Access of Memory Location After End of Buffer in SIMOTICS CONNECT 400 - CVE-2021-25677
Published: April 14, 2021 / Updated: April 15, 2021
Vulnerability identifier: #VU52203
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-25677
CWE-ID: CWE-788
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to the DNS client does not properly randomize DNS transaction IDs. A remote attacker can poison the DNS cache or spoof DNS resolving.
Affected software
SIMOTICS CONNECT 400
VSTAR
Nucleus Source Code
Nucleus ReadyStart
Nucleus RTOS
Nucleus NET
Nucleus 4
VSTAR
Nucleus Source Code
Nucleus ReadyStart
Nucleus RTOS
Nucleus NET
Nucleus 4
How to mitigate CVE-2021-25677
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.
Nucleus 4 - update to 4.1.0