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Xenmobile Server CVE-2020-8253

HIGH
Improper Authentication (CWE-287)
2020-09-18 support@hackerone.com
Authentication Bypass Citrix Xenmobile Server
7.5
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-287
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Authentication mechanism validation
MITRE ATT&CK

2 techniques across 2 tactics: Defense Evasion, Initial Access

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Impact

CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived

A remote attacker could bypass authentication mechanisms to gain unauthorized access by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 1.7% exploitation probability (EPSS)

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AnalysisAI

Improper authentication in Citrix XenMobile Server 10.12 before RP2, Citrix XenMobile Server 10.11 before RP4, Citrix XenMobile Server 10.10 before RP6 and Citrix XenMobile Server before 10.9 RP5. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Implement multi-factor authentication, enforce strong password policies, use proven authentication frameworks.

Affects your stack

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Technical ContextAI · show details

This vulnerability is classified as Improper Authentication (CWE-287), which allows attackers to bypass authentication mechanisms to gain unauthorized access. Improper authentication in Citrix XenMobile Server 10.12 before RP2, Citrix XenMobile Server 10.11 before RP4, Citrix XenMobile Server 10.10 before RP6 and Citrix XenMobile Server before 10.9 RP5 leads to the ability to access sensitive files. Affected products include: Citrix Xenmobile Server. Version information: before 10.9.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

DescriptionNVD

Improper authentication in Citrix XenMobile Server 10.12 before RP2, Citrix XenMobile Server 10.11 before RP4, Citrix XenMobile Server 10.10 before RP6 and Citrix XenMobile Server before 10.9 RP5 leads to the ability to access sensitive files.

Threat Intelligence Overview

EPSS Score
1.7%
Top 25% exploitable
Data Quality
2 sources
Confidence: Low
Citrix NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 1.7%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact· derived
Medium

Priority Score

40
Low Medium High Critical
KEV: 0
EPSS: +2
CVSS: +38
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)NVD

cpe:2.3:a:citrix:xenmobile_server:*:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.9.0:-:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.9.0:rolling_patch1:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.9.0:rolling_patch2:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.9.0:rolling_patch3:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.9.0:rolling_patch4:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.10.0:-:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.10.0:rolling_patch1:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.10.0:rolling_patch2:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.10.0:rolling_patch3:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.10.0:rolling_patch4:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.10.0:rolling_patch5:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.11.0:-:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.11.0:rolling_patch1:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.11.0:rolling_patch2:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.11.0:rolling_patch3:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.12.0:-:*:*:*:*:*:*
cpe:2.3:a:citrix:xenmobile_server:10.12.0:rolling_patch1:*:*:*:*:*:*

More in Xenmobile Server

View all
CVE-2018-10653 CRITICAL POC
9.8 May 23

There is an XML External Entity (XXE) Processing Vulnerability in Citrix XenMobile Server 10.8 before RP2 and 10.7 befor
CVE-2018-18013 HIGH POC
7.8 Oct 24

* Xen Mobile through 10.8.0 includes a service listening on port 5001 within its firewall that accepts unauthenticated i
CVE-2020-8209 HIGH POC
7.5 Aug 17

Improper access control in Citrix XenMobile Server 10.12 before RP2, Citrix XenMobile Server 10.11 before RP4, Citrix Xe
CVE-2020-8212 CRITICAL
9.8 Aug 17

Improper access control in Citrix XenMobile Server 10.12 before RP3, Citrix XenMobile Server 10.11 before RP6, Citrix Xe
CVE-2020-8211 CRITICAL
9.8 Aug 17

Improper input validation in Citrix XenMobile Server 10.12 before RP3, Citrix XenMobile Server 10.11 before RP6, Citrix

CVE-2018-10648 CRITICAL
9.8 May 23

There are Unauthenticated File Upload Vulnerabilities in Citrix XenMobile Server 10.8 before RP2 and 10.7 before RP3. Ra
CVE-2018-18014 MEDIUM POC
4.8 Oct 24

* Lack of authentication in Citrix Xen Mobile through 10.8 allows low-privileged local users to execute system commands

CVE-2018-10654 HIGH
8.1 May 23

There is a Hazelcast Library Java Deserialization Vulnerability in Citrix XenMobile Server 10.8 before RP2 and 10.7 befo
CVE-2018-10650 HIGH
7.8 May 23

There is an Insufficient Path Validation Vulnerability in Citrix XenMobile Server 10.8 before RP2 and 10.7 before RP3. R
CVE-2017-9231 HIGH
7.5 Jun 16

XML external entity (XXE) vulnerability in Citrix XenMobile Server 9.x and 10.x before 10.5 RP3 allows attackers to obta
CVE-2020-8210 HIGH
7.5 Aug 17

Insufficient protection of secrets in Citrix XenMobile Server 10.12 before RP3, Citrix XenMobile Server 10.11 before RP6
CVE-2018-10652 HIGH
7.5 May 23

There is a Sensitive Data Leakage issue in Citrix XenMobile Server 10.7 before RP3. Rated high severity (CVSS 7.5), this

Same weakness CWE-287 – Improper Authentication

View all
CVE-2022-40684 CRITICAL POC
9.8
CVE-2025-61882 CRITICAL POC
9.8
CVE-2020-0688 HIGH POC
8.8
CVE-2023-46805 HIGH POC
8.2
CVE-2023-35078 CRITICAL POC
9.8
CVE-2015-1187 CRITICAL POC
9.8
CVE-2024-7593 CRITICAL POC
9.8
CVE-2017-7921 CRITICAL POC
9.8

Same technique Authentication Bypass

View all
CVE-2015-3306 CRITICAL POC
10.0
CVE-2023-22515 CRITICAL POC
9.8
CVE-2012-4681 CRITICAL POC
9.8
CVE-2013-2465 CRITICAL POC
9.8
CVE-2011-3544 CRITICAL POC
9.8
CVE-2024-0012 CRITICAL POC
9.3

References

Advisories & patches
PATCH https://support.citrix.com/article/CTX277457

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