Out-of-bounds read in libIEC61850 - #VU136971
Published: July 7, 2026
Vulnerability identifier: #VU136971
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in parseUserInformation() when parsing a malformed ACSE AARE PDU during MMS / IEC 61850 association handling. A remote attacker can send a specially crafted AARE PDU to disclose sensitive information.
The out-of-bounds read is a 1-byte heap read and is reachable before authentication.
Affected software
libIEC61850
Remediation
Install security update from vendor's website.
libIEC61850 - update to 1.6.2