Citrix XenServer 6.0.2/6.2.0/6.5/7.0 Task access control

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability, which was classified as problematic, has been found in Citrix XenServer 6.0.2/6.2.0/6.5/7.0 (Virtualization Software). This issue affects an unknown functionality of the component Task Handler. The manipulation with an unknown input leads to a privilege escalation vulnerability. Using CWE to declare the problem leads to CWE-264. Impacted is availability.

The bug was discovered 01/25/2017. The weakness was released 01/25/2017 as CTX220112 as confirmed security bulletin (Website). The advisory is shared at The identification of this vulnerability is CVE-2017-5573 since 01/23/2017. The attack may be initiated remotely. The successful exploitation needs a simple authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1068 for this issue. The advisory points out:

Several security issues have been identified within Citrix XenServer. These issues could, if exploited, allow an authenticated administrator to perform a denial-of-service attack against the host, even when that administrator has a less-privileged RBAC role (e.g. read-only).

The vulnerability scanner Nessus provides a plugin with the ID 96928 (Citrix XenServer Multiple Vulnerabilities (CTX220112)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc. and running in the context local.

Applying the patch CTX220079/CTX220080/CTX220081 is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at SecurityFocus (BID 95796), SecurityTracker (ID 1037716) and Tenable (96928). Entries connected to this vulnerability are available at 78855 and 96040.





CPE 2.3infoedit

CPE 2.2infoedit


VulDB Meta Base Score: 4.6
VulDB Meta Temp Score: 4.4

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.9
NVD Vector: 🔍



VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍


Class: Privilege escalation
CWE: CWE-264
ATT&CK: T1068

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔍


Nessus ID: 96928
Nessus Name: Citrix XenServer Multiple Vulnerabilities (CTX220112)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 103302
OpenVAS Name: Citrix XenServer Multiple Security Updates (CTX220112)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfoedit

Threat: 🔍
Adversaries: 🔍
Geopolitics: 🔍
Economy: 🔍
Predictions: 🔍
Remediation: 🔍


Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: CTX220079/CTX220080/CTX220081


01/23/2017 🔍
01/25/2017 +2 days 🔍
01/25/2017 +0 days 🔍
01/25/2017 +0 days 🔍
01/25/2017 +0 days 🔍
01/26/2017 +1 days 🔍
01/27/2017 +1 days 🔍
01/27/2017 +0 days 🔍
01/30/2017 +2 days 🔍
02/01/2017 +2 days 🔍



Advisory: CTX220112
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-5573 (🔍)
SecurityFocus: 95796 - Citrix XenServer CVE-2017-5573 Security Bypass Vulnerability
SecurityTracker: 1037716
OSVDB: - CVE-2017-5573 - Citrix - XenServer - Security Bypass Issue

See also: 🔍


Created: 01/27/2017 12:18 PM
Changes: (85) software_type software_vendor software_name software_version software_component vulnerability_discoverydate vulnerability_cwe vulnerability_risk vulnerability_cvss2_vuldb_basescore vulnerability_cvss2_vuldb_tempscore vulnerability_cvss2_vuldb_av vulnerability_cvss2_vuldb_ac vulnerability_cvss2_vuldb_au vulnerability_cvss2_vuldb_ci vulnerability_cvss2_vuldb_ii vulnerability_cvss2_vuldb_ai vulnerability_cvss2_nvd_av vulnerability_cvss2_nvd_ac vulnerability_cvss2_nvd_au vulnerability_cvss2_nvd_ci vulnerability_cvss2_nvd_ii vulnerability_cvss2_nvd_ai vulnerability_cvss3_meta_basescore vulnerability_cvss3_meta_tempscore vulnerability_cvss3_vuldb_basescore vulnerability_cvss3_vuldb_tempscore vulnerability_cvss3_vuldb_av vulnerability_cvss3_vuldb_ac vulnerability_cvss3_vuldb_pr vulnerability_cvss3_vuldb_ui vulnerability_cvss3_vuldb_s vulnerability_cvss3_vuldb_c vulnerability_cvss3_vuldb_i vulnerability_cvss3_vuldb_a vulnerability_cvss3_nvd_av vulnerability_cvss3_nvd_ac vulnerability_cvss3_nvd_pr vulnerability_cvss3_nvd_ui vulnerability_cvss3_nvd_s vulnerability_cvss3_nvd_c vulnerability_cvss3_nvd_i vulnerability_cvss3_nvd_a vulnerability_advisoryquote advisory_date advisory_location advisory_type advisory_url advisory_identifier advisory_confirm_url advisory_disputed exploit_price_0day countermeasure_name countermeasure_date countermeasure_patch_name source_cve source_cve_assigned source_cve_nvd_published source_cve_nvd_summary source_osvdb_title source_securityfocus source_securityfocus_date source_securityfocus_class source_securityfocus_title source_sectracker source_sectracker_date source_sectracker_cause source_nessus_id source_nessus_name source_nessus_filename source_nessus_risk source_nessus_family source_nessus_type source_nessus_date source_openvas_id source_openvas_filename source_openvas_title source_openvas_family source_seealso vulnerability_cvss2_vuldb_e vulnerability_cvss2_vuldb_rl vulnerability_cvss2_vuldb_rc vulnerability_cvss3_vuldb_e vulnerability_cvss3_vuldb_rl vulnerability_cvss3_vuldb_rc vulnerability_cvss3_nvd_basescore
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