An out-of-bounds array read in the apr_time_exp*() functions was fixed in the Apache Portable Runtime 1.6.3 release (CVE-2017-12613). 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.

MISC:http://mail-archives.apache.org/mod_mbox/www-announce/201710.mbox/%3CCACsi251B8UaLvM-rrH9fv57-zWi0zhyF3275_jPg1a9VEVVoxw@mail.gmail.com%3E | URL:http://mail-archives.apache.org/mod_mbox/www-announce/201710.mbox/%3CCACsi251B8UaLvM-rrH9fv57-zWi0zhyF3275_jPg1a9VEVVoxw@mail.gmail.com%3E | MISC:http://svn.apache.org/viewvc?view=revision&revision=1891198 | URL:http://svn.apache.org/viewvc?view=revision&revision=1891198 | MISC:https://dist.apache.org/repos/dist/release/apr/patches/apr-1.7.0-CVE-2021-35940.patch | URL:https://dist.apache.org/repos/dist/release/apr/patches/apr-1.7.0-CVE-2021-35940.patch | MISC:https://lists.apache.org/thread.html/ra2868b53339a6af65577146ad87016368c138388b09bff9d2860f50e%40%3Cdev.apr.apache.org%3E | URL:https://lists.apache.org/thread.html/ra2868b53339a6af65577146ad87016368c138388b09bff9d2860f50e%40%3Cdev.apr.apache.org%3E | MISC:https://www.oracle.com/security-alerts/cpujul2022.html | URL:https://www.oracle.com/security-alerts/cpujul2022.html | MLIST:[announce] 20210823 CVE-2021-35940: Apache Portable Runtime (APR): Regression of CVE-2017-12613 | URL:https://lists.apache.org/thread.html/rb1f3c85f50fbd924a0051675118d1609e57957a02ece7facb723155b@%3Cannounce.apache.org%3E | MLIST:[apr-dev] 20210823 CVE-2021-35940: Apache Portable Runtime (APR): Regression of CVE-2017-12613 | URL:https://lists.apache.org/thread.html/ra2868b53339a6af65577146ad87016368c138388b09bff9d2860f50e@%3Cdev.apr.apache.org%3E | MLIST:[apr-dev] 20210831 APR 1.7.1 release? | URL:https://lists.apache.org/thread.html/r7bb4a6ed88fc48152174e664aae30ea9a8b058eb5b44cf08cb9beb4b@%3Cdev.apr.apache.org%3E | MLIST:[apr-dev] 20210831 Re: APR 1.7.1 release? | URL:https://lists.apache.org/thread.html/r72a069753b9363c29732e59ad8f0d22a633fb6a699980407511ac961@%3Cdev.apr.apache.org%3E | MLIST:[apr-dev] 20210901 Re: APR 1.7.1 release? | URL:https://lists.apache.org/thread.html/r317c398ee5736e627f7887b06607e5c58b45a696d352ba8c14615f55@%3Cdev.apr.apache.org%3E | MLIST:[apr-dev] 20210916 Re: CVE-2021-35940: Apache Portable Runtime (APR): Regression of CVE-2017-12613 | URL:https://lists.apache.org/thread.html/ra38094406cc38a05218ebd1158187feda021b0c3a1df400bbf296af8@%3Cdev.apr.apache.org%3E | MLIST:[httpd-dev] 20210831 APR 1.7.1 release? | URL:https://lists.apache.org/thread.html/r7bb4a6ed88fc48152174e664aae30ea9a8b058eb5b44cf08cb9beb4b@%3Cdev.httpd.apache.org%3E | MLIST:[oss-security] 20210823 CVE-2021-35940: Apache Portable Runtime (APR): Regression of CVE-2017-12613 | URL:http://www.openwall.com/lists/oss-security/2021/08/23/1 | MLIST:[tomcat-dev] 20210922 [jira] [Commented] (MTOMCAT-327) Tomcat 9.0.50 and it has apr-1.7.0 dependency, with Address CVE-2021-35940 | URL:https://lists.apache.org/thread.html/rafe54755850e93de287c36540972457b2dd86332106aa7817c7c27fb@%3Cdev.tomcat.apache.org%3E | MLIST:[tomcat-dev] 20210922 [jira] [Created] (MTOMCAT-327) Tomcat 9.0.50 and it has apr-1.7.0 dependency, with Address CVE-2021-35940 | URL:https://lists.apache.org/thread.html/r72479f4dcffaa8a4732d5a0e87fecc4bace4932e28fc26f7d400e2b3@%3Cdev.tomcat.apache.org%3E | MLIST:[tomcat-dev] 20210922 [jira] [Reopened] (MTOMCAT-327) Tomcat 9.0.50 and it has apr-1.7.0 dependency, with Address CVE-2021-35940 | URL:https://lists.apache.org/thread.html/r1c788464a25fbc046a72aff451bc8186386315d92a2dd0349903fa4f@%3Cdev.tomcat.apache.org%3E | MLIST:[tomcat-dev] 20210922 [jira] [Resolved] (MTOMCAT-327) Tomcat 9.0.50 and it has apr-1.7.0 dependency, with Address CVE-2021-35940 | URL:https://lists.apache.org/thread.html/r54c755c74b9e3846cfd84039b1967d37d2870750a02d7c603983f6ed@%3Cdev.tomcat.apache.org%3E