CVE-2025-30156

8.9 HIGH 0.1% exploit odds Fix listed Crypto

What it is

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.

At a glance

Exploitability: Can be exploited from the same network segment with a low-privilege account. High risk of data exposure, data tampering.
Exploit odds: 0.1% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-08-28 00:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-10-19 22:10 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.1% in the next 30 days (EPSS).
Severity: 8.9 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2026-08-28 00:16 UTC
Last modified: 2026-10-19 22:10 UTC
Exploit probability: 0.1% · EPSS, next 30 days
Weakness: CWE-327 · Broken cryptographic algorithm
Record status: Awaiting Analysis

Attack profile CVSS 3.1 · 8.9

Attack vector: Adjacent network
Complexity: Low
Privileges needed: Low
User interaction: None
Scope: Changed
Confidentiality: High
Integrity: High
Availability: Low

Raw vector

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record