{"id":"CVE-2021-3121","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-3121","generatedAt":"2026-10-27T23:38:44.648Z","title":"An issue was discovered in GoGo Protobuf before 1.3.2. plugin/unmarshal/unmarshal.go lacks certain index validation, aka the \"skippy peanut butter\" issue.","description":"An issue was discovered in GoGo Protobuf before 1.3.2. plugin/unmarshal/unmarshal.go lacks certain index validation, aka the \"skippy peanut butter\" issue.","published":"2021-01-11T06:15:13.000Z","lastModified":"2026-06-17T04:04:42.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":8.6,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H"},"cwe":["CWE-129"],"affected":["golang/protobuf","hashicorp/consul"],"epss":{"score":0.03425,"percentile":0.88836,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (3.43%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://discuss.hashicorp.com/t/hcsec-2021-23-consul-exposed-to-denial-of-service-in-gogo-protobuf-dependency/29025","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/gogo/protobuf/commit/b03c65ea87cdc3521ede29f62fe3ce239267c1bc","tags":["Patch","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/gogo/protobuf/compare/v1.3.1...v1.3.2","tags":["Patch","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://lists.apache.org/thread.html/r68032132c0399c29d6cdc7bd44918535da54060a10a12b1591328bff%40%3Cnotifications.skywalking.apache.org%3E","source":"cve@mitre.org"},{"url":"https://lists.apache.org/thread.html/r88d69555cb74a129a7bf84838073b61259b4a3830190e05a3b87994e%40%3Ccommits.pulsar.apache.org%3E","source":"cve@mitre.org"},{"url":"https://lists.apache.org/thread.html/rc1e9ff22c5641d73701ba56362fb867d40ed287cca000b131dcf4a44%40%3Ccommits.pulsar.apache.org%3E","source":"cve@mitre.org"},{"url":"https://security.netapp.com/advisory/ntap-20210219-0006/","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://discuss.hashicorp.com/t/hcsec-2021-23-consul-exposed-to-denial-of-service-in-gogo-protobuf-dependency/29025","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/gogo/protobuf/commit/b03c65ea87cdc3521ede29f62fe3ce239267c1bc","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/gogo/protobuf/compare/v1.3.1...v1.3.2","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.apache.org/thread.html/r68032132c0399c29d6cdc7bd44918535da54060a10a12b1591328bff%40%3Cnotifications.skywalking.apache.org%3E","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.apache.org/thread.html/r88d69555cb74a129a7bf84838073b61259b4a3830190e05a3b87994e%40%3Ccommits.pulsar.apache.org%3E","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.apache.org/thread.html/rc1e9ff22c5641d73701ba56362fb867d40ed287cca000b131dcf4a44%40%3Ccommits.pulsar.apache.org%3E","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20210219-0006/","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-3121","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}