{"id":"ALPINE-CVE-2020-25683","details":"A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. A remote attacker, who can create valid DNS replies, could use this flaw to cause an overflow in a heap-allocated memory. This flaw is caused by the lack of length checks in rfc1035.c:extract_name(), which could be abused to make the code execute memcpy() with a negative size in get_rdata() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability.","modified":"2025-12-03T22:47:00.524395Z","published":"2021-01-20T16:15:14.087Z","upstream":["CVE-2020-25683"],"references":[{"type":"ADVISORY","url":"https://security.alpinelinux.org/vuln/CVE-2020-25683"}],"affected":[{"package":{"name":"dnsmasq","ecosystem":"Alpine:v3.10","purl":"pkg:apk/alpine/dnsmasq?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.83-r0"}]}],"versions":["2.46-r0","2.47-r0","2.49-r0","2.50-r0","2.50-r1","2.51-r0","2.52-r0","2.52-r1","2.55-r0","2.57-r0","2.58-r0","2.59-r0","2.59-r1","2.60-r0","2.61-r0","2.62-r0","2.63-r0","2.64-r0","2.65-r0","2.66-r0","2.66-r1","2.66-r2","2.67-r0","2.68-r0","2.69-r0","2.70-r0","2.71-r0","2.72-r0","2.72-r1","2.73-r0","2.75-r0","2.75-r1","2.75-r2","2.76-r0","2.76-r1","2.76-r2","2.76-r3","2.76-r4","2.77-r0","2.78-r0","2.78-r1","2.78-r2","2.79-r0","2.79-r1","2.79-r2","2.80-r0","2.80-r1","2.80-r2","2.80-r3","2.80-r4"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-25683.json"}},{"package":{"name":"dnsmasq","ecosystem":"Alpine:v3.11","purl":"pkg:apk/alpine/dnsmasq?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.83-r0"}]}],"versions":["2.46-r0","2.47-r0","2.49-r0","2.50-r0","2.50-r1","2.51-r0","2.52-r0","2.52-r1","2.55-r0","2.57-r0","2.58-r0","2.59-r0","2.59-r1","2.60-r0","2.61-r0","2.62-r0","2.63-r0","2.64-r0","2.65-r0","2.66-r0","2.66-r1","2.66-r2","2.67-r0","2.68-r0","2.69-r0","2.70-r0","2.71-r0","2.72-r0","2.72-r1","2.73-r0","2.75-r0","2.75-r1","2.75-r2","2.76-r0","2.76-r1","2.76-r2","2.76-r3","2.76-r4","2.77-r0","2.78-r0","2.78-r1","2.78-r2","2.79-r0","2.79-r1","2.79-r2","2.80-r0","2.80-r1","2.80-r2","2.80-r3","2.80-r4","2.80-r5"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-25683.json"}},{"package":{"name":"dnsmasq","ecosystem":"Alpine:v3.12","purl":"pkg:apk/alpine/dnsmasq?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.83-r0"}]}],"versions":["2.46-r0","2.47-r0","2.49-r0","2.50-r0","2.50-r1","2.51-r0","2.52-r0","2.52-r1","2.55-r0","2.57-r0","2.58-r0","2.59-r0","2.59-r1","2.60-r0","2.61-r0","2.62-r0","2.63-r0","2.64-r0","2.65-r0","2.66-r0","2.66-r1","2.66-r2","2.67-r0","2.68-r0","2.69-r0","2.70-r0","2.71-r0","2.72-r0","2.72-r1","2.73-r0","2.75-r0","2.75-r1","2.75-r2","2.76-r0","2.76-r1","2.76-r2","2.76-r3","2.76-r4","2.77-r0","2.78-r0","2.78-r1","2.78-r2","2.79-r0","2.79-r1","2.79-r2","2.80-r0","2.80-r1","2.80-r2","2.80-r3","2.80-r4","2.80-r5","2.81-r0"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-25683.json"}},{"package":{"name":"dnsmasq","ecosystem":"Alpine:v3.13","purl":"pkg:apk/alpine/dnsmasq?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.83-r0"}]}],"versions":["2.46-r0","2.47-r0","2.49-r0","2.50-r0","2.50-r1","2.51-r0","2.52-r0","2.52-r1","2.55-r0","2.57-r0","2.58-r0","2.59-r0","2.59-r1","2.60-r0","2.61-r0","2.62-r0","2.63-r0","2.64-r0","2.65-r0","2.66-r0","2.66-r1","2.66-r2","2.67-r0","2.68-r0","2.69-r0","2.70-r0","2.71-r0","2.72-r0","2.72-r1","2.73-r0","2.75-r0","2.75-r1","2.75-r2","2.76-r0","2.76-r1","2.76-r2","2.76-r3","2.76-r4","2.77-r0","2.78-r0","2.78-r1","2.78-r2","2.79-r0","2.79-r1","2.79-r2","2.80-r0","2.80-r1","2.80-r2","2.80-r3","2.80-r4","2.80-r5","2.81-r0","2.81-r1","2.82-r0"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-25683.json"}},{"package":{"name":"dnsmasq","ecosystem":"Alpine:v3.14","purl":"pkg:apk/alpine/dnsmasq?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.83-r0"}]}],"versions":["2.46-r0","2.47-r0","2.49-r0","2.50-r0","2.50-r1","2.51-r0","2.52-r0","2.52-r1","2.55-r0","2.57-r0","2.58-r0","2.59-r0","2.59-r1","2.60-r0","2.61-r0","2.62-r0","2.63-r0","2.64-r0","2.65-r0","2.66-r0","2.66-r1","2.66-r2","2.67-r0","2.68-r0","2.69-r0","2.70-r0","2.71-r0","2.72-r0","2.72-r1","2.73-r0","2.75-r0","2.75-r1","2.75-r2","2.76-r0","2.76-r1","2.76-r2","2.76-r3","2.76-r4","2.77-r0","2.78-r0","2.78-r1","2.78-r2","2.79-r0","2.79-r1","2.79-r2","2.80-r0","2.80-r1","2.80-r2","2.80-r3","2.80-r4","2.80-r5","2.81-r0","2.81-r1","2.82-r0"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-25683.json"}},{"package":{"name":"dnsmasq","ecosystem":"Alpine:v3.15","purl":"pkg:apk/alpine/dnsmasq?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.83-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-25683.json"}},{"package":{"name":"dnsmasq","ecosystem":"Alpine:v3.16","purl":"pkg:apk/alpine/dnsmasq?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{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