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Fencer Vulns
high 8.8

CVE-2020-25660 json

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 c…

published 2020-11-23 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-18322

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 64%
public exploits
0
none known

Summary

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.

Patch / fix

  • redhat ceph 14.2.14, 15.2.6
  • ceph Debian 14, Debian 13, Debian 12 14.2.15-1

debian advisories DEBIAN-CVE-2020-25660

  • ceph Ubuntu 20.04 LTS 15.2.7-0ubuntu0.20.04.2

ubuntu advisories UBUNTU-CVE-2020-25660

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • ceph ceph storage 4 2:14.2.11-95.el7cp
  • ceph ceph storage 4 2:14.2.11-95.el8cp
  • librbd1 ceph storage 4 2:14.2.11-95.el7cp
  • librbd1 ceph storage 4 2:14.2.11-95.el8cp
  • librgw2 ceph storage 4 2:14.2.11-95.el7cp
  • librgw2 ceph storage 4 2:14.2.11-95.el8cp
  • rbd-nbd ceph storage 4 2:14.2.11-95.el7cp
  • rbd-nbd ceph storage 4 2:14.2.11-95.el8cp

red hat advisories RHSA-2021:0081RHSA-2020:5325

  • ceph SLE Module for Basesystem 15 SP2, Enterprise Storage 7 15.2.5.667+g1a579d5bf2-3.5.1
  • ceph Enterprise Storage 7 15.2.5.667+g1a579d5bf2-3.3.1
  • ceph SLE Module for Basesystem 15 SP1, Enterprise Storage 6 14.2.13.450+g65ea1b614d-3.52.1

suse advisories SUSE-SU-2020:3473-2SUSE-SU-2020:3539-1SUSE-SU-2020:3473-1SUSE-SU-2020:3459-1

  • ceph openSUSE Tumbleweed 16.2.6.463+g22e7612f9ad-1.1
  • ceph openSUSE Leap 15.2 15.2.5.667+g1a579d5bf2-lp152.2.3.1
  • ceph-test openSUSE Leap 15.2 15.2.5.667+g1a579d5bf2-lp152.2.3.1
  • ceph openSUSE Leap 15.1 14.2.13.450+g65ea1b614d-lp151.2.28.1
  • ceph-test openSUSE Leap 15.1 14.2.13.450+g65ea1b614d-lp151.2.28.1

opensuse advisories openSUSE-SU-2024:11652-1openSUSE-SU-2020:2082-1openSUSE-SU-2020:2057-1

  • ceph Alpine 3.12, Alpine 3.11 14.2.19-r0
  • ceph Alpine 3.16, Alpine 3.15, Alpine 3.14 +1 more 15.2.6-r0
  • ceph16 Alpine 3.18, Alpine 3.17 15.2.6-r0

alpine advisories ALPINE-CVE-2020-25660

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-25660 updated cvss 8.8

ceph: CEPHX_V2 replay attack protection lost

  • Red Hat Ceph Storage 2 ceph, librbd1, librgw2, ceph-mds, ceph-mon, ceph-osd, +12 more Red Hat Openshift Container Storage 4 ceph
    affected: no fix planned “Out of support scope”
  • Red Hat Ceph Storage 4.1 MON ceph 14.2.8-115.el7cp, ceph 14.2.8-115.el8cp, librbd1 14.2.8-115.el7cp, librbd1 14.2.8-115.el8cp, librgw2 14.2.8-115.el7cp, librgw2 14.2.8-115.el8cp, +38 more Red Hat Ceph Storage 4.1 OSD ceph 14.2.8-115.el7cp, ceph 14.2.8-115.el8cp, librbd1 14.2.8-115.el7cp, librbd1 14.2.8-115.el8cp, librgw2 14.2.8-115.el7cp, librgw2 14.2.8-115.el8cp, +26 more Red Hat Ceph Storage 4.1 Tools ceph 14.2.8-115.el7cp, ceph 14.2.8-115.el8cp, librbd1 14.2.8-115.el7cp, librbd1 14.2.8-115.el8cp, librgw2 14.2.8-115.el7cp, librgw2 14.2.8-115.el8cp, +34 more
    fixed: vendor fix RHSA-2020:5325
  • Red Hat Ceph Storage 4.2 MON ceph 14.2.11-95.el7cp, ceph 14.2.11-95.el8cp, librbd1 14.2.11-95.el7cp, librbd1 14.2.11-95.el8cp, librgw2 14.2.11-95.el7cp, librgw2 14.2.11-95.el8cp, +38 more Red Hat Ceph Storage 4.2 OSD ceph 14.2.11-95.el7cp, ceph 14.2.11-95.el8cp, librbd1 14.2.11-95.el7cp, librbd1 14.2.11-95.el8cp, librgw2 14.2.11-95.el7cp, librgw2 14.2.11-95.el8cp, +26 more Red Hat Ceph Storage 4.2 Tools ceph 14.2.11-95.el7cp, ceph 14.2.11-95.el8cp, librbd1 14.2.11-95.el7cp, librbd1 14.2.11-95.el8cp, librgw2 14.2.11-95.el7cp, librgw2 14.2.11-95.el8cp, +34 more
    fixed: vendor fix RHSA-2021:0081
  • Red Hat OpenShift Container Storage 4.6 on RHEL-8 ocs4/ocs-operator-bundle 4.6.2-1, ocs4/mcg-core-rhel8 5.6.0-42.6a01c5fc0.5.6, ocs4/mcg-rhel8-operator 5.6.0-41.2279a46.5.6, ocs4/cephcsi-rhel8 4.6-54.49cf5efdd.release_4.6, ocs4/ocs-rhel8-operator 4.6-78.3b7455e4.release_4.6, ocs4/ocs-must-gather-rhel8 4.6-78.3b7455e4.release_4.6, +1 more
    fixed: vendor fix RHBA-2021:0305
  • Red Hat Ceph Storage 3 ceph, librbd1, librgw2, ceph-mds, ceph-mgr, ceph-mon, +15 more Red Hat Ceph Storage 4.2 MON python-repoze-lru 0.7-8.el7cp, python-repoze-lru 0.7-6.el8ost, python2-repoze-lru 0.7-8.el7cp, python3-repoze-lru 0.7-6.el8ost Red Hat Ceph Storage 4.2 Tools libntirpc 3.3-0.1.el7cp, libntirpc 3.3-0.1.el8cp, nfs-ganesha 3.3-0.4.el7cp, nfs-ganesha 3.3-0.4.el8cp, ceph-ansible 4.0.41-1.el7cp, ceph-ansible 4.0.41-1.el8cp, +17 more Red Hat Enterprise Linux 7 librbd1, librados2, python-rbd, ceph-common, python-rados Red Hat Enterprise Linux 8 librbd1, librados2, libcephfs2, libradosstriper1 Red Hat Enterprise Linux 9 librbd1, librados2
    +1 more products
    Red Hat OpenStack Platform 13 (Queens) librbd1, librgw2, ceph-fuse, librados2, libcephfs2, python-rbd, +6 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.03% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 5.8 AV:A/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • n/a ceph

Classification

Weakness
  • CWE-294 Authentication Bypass by Capture-replay

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.