CVE-2021-44520

In Citrix XenMobile Server through 10.12 RP9, there is an Authenticated Command Injection vulnerability, leading to remote code execution with root privileges.

Published: 2022-04-12 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-44520 is rated Moderate Risk (62.4/100): CVSS High severity, with high exploitation likelihood (EPSS 5.63%, 92th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. 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-2021-44520

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 15.84% 5.63% -10.21%
2 2025-12-26 5.94% 15.84% +9.90%
3 2025-11-21 — 5.94% —

Full EPSS history (21 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-44520

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-2021-44520

Affected software / configurations for CVE-2021-44520

Vendor Product Version Raw CPE
citrix xenmobile_server 10.13.0 cpe:2.3:a:citrix:xenmobile_server:10.13.0:-:*:*:*:*:*:*
citrix xenmobile_server 10.13.0 cpe:2.3:a:citrix:xenmobile_server:10.13.0:rolling_patch_3:*:*:*:*:*:*
citrix xenmobile_server 10.13.0 cpe:2.3:a:citrix:xenmobile_server:10.13.0:rolling_patch_4:*:*:*:*:*:*
citrix xenmobile_server 10.13.0 cpe:2.3:a:citrix:xenmobile_server:10.13.0:rolling_patch_5:*:*:*:*:*:*
citrix xenmobile_server 10.13.0 cpe:2.3:a:citrix:xenmobile_server:10.13.0:rolling_patch_6:*:*:*:*:*:*
citrix xenmobile_server 10.14.0 cpe:2.3:a:citrix:xenmobile_server:10.14.0:-:*:*:*:*:*:*
citrix xenmobile_server 10.14.0 cpe:2.3:a:citrix:xenmobile_server:10.14.0:rolling_patch_1:*:*:*:*:*:*
citrix xenmobile_server 10.14.0 cpe:2.3:a:citrix:xenmobile_server:10.14.0:rolling_patch_2:*:*:*:*:*:*
citrix xenmobile_server 10.14.0 cpe:2.3:a:citrix:xenmobile_server:10.14.0:rolling_patch_3:*:*:*:*:*:*

References for CVE-2021-44520

cvelogic Threat Intelligence