CVE-2020-25660

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.

Published: 2020-11-23 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-25660 is rated Moderate Risk (49.3/100): CVSS High severity, with low exploitation likelihood (EPSS 0.19%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-25660

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-26 0.27% 0.19% -0.08%
2 2025-11-21 0.19% 0.27% +0.08%
3 2025-11-18 — 0.19% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-25660

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
5.8 2.0 MEDIUM
AV:A/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:A)
Requires access to an adjacent network segment.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 6.5 6.4 [email protected]

Weakness enumeration for CVE-2020-25660

OS Trackers for CVE-2020-25660

vendor priority summary link
alpine high CVE-2020-25660: 2 source package rows (ceph, ceph16); 7 state rows across 3 repos (3.17-community, 3.18-community, edge-community); fixed 4, open 3. https://security.alpinelinux.org/vuln/CVE-2020-25660
debian not yet assigned CVE-2020-25660 not yet assigned priority: Debian including 1 source packages (ceph), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2020-25660
gentoo normal CVE-2020-25660: 1 GLSA(s) (202105-39), 1 atom(s) (sys-cluster/ceph); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-25660
redhat medium — https://access.redhat.com/security/cve/CVE-2020-25660
suse high CVE-2020-25660 severity important: SUSE including 436 source package names (0.38.1.5.8.40:librados2-15.2.5.667+g1a579d5bf2-3.5.1, 0.38.1.5.8.40:librbd1-15.2.5.667+g1a579d5bf2-3.5.1, …), 916 product×package rows across 74 product lines (Container caasp/v4/hyperkube, Container ses/6/cephcsi/cephcsi, … (74 product lines)): Fixed 460, Known Not Affected 456. https://www.suse.com/security/cve/CVE-2020-25660/
ubuntu medium CVE-2020-25660 medium priority: Ubuntu including 1 source packages (ceph), 6 status rows across 6 suites (bionic, focal, groovy, trusty, upstream, xenial): not-affected 3, released 3. https://ubuntu.com/security/CVE-2020-25660

Affected software / configurations for CVE-2020-25660

Vendor Product Version Raw CPE
redhat ceph < 14.2.14 cpe:2.3:a:redhat:ceph:*:*:*:*:*:*:*:*
redhat ceph >= 15.0.0, < 15.2.6 cpe:2.3:a:redhat:ceph:*:*:*:*:*:*:*:*
redhat ceph_storage 2.0 cpe:2.3:a:redhat:ceph_storage:2.0:*:*:*:*:*:*:*
redhat ceph_storage 4.0 cpe:2.3:a:redhat:ceph_storage:4.0:*:*:*:*:*:*:*
redhat openshift_container_platform 4.0 cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*
fedoraproject fedora 33 cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*

References for CVE-2020-25660

cvelogic Threat Intelligence