CVE-2020-8283

An authorised user on a Windows host running Citrix Universal Print Server can perform arbitrary command execution as SYSTEM in CVAD versions before 2009, 1912 LTSR CU1 hotfixes CTX285870 and CTX286120, 7.15 LTSR CU6 hotfix CTX285344 and 7.6 LTSR CU9.

Published: 2020-12-14 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-8283 is rated High Risk (66.4/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.57%). EPSS rose +2.16% 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-2020-8283

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 2026-06-15 0.41% 2.57% +2.16%
2 2026-06-13 0.55% 0.41% -0.14%
3 2026-06-06 — 0.55% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-8283

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
9.0 2.0 HIGH
AV:N/AC:L/Au:S/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:S)
A single authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.0 10.0 [email protected]

Weakness enumeration for CVE-2020-8283

Affected software / configurations for CVE-2020-8283

Vendor Product Version Raw CPE
citrix virtual_apps_and_desktops <= 2006 cpe:2.3:a:citrix:virtual_apps_and_desktops:*:*:*:*:-:*:*:*
citrix virtual_apps_and_desktops >= 1903, <= 1912 cpe:2.3:a:citrix:virtual_apps_and_desktops:*:*:*:*:ltsr:*:*:*
citrix xenapp < 7.6 cpe:2.3:a:citrix:xenapp:*:*:*:*:ltsr:*:*:*
citrix xenapp >= 7.7, < 7.15 cpe:2.3:a:citrix:xenapp:*:*:*:*:ltsr:*:*:*
citrix xenapp 7.6 cpe:2.3:a:citrix:xenapp:7.6:-:*:*:ltsr:*:*:*
citrix xenapp 7.6 cpe:2.3:a:citrix:xenapp:7.6:cu8:*:*:ltsr:*:*:*
citrix xenapp 7.15 cpe:2.3:a:citrix:xenapp:7.15:-:*:*:ltsr:*:*:*
citrix xenapp 7.15 cpe:2.3:a:citrix:xenapp:7.15:cu6:*:*:ltsr:*:*:*
citrix xendesktop < 7.6 cpe:2.3:a:citrix:xendesktop:*:*:*:*:ltsr:*:*:*
citrix xendesktop >= 7.7, < 7.15 cpe:2.3:a:citrix:xendesktop:*:*:*:*:ltsr:*:*:*
citrix xendesktop 7.6 cpe:2.3:a:citrix:xendesktop:7.6:-:*:*:ltsr:*:*:*
citrix xendesktop 7.6 cpe:2.3:a:citrix:xendesktop:7.6:cu8:*:*:ltsr:*:*:*
citrix xendesktop 7.15 cpe:2.3:a:citrix:xendesktop:7.15:-:*:*:ltsr:*:*:*
citrix xendesktop 7.15 cpe:2.3:a:citrix:xendesktop:7.15:cu6:*:*:ltsr:*:*:*

References for CVE-2020-8283

cvelogic Threat Intelligence