  Vulnerability identification constitutes a task of high importance for cyber
security. It is quite helpful for locating and fixing vulnerable functions in
large applications. However, this task is rather challenging owing to the
absence of reliable and adequately managed datasets and learning models.
Existing solutions typically rely on human expertise to annotate datasets or
specify features, which is prone to error. In addition, the learning models
have a high rate of false positives. To bridge this gap, in this paper, we
present a properly curated C/C++ source code vulnerability dataset, denoted as
CVEFunctionGraphEmbeddings (CVEFGE), to aid in developing models. CVEFGE is
automatically crawled from the CVE database, which contains authentic and
publicly disclosed source code vulnerabilities. We also propose a learning
framework based on graph neural networks, denoted SEquential Graph Neural
Network (SEGNN) for learning a large number of code semantic representations.
SEGNN consists of a sequential learning module, graph convolution, pooling, and
fully connected layers. Our evaluations on two datasets and four baseline
methods in a graph classification setting demonstrate state-of-the-art results.
