6
VulDB Meta Temp Score: 6.5

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
NVD Vector: 🔍



VulDB Base Score: 🔍
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Name: Bleichenbacher
Class: Information disclosure / Bleichenbacher
CWE: CWE-200 / CWE-284 / CWE-266

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Nessus ID: 121472
Nessus Name: Citrix NetScaler Gateway TLS Padding Oracle Vulnerability (CTX240139)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
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Threat Intelligenceinfo

Interest: 🔍
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Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍


01/18/2019 🔍
01/23/2019 +5 days 🔍
01/23/2019 +0 days 🔍
01/30/2019 +7 days 🔍
02/22/2019 +23 days 🔍
02/23/2019 +1 days 🔍
07/19/2023 +1607 days 🔍


Vendor: citrix.com

Advisory: securityfocus.com
Status: Not defined

CVE: CVE-2019-6485 (🔍)
SecurityFocus: 106783

See also: 🔍


Created: 02/23/2019 07:55 AM
Updated: 07/19/2023 08:44 AM
Changes: 02/23/2019 07:55 AM (65), 05/12/2020 09:32 AM (2), 07/19/2023 08:44 AM (4)
Complete: 🔍
Cache ID: 44:94A:40


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