CVE-2007-2850

The Session Reliability Service (XTE) in Citrix MetaFrame Presentation Server 3.0, Presentation Server 4.0, and Access Essentials 1.0 and 1.5, allows remote attackers to bypass network security policies and connect to arbitrary TCP ports via a modified address:port string.

Published: 2007-05-24 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2007-2850 is rated High Risk (72.2/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 3.48%). EPSS rose +1.63% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2007-2850

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-01-10 1.85% 3.48% +1.63%
2 2025-08-08 1.37% 1.85% +0.48%
3 2025-03-30 — 1.37% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2007-2850

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
10.0 2.0 HIGH
AV:N/AC:L/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 10.0 [email protected]

Weakness enumeration for CVE-2007-2850

NVD evaluator notes for CVE-2007-2850

Solution: The vendor has addressed this issue with the following product updates: MetaFrame Presentation Server 3.0 for Windows 2000 Server: EN - http://support.citrix.com/article/CTX112818 FR - http://support.citrix.com/article/CTX112821 DE - http://support.citrix.com/article/CTX112819 JA - http://support.citrix.com/article/CTX112820 ES - http://support.citrix.com/article/CTX112822 MetaFrame Presentation Server 3.0 for Windows Server 2003: EN - http://support.citrix.com/article/CTX112813 FR - http://support.citrix.com/article/CTX112816 DE - http://support.citrix.com/article/CTX112814 JA - http://support.citrix.com/article/CTX112815 ES - http://support.citrix.com/article/CTX112817 Citrix Presentation Server 4.0 for Windows 2000 Server: EN - http://support.citrix.com/article/CTX112844 FR - http://support.citrix.com/article/CTX112847 DE - http://support.citrix.com/article/CTX112845 JA - http://support.citrix.com/article/CTX112848 ES - http://support.citrix.com/article/CTX112846 Citrix Presentation Server 4.0 for Windows Server 2003: EN - http://support.citrix.com/article/CTX112839 FR - http://support.citrix.com/article/CTX112842 DE - http://support.citrix.com/article/CTX112840 JA - http://support.citrix.com/article/CTX112843 ES - http://support.citrix.com/article/CTX112841 Citrix Presentation Server 4.0 for Windows Server 2003 x64 Editions: EN - http://support.citrix.com/article/CTX112886 FR - http://support.citrix.com/article/CTX112887 DE - http://support.citrix.com/article/CTX112888 JA - http://support.citrix.com/article/CTX112890 ES - http://support.citrix.com/article/CTX112889 Citrix Access Essentials 1.0: EN - http://support.citrix.com/article/CTX112839 FR - http://support.citrix.com/article/CTX112842 DE - http://support.citrix.com/article/CTX112840 ES - http://support.citrix.com/article/CTX112841 Citrix Access Essentials 1.5: EN - http://support.citrix.com/article/CTX112839 FR - http://support.citrix.com/article/CTX112842 DE - http://support.citrix.com/article/CTX112840 ES - http://support.citrix.com/article/CTX112841

Affected software / configurations for CVE-2007-2850

Vendor Product Version Raw CPE
citrix access_essentials 1.0 cpe:2.3:a:citrix:access_essentials:1.0:*:*:*:*:*:*:*
citrix access_essentials 1.5 cpe:2.3:a:citrix:access_essentials:1.5:*:*:*:*:*:*:*
citrix metaframe 3.0 cpe:2.3:a:citrix:metaframe:3.0:*:microsoft_windows_2000:*:*:*:*:*
citrix metaframe 3.0 cpe:2.3:a:citrix:metaframe:3.0:*:microsoft_windows_2003:*:*:*:*:*
citrix metaframe 3.0 cpe:2.3:a:citrix:metaframe:3.0:*:x64_edition:*:*:*:*:*
citrix metaframe 4.0 cpe:2.3:a:citrix:metaframe:4.0:*:microsoft_windows_2000:*:*:*:*:*
citrix metaframe 4.0 cpe:2.3:a:citrix:metaframe:4.0:*:microsoft_windows_2003:*:*:*:*:*
citrix metaframe 4.0 cpe:2.3:a:citrix:metaframe:4.0:*:x64_edition:*:*:*:*:*

References for CVE-2007-2850

cvelogic Threat Intelligence