Vulnerability
curl/libcurl: curl escape and unescape integer overflows
The four libcurl functions `curl_escape()`, `curl_easy_escape()`, `curl_unescape` and `curl_easy_unescape` perform string URL percent escaping and unescaping. They accept custom string length inputs in signed integer arguments. (The functions having names without "easy" being the deprecated versions of the others.) The provided string length arguments were not properly checked and due to arithmetic in the functions, passing in the length `0xffffffff` (2^32-1 or `UINT_MAX` or even -1) would end up causing an allocation of zero bytes of heap memory that curl would attempt to write gigabytes of data into. The use of 'int' for this input type in the API is of course unwise but has remained so in order to maintain the API over the years.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HMid-pack — moderate exploitation likelihood.
No VEX statements published for CVE-2016-7167. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.
Total impact on non-trivial mission systems