An out-of-bounds array read in the apr_time_exp* functions was fixed in the Apache Portable Runtime 1.6.3 release . The fix for this issue was not carried forward to the APR 1.7.x branch, and hence version 1.7.0 regressed compared to 1.6.3 and is vulnerable to the same issue. Integer Overflow or Wraparound vulnerability in apr_base64 functions of Apache Portable Runtime Utility allows an attacker to write beyond bounds of a buffer. This issue affects Apache Portable Runtime Utility 1.6.1 and prior versions