OOB Read CVE-2026-53566 Citrix Secure Access Client for Windows <26.6.1.20
CVE-2026-53566 Published on July 14, 2026
Out-of-bounds memory read
Out-of-bounds read vulnerability in Citrix Citrix Secure Access Client for Windows.
This issue affects Citrix Secure Access Client for Windows: before 26.6.1.20.
Vulnerability Analysis
CVE-2026-53566 is exploitable with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
Out-of-bounds Read
The software reads data past the end, or before the beginning, of the intended buffer. Typically, this can allow attackers to read sensitive information from other memory locations or cause a crash. A crash can occur when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string. The expected sentinel might not be located in the out-of-bounds memory, causing excessive data to be read, leading to a segmentation fault or a buffer overflow. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent read operation then produces undefined or unexpected results.
Products Associated with CVE-2026-53566
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Affected Versions
Citrix Secure Access Client for Windows:- Before 26.6.1.20 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.