According to the C++ Standard, [intro.scope], paragraph 2 [ISO/IEC 14882-2014]:
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Because C++ is based on the C programming language, there is considerable overlap between the guidelines specified by the SEI CERT C Coding Standard and those specified by this coding standard. To reduce the amount of duplicated information, this coding standard focuses on the parts of the C++ programming language that are not wholly covered by the CERT C Coding Standard. Because of C++'s increased focus on types, some rules in C are extended by the CERT C++ Secure Coding Standard. Except where noted, the contents of the CERT C Coding Standard apply equally to code written in C++.
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