Citrix StoreFront Server XML External Entity (XXE) Processing Vulnerability

Critical Threat Advisory: This vulnerability is documented in active Ransomware campaigns. Immediate remediation required.

Technical Severity

CVSS v3.1 Metrics

HIGH

7.5 / 10

Minimal Risk Critical

Vector Specification

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

Exploitation Likelihood

EPSS Prediction

75.37 %

Predictive Probability

Percentile Rank

98.9 th

Documented as more likely to be exploited than 98.9% of known CVEs.

Detection Date

Nov 03, 2021

Remediation Due

May 03, 2022

CISA Catalog Active

Threat Analysis

Citrix StoreFront Server contains an XML External Entity (XXE) processing vulnerability that may allow an unauthenticated attacker to retrieve potentially sensitive information.

Remediation Directive

Apply updates per vendor instructions.

Asset Context

Vendor Identity

Citrix

Affected Product

StoreFront Server

Ransomware Status

Campaign Use Known

Weakness Classification

CWE-611

External Intelligence

NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2019-13608