{"cve":"CVE-2023-44981","nvd":{"published":"2023-10-11T12:15:11.760","modified":"2026-06-17T06:28:01.130","status":"Modified","description":"Authorization Bypass Through User-Controlled Key vulnerability in Apache ZooKeeper. If SASL Quorum Peer authentication is enabled in ZooKeeper (quorum.auth.enableSasl=true), the authorization is done by verifying that the instance part in SASL authentication ID is listed in zoo.cfg server list. The instance part in SASL auth ID is optional and if it's missing, like 'eve@EXAMPLE.COM', the authorization check will be skipped. As a result an arbitrary endpoint could join the cluster and begin propagating counterfeit changes to the leader, essentially giving it complete read-write access to the data tree. Quorum Peer authentication is not enabled by default.\n\nUsers are recommended to upgrade to version 3.9.1, 3.8.3, 3.7.2, which fixes the issue.\n\nAlternately ensure the ensemble election/quorum communication is protected by a firewall as this will mitigate the issue.\n\nSee the documentation for more details on correct cluster administration.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1},"cwes":["CWE-639"],"references":["http://www.openwall.com/lists/oss-security/2023/10/11/4","https://lists.apache.org/thread/wf0yrk84dg1942z1o74kd8nycg6pgm5b","https://lists.debian.org/debian-lts-announce/2023/10/msg00029.html","https://security.netapp.com/advisory/ntap-20240621-0007/","https://www.debian.org/security/2023/dsa-5544"],"products":["apache:zookeeper","debian:debian_linux"],"source":"nvd","synced_at":"2026-10-19T21:39:34.467980132+00:00"},"epss":{"cve":"CVE-2023-44981","score":0.02221,"percentile":0.82681,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-7286-pgfv-vxvh","url":"https://osv.dev/vulnerability/GHSA-7286-pgfv-vxvh","summary":"Authorization Bypass Through User-Controlled Key vulnerability in Apache ZooKeeper","modified":"2026-09-10T03:49:58.702159798Z","packages":[{"ecosystem":"Maven","name":"org.apache.zookeeper:zookeeper","purl":"pkg:maven/org.apache.zookeeper/zookeeper","ranges":["<3.7.2"],"fixed":["3.7.2"]},{"ecosystem":"Maven","name":"org.apache.zookeeper:zookeeper","purl":"pkg:maven/org.apache.zookeeper/zookeeper","ranges":[">=3.8.0 <3.8.3"],"fixed":["3.8.3"]},{"ecosystem":"Maven","name":"org.apache.zookeeper:zookeeper","purl":"pkg:maven/org.apache.zookeeper/zookeeper","ranges":[">=3.9.0 <3.9.1"],"fixed":["3.9.1"]}]}],"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."]}