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Vulnerability record · CVE-2020-25660 · published 23 November 2020

CVE-2020-25660: Redhat ceph authentication bypass by capture-replay vulnerability

Redhat · Ceph

A flaw was found in the Cephx authentication protocol in versions before 15.2.6 and before 14.2.14, where it does not verify Ceph clients correctly and is then vulnerable to replay attacks in Nautilus. This flaw allows an attacker with access to the Ceph cluster network to authenticate with the Ceph service via a packet sniffer and perform actions allowed by the Ceph service. This issue is a reintroduction of CVE-2018-1128, affecting the msgr2 protocol. The msgr 2 protocol is used for all communication except older clients that do not support the msgr2 protocol. The msgr1 protocol is not affected. The highest threat from this vulnerability is to confidentiality, integrity, and system availability.

8.8 CVSS 3.1 High EPSS 1.0% · top 37.6% CWE-294 · Authentication bypass by capture-replay
8.8CVSS 3.1 base score, v2 5.8
1.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

A flaw was found in the Cephx authentication protocol in versions before 15.2.6 and before 14.2.14, where it does not verify Ceph clients correctly and is then vulnerable to replay attacks in Nautilus. This flaw allows an attacker with access to the Ceph cluster network to authenticate with the Ceph service via a packet sniffer and perform actions allowed by the Ceph service. This issue is a reintroduction of CVE-2018-1128, affecting the msgr2 protocol. The msgr 2 protocol is used for all communication except older clients that do not support the msgr2 protocol. The msgr1 protocol is not affected. The highest threat from this vulnerability is to confidentiality, integrity, and system availability.

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

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=1890354 Issue TrackingThird Party Advisory
https://ceph.io/community/v15-2-6-octopus-released/ Release NotesVendor Advisory
https://ceph.io/releases/v14-2-14-nautilus-released/ Release NotesVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UBC4KZ44QUQENTYZPVHORGL
https://security.gentoo.org/glsa/202105-39 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1890354 Issue TrackingThird Party Advisory
https://ceph.io/community/v15-2-6-octopus-released/ Release NotesVendor Advisory
https://ceph.io/releases/v14-2-14-nautilus-released/ Release NotesVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UBC4KZ44QUQENTYZPVHORGL
https://security.gentoo.org/glsa/202105-39 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-25660), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.