CVE-2017-12871: Simplesamlphp

Medium severity, CVSS 5.9. EPSS: 0.5% chance of exploitation in the next 30 days.

The aesEncrypt method in lib/SimpleSAML/Utils/Crypto.php in SimpleSAMLphp 1.14.x through 1.14.11 makes it easier for context-dependent attackers to bypass the encryption protection mechanism by leveraging use of the first 16 bytes of the secret key as the initialization vector (IV).

Affected products

• Simplesamlphp Simplesamlphp: version 1.14.0 only; version 1.14.1 only; version 1.14.2 only; version 1.14.3 only; version 1.14.4 only; version 1.14.5 only; …

Published 2017-09-01. Last modified 2026-06-17.