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In September 2018, an anonymous party discovered and reported an invalid-block denial-of-server vulnerability to developers of Bitcoin Core, Bitcoin ABC and Bitcoin Unlimited. Further analysis by bitcoin developers showed the issue could also allow the creation of blocks violating the 21 million coin limit and CVE-. mw-parser-output cite. citation{font-style:inherit}. mw-parser-output . citation q{quotes:"\"""\"""'""'"}. mw-parser-output . id-lock-free a,. mw-parser-output . citation . cs1-lock-free a{background:linear-gradient(transparent,transparent),url("//upload. wikimedia. org/wikipedia/commons/6/65/Lock-green. svg")right 0. 1em center/9px no-repeat}. mw-parser-output . id-lock-limited a,. mw-parser-output . id-lock-registration a,. mw-parser-output . citation . cs1-lock-limited a,. mw-parser-output . citation . cs1-lock-registration a{background:linear-gradient(transparent,transparent),url("//upload. wikimedia. org/wikipedia/commons/d/d6/Lock-gray-alt-2. svg")right 0. 1em center/9px no-repeat}. mw-parser-output . id-lock-subscription a,. mw-parser-output . citation . cs1-lock-subscription a{background:linear-gradient(transparent,transparent),url("//upload. wikimedia. org/wikipedia/commons/a/aa/Lock-red-alt-2. svg")right 0. 1em center/9px no-repeat}. mw-parser-output . cs1-subscription,. mw-parser-output . cs1-registration{color:#555}. mw-parser-output . cs1-subscription span,. mw-parser-output . cs1-registration span{border-bottom:1px dotted;cursor:help}. mw-parser-output . cs1-ws-icon a{background:linear-gradient(transparent,transparent),url("//upload. wikimedia. org/wikipedia/commons/4/4c/Wikisource-logo. svg")right 0. 1em center/12px no-repeat}. mw-parser-output code. cs1-code{color:inherit;background:inherit;border:none;padding:inherit}. mw-parser-output . cs1-hidden-error{display:none;font-size:100%}. mw-parser-output . cs1-visible-error{font-size:100%}. mw-parser-output . cs1-maint{display:none;color:#33aa33;margin-left:0. 3em}. mw-parser-output . cs1-subscription,. mw-parser-output . cs1-registration,. mw-parser-output . cs1-format{font-size:95%}. mw-parser-output . cs1-kern-left,. mw-parser-output . cs1-kern-wl-left{padding-left:0. 2em}. mw-parser-output . cs1-kern-right,. mw-parser-output . cs1-kern-wl-right{padding-right:0. 2em}. mw-parser-output . citation . mw-selflink{font-weight:inherit}2018-17144 was assigned and the issue resolved. [72][non-primary source needed]