{"id":"CVE-2025-30156","title":"Ceph is an open-source distributed storage platform providing object, block, and file storage","summary":"Ceph is an open-source distributed storage platform providing object, block, and file storage. In versions prior to 20.2.4 and 19.2.6, the CephX authentication protocol encrypts tickets with AES-128-CBC in an unauthenticated mode that us…","severity":"high","cvss":8.9,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L","cwe":["CWE-327","CWE-1204"],"published":"2026-08-28","updated":"2026-09-08","sourceUpdated":"2026-09-08T21:11:56.250","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-30156","references":[{"url":"https://github.com/ceph/ceph/commit/2ba086255de09c8b95177717cc7e9dd4377e2f0f","label":"security-advisories@github.com"},{"url":"https://github.com/ceph/ceph/commit/3078188a7bdd89e2975280f2a906c71c2f6effd6","label":"security-advisories@github.com"},{"url":"https://github.com/ceph/ceph/security/advisories/GHSA-7q3q-3975-qw3q","label":"security-advisories@github.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-30156.json"},{"url":"https://access.redhat.com/security/cve/CVE-2025-30156"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2393864"},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-30156"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-30156"},{"url":"https://access.redhat.com/errata/RHSA-2026:18134"},{"url":"https://access.redhat.com/errata/RHSA-2026:18587"}],"tags":["nvd","csaf","vex","red-hat"],"epss":0.00093,"epssPercentile":0.00643,"ingestedAt":"2026-09-08T22:12:30.941Z","vendor":"Red Hat","product":"Red Hat Enterprise Linux BaseOS (v. 10)","affected":["ceph_storage 7","ceph_storage 8","enterprise_linux 8","openshift_data_foundation 4","enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_9","enterprise_linux_baseos_v_10","enterprise_linux_baseos_v_9","enterprise_linux_codeready_linux_builder_v_10","enterprise_linux_codeready_linux_builder_v_9","enterprise_linux_real_time_for_nfv_v_10","enterprise_linux_real_time_for_nfv_v_9","enterprise_linux_real_time_v_10","enterprise_linux_real_time_v_9"],"patched":["enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_9","enterprise_linux_baseos_v_10","enterprise_linux_baseos_v_9","enterprise_linux_codeready_linux_builder_v_10","enterprise_linux_codeready_linux_builder_v_9","enterprise_linux_real_time_for_nfv_v_10","enterprise_linux_real_time_for_nfv_v_9","enterprise_linux_real_time_v_10","enterprise_linux_real_time_v_9"],"scores":{"nvd":8.9,"vendor":8.7},"slug":"CVE-2025-30156","body":"## Overview\n\nCeph is an open-source distributed storage platform providing object, block, and file storage. In versions prior to 20.2.4 and 19.2.6, the CephX authentication protocol encrypts tickets with AES-128-CBC in an unauthenticated mode that uses a hard-coded initialization vector and no message authentication, allowing an attacker to forge credentials and gain cluster-wide access. Because the ciphertext is malleable and the monitor will encrypt attacker-chosen entity names, an attacker holding one low-privilege key and able to observe CephX traffic can use the monitor as an encryption oracle and splice ciphertext blocks into valid tickets for privileged entities such as Manager, MDS, and OSD. The same lack of authentication also lets an attacker with CephX permissions escalate privileges by flipping a single bit in a service ticket to set its allow_all field to true. This issue is fixed in versions 20.2.4 and 19.2.6.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:18134** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10), Red Hat Enterprise Linux Real Time (v. 10) · released 2026-05-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:18134)\n- **RHSA-2026:18587** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9), Red Hat Enterprise Linux Real Time (v. 9) · released 2026-05-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:18587)\n- **Red Hat VEX** · Important · affected: Red Hat Ceph Storage 7, Red Hat Ceph Storage 8, Red Hat Enterprise Linux 8, Red Hat Openshift Data Foundation 4 · no fix planned: Red Hat Ceph Storage 7, Red Hat Ceph Storage 8, Red Hat Enterprise Linux 8, Red Hat Openshift Data Foundation 4 · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-30156.json)","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":49,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}