CVE-2017-11343: Call-Cc Chicken

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

Due to an incomplete fix for CVE-2012-6125, all versions of CHICKEN Scheme up to and including 4.12.0 are vulnerable to an algorithmic complexity attack. An attacker can provide crafted input which, when inserted into the symbol table, will result in O(n) lookup time.

Affected products

• Call-Cc Chicken: up to and including 4.12.0

Published 2017-07-17. Last modified 2026-06-17.