Skip to main content
HIGH

CVE-2025-30156

CVSS v3

8.9

HIGH

EPSS Score

0.1 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Get an alert for each new CVE published for ceph.

Set up CVE WatchFree account · no credit card

Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • cephBitnamiall versions · fixed in 19.2.6

Vendor advisories

  • CVE-2025-30156 Red Hat Product Security1,685 products fixed · 63 known affected

    kernel: ceph: kernel: Ceph: exploit of hardcoded IVECs, in a misuse of AES, resulting in authentication bypass

    ceph-base as a component of Red Hat Ceph Storage 7 · ceph-common as a component of Red Hat Ceph Storage 7 · ceph-fuse as a component of Red Hat Ceph Storage 7

  • RHSA-2026:83548 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Red Hat Ceph Storage

  • RHSA-2026:79243 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Ceph Storage

  • RHSA-2026:79101 Red Hat Product Security221 products fixed

    Red Hat Security Advisory: Red Hat Ceph Storage 8.1 security and bug fix updates

  • RHSA-2026:27708 Red Hat Product Security305 products fixed

    Red Hat Security Advisory: kernel security, bug fix, and enhancement update

  • RHSA-2026:27735 Red Hat Product Security233 products fixed

    Red Hat Security Advisory: kernel security, bug fix, and enhancement update

3 more advisories

Full record on NVD

Description

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 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.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
Published
2026-08-28
Last Modified
2026-08-28

Frequently asked questions

What is CVE-2025-30156?

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 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.

Is CVE-2025-30156 actively exploited?

Active exploitation of CVE-2025-30156 has not been confirmed. Its EPSS score was 0.1% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-30156?

CVE-2025-30156 has a CVSS v3 base score of 8.9 (HIGH severity), with vector string CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L.

Running ceph? Hear about its next vulnerability

CVE Watch matches each new CVE to the vendors and products you list (vendor and product, not the version) and puts it in your alerts with its KEV and EPSS status.

Get alerts for this productCISA KEV additions, October 2026Search CVEs

Already have an account? Open CVE WatchNo credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database