A vulnerability has been identified in SIMATIC HMI United Comfort Panels (All versions). Affected devices insufficiently validate authentication attempts as the information given can be truncated to match only a set number of characters versus the whole provided string. This could allow a remote attacker to discover user passwords and obtain access to the Sm@rt Server via a brute-force attack.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-15787
• https://cert-portal.siemens.com/productcert/pdf/ssa-542525.pdf