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CVE-2025-30156— Ceph: AES-CBC misuse in CephX and RADOSGW enables authentication bypass and credential forgery

Quick assessment

Affected
ceph ceph
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ceph是Ceph社区开源的一款分布式存储系统。 Ceph 20.2.4之前版本和19.2.6之前版本存在加密问题漏洞，该漏洞源于CephX认证协议使用AES-128-CBC未认证模式，且使用硬编码初始化向量并无消息认证，攻击者可利用监控器作为加密预言机伪造特权实体票据，从而获取集群范围访问，或通过翻转服务票据中的单个位将allow_all字段设为true以提升权限。

CVSS 8.9 · High EPSS 0.09% · P1

Affected Version Matrix 2

VendorProduct Version RangeStatus
ceph ceph < 19.2.6 affected
>= 20.0.0, < 20.2.4 affected
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I. Basic Information for CVE-2025-30156

Vulnerability Information
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Vulnerability Title
Ceph: AES-CBC misuse in CephX and RADOSGW enables authentication bypass and credential forgery
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
使用已被攻破或存在风险的密码学算法
Source: CVE Program / CVE List V5
Vulnerability Title
Ceph 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ceph是Ceph社区开源的一款分布式存储系统。 Ceph 20.2.4之前版本和19.2.6之前版本存在加密问题漏洞，该漏洞源于CephX认证协议使用AES-128-CBC未认证模式，且使用硬编码初始化向量并无消息认证，攻击者可利用监控器作为加密预言机伪造特权实体票据，从而获取集群范围访问，或通过翻转服务票据中的单个位将allow_all字段设为true以提升权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ceph ceph < 19.2.6 -

II. Public POCs for CVE-2025-30156

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III. Intelligence Information for CVE-2025-30156

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Vendor Advisories for CVE-2025-30156 (1)

Same Patch Batch · ceph · 2026-08-27 · 4 CVEs total

CVE-2026-50152 9.1 CRITICAL Ceph Monitor subscription handler improperly authorizes config-key store reads, exposing c
CVE-2026-39944 8.8 HIGH Ceph: CephX AES Authentication error
CVE-2026-54330 8.1 HIGH Ceph RGW SigV4 handler accepts unsigned x-amz-* headers on presigned requests, allowing pr

IV. Related Vulnerabilities

Same product: ceph
Same vendor: ceph
Same weakness: CWE-327

V. Comments for CVE-2025-30156

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