{"cve":"CVE-2020-8617","nvd":{"published":"2020-05-19T14:15:11.987","modified":"2026-06-17T03:26:39.113","status":"Modified","description":"Using a specially-crafted message, an attacker may potentially cause a BIND server to reach an inconsistent state if the attacker knows (or successfully guesses) the name of a TSIG key used by the server. Since BIND, by default, configures a local session key even on servers whose configuration does not otherwise make use of it, almost all current BIND servers are vulnerable. In releases of BIND dating from March 2018 and after, an assertion check in tsig.c detects this inconsistent state and deliberately exits. Prior to the introduction of the check the server would continue operating in an inconsistent state, with potentially harmful results.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9},"cwes":["CWE-617"],"references":["http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html","http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html","http://packetstormsecurity.com/files/157836/BIND-TSIG-Denial-Of-Service.html","http://www.openwall.com/lists/oss-security/2020/05/19/4","https://kb.isc.org/docs/cve-2020-8617"],"products":["canonical:ubuntu_linux","debian:debian_linux","fedoraproject:fedora","isc:bind","opensuse:leap"],"source":"nvd","synced_at":"2026-10-19T21:05:42.039641217+00:00"},"epss":{"cve":"CVE-2020-8617","score":0.93332,"percentile":0.99837,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}