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An issue was discovered in Embedthis GoAhead before 4.0.1 and Appweb before 7.0.2. The server mishandles some HTTP request fields associated with time, which results in a NULL pointer dereference, as demonstrated by If-Modified-Since or If-Unmodified-Since with a month greater than 11.
Use CWE-476, Embedthis vendor hub and Appweb product page to widen CVE-2018-15504 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2018-8715, CVE-2021-33254 and CVE-2020-15689 for nearby disclosures in the same product family.