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CVE-2021-44520

31
FAUCET Score

CVE-2021-44520 is an authenticated command injection vulnerability affecting Citrix XenMobile Server through version 10.12 RP9, allowing remote code execution with root privileges. This high-severity flaw (CVSS 8.8) can be exploited remotely with low complexity and low privileges, leading to complete compromise of confidentiality, integrity, and availability. While not listed in CISA's KEV catalog, its high EPSS and FAUCET scores indicate significant potential risk, despite the absence of public exploit code and limited community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
10.13.0CPE matchmatch criteria
cpe:2.3:a:citrix:xenmobile_server:10.13.0:-:*:*:*:*:*:*
10.13.0CPE matchmatch criteria
cpe:2.3:a:citrix:xenmobile_server:10.13.0:rolling_patch_3:*:*:*:*:*:*
10.13.0CPE matchmatch criteria
cpe:2.3:a:citrix:xenmobile_server:10.13.0:rolling_patch_4:*:*:*:*:*:*
10.13.0CPE matchmatch criteria
cpe:2.3:a:citrix:xenmobile_server:10.13.0:rolling_patch_5:*:*:*:*:*:*
10.13.0CPE matchmatch criteria
cpe:2.3:a:citrix:xenmobile_server:10.13.0:rolling_patch_6:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
5.80%
Probability of exploitation in next 30 days
EPSS Percentile
92.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0580 is in the 92nd percentile among its peer group of 17,823 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

citrixvendor investigatingvia nvd_reference
View patch

References

docs.citrix.com / en-us/xenmobile/server/document-history.html
Vendor Advisory
gist.github.com / tree-chtsec/766f81e22ae383987d75eedb3b23b709
Third Party Advisory
support.citrix.com / article/CTX370551
Vendor Advisory
chtsecurity.com / news/09be10ae-b50e-46c9-8ce7-2e995fd988fe