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CVE-2025-30156 is an authentication bypass vulnerability in CephX, Ceph’s authentication mechanism, caused by a broken cryptographic design. CephX used AES-CBC without authentication and with a hardcoded initialization vector, a vulnerability class analogous to historical flaws in legacy Kerberos designs. This construction permits identical plaintext blocks to yield identical ciphertext patterns and lacks integrity protection, enabling CBC bit-flipping attacks. An attacker who has compromised a CephX entity or recovered its shared secret from Ceph network traffic can tamper with CephX tickets and alter permissions without detection. The flaw can also enable inference about plaintext from ciphertext structure. Patched Ceph releases replace the vulnerable construction with AES-256-CTS-HMAC-SHA384-192 and introduce a new CephX key type to support the corrected design.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A specific vulnerability listed as a referenced CVE in the Fedora security advisory.
A vulnerability referenced in this Fedora security notice affecting Fedora 44 ceph packages; no further technical detail is provided in the content.
A specific vulnerability identified as CVE-2025-30156, referenced in a Nessus plugin as unpatched/vendor-unpatched and associated with Debian Linux and Ceph.
An authentication bypass vulnerability in CephX caused by misuse of AES-CBC.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.