How severe is CVE-2021-44520?

CVE-2021-44520 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-44520 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-44520?

CVE-2021-44520 primarily affects Citrix Xenmobile Server. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-44520?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-44520 published?

CVE-2021-44520 was published on 2022-04-13 and last updated on 2026-06-17.

CVE-2021-44520

CVE-2021-44520 is a high-severity vulnerability in Citrix Xenmobile Server with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-77.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
EPSS exploit prediction: 6% (92nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-77
Affected product: Citrix Xenmobile Server
Published: 2022-04-13
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is 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.
How severe is CVE-2021-44520?: CVE-2021-44520 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-44520 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-44520?: CVE-2021-44520 primarily affects Citrix Xenmobile Server. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-44520?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-44520 published?: CVE-2021-44520 was published on 2022-04-13 and last updated on 2026-06-17.

References

Affected products (9)

cpe:2.3:a:citrix:xenmobile_server:10.13.0:-:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.13.0:rolling_patch_3:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.13.0:rolling_patch_4:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.13.0:rolling_patch_5:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.13.0:rolling_patch_6:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.14.0:-:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.14.0:rolling_patch_1:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.14.0:rolling_patch_2:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.14.0:rolling_patch_3:*:*:*:*:*:*

More vulnerabilities in Citrix Xenmobile Server

CVE-2020-8212 — Critical (CVSS 9.8): Improper access control in Citrix XenMobile Server 10.12 before RP3, Citrix XenMobile Server 10.11 before RP6, Citrix…
CVE-2020-8211 — Critical (CVSS 9.8): Improper input validation in Citrix XenMobile Server 10.12 before RP3, Citrix XenMobile Server 10.11 before RP6, Citrix…
CVE-2018-10653 — Critical (CVSS 9.8): There is an XML External Entity (XXE) Processing Vulnerability in Citrix XenMobile Server 10.8 before RP2 and 10.7…
CVE-2018-10648 — Critical (CVSS 9.8): There are Unauthenticated File Upload Vulnerabilities in Citrix XenMobile Server 10.8 before RP2 and 10.7 before RP3.
CVE-2018-18571 — Critical (CVSS 9.1): An Incorrect Access Control vulnerability has been identified in Citrix XenMobile Server 10.8.0 before Rolling Patch 6…
CVE-2021-44519 — High (CVSS 8.8): In Citrix XenMobile Server through 10.12 RP9, there is an Authenticated Directory Traversal vulnerability, leading to…

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