CVE-2020-27781

User credentials can be manipulated and stolen by Native CephFS consumers of OpenStack Manila, resulting in potential privilege escalation. An Open Stack Manila user can request access to a share to an arbitrary cephx user, including existing users. The access key is retrieved via the interface drivers. Then, all users of the requesting OpenStack project can view the access key. This enables the attacker to target any resource that the user has access to. This can be done to even "admin" users, compromising the ceph administrator. This flaw affects Ceph versions prior to 14.2.16, 15.x prior to 15.2.8, and 16.x prior to 16.2.0.

Published: 2020-12-18 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-27781 is rated Low Risk (35.9/100): CVSS High severity, with low exploitation likelihood (EPSS 0.07%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

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-2020-27781

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 2025-10-28 0.04% 0.07% +0.03%
2 2025-07-26 0.05% 0.04% -0.01%
3 2025-03-17 — 0.05% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-27781

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.1 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:L)
A normal user session is enough; they don’t have to be admin.
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:N)
Service keeps running; no real outage angle.
 1.8 5.2 [email protected]
3.6 2.0 LOW
AV:L/AC:L/Au:N/C:P/I:P/A:N Click to expand
Access vector (AV:L)
Requires local access to the target system.
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:N)
No availability impact.
 3.9 4.9 [email protected]

Weakness enumeration for CVE-2020-27781

OS Trackers for CVE-2020-27781

vendor priority summary link
alpine high CVE-2020-27781: 2 source package rows (ceph, ceph16); 8 state rows across 3 repos (3.17-community, 3.18-community, edge-community); fixed 4, open 4. https://security.alpinelinux.org/vuln/CVE-2020-27781
debian not yet assigned CVE-2020-27781 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-2020-27781
gentoo normal CVE-2020-27781: 1 GLSA(s) (202105-39), 1 atom(s) (sys-cluster/ceph); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-27781
redhat high — https://access.redhat.com/security/cve/CVE-2020-27781
suse high CVE-2020-27781 severity important: SUSE including 429 source package names (0.38.1.5.8.40:librados2-15.2.8.80+g1f4b6229ca-3.13.1, 0.38.1.5.8.40:librbd1-15.2.8.80+g1f4b6229ca-3.13.1, …), 651 product×package rows across 54 product lines (Container caasp/v4/hyperkube, Container ses/6/cephcsi/cephcsi, … (54 product lines)): Fixed 460, Will Not Fix 148, Known Not Affected 43. https://www.suse.com/security/cve/CVE-2020-27781/
ubuntu medium CVE-2020-27781 medium priority: Ubuntu including 1 source packages (ceph), 15 status rows across 15 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, trusty, upstream, xenial): released 13, ignored 1, not-affected 1. https://ubuntu.com/security/CVE-2020-27781

Affected software / configurations for CVE-2020-27781

Vendor Product Version Raw CPE
redhat ceph < 14.2.16 cpe:2.3:a:redhat:ceph:*:*:*:*:*:*:*:*
redhat ceph >= 15.0.0, < 15.2.8 cpe:2.3:a:redhat:ceph:*:*:*:*:*:*:*:*
redhat ceph >= 16.0.0, < 16.2.0 cpe:2.3:a:redhat:ceph:*:*:*:*:*:*:*:*
redhat ceph_storage 2.0 cpe:2.3:a:redhat:ceph_storage:2.0:*:*:*:*:*:*:*
redhat ceph_storage 3.0 cpe:2.3:a:redhat:ceph_storage:3.0:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
redhat openstack_platform 13.0 cpe:2.3:a:redhat:openstack_platform:13.0:*:*:*:*:*:*:*
fedoraproject fedora 33 cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*

References for CVE-2020-27781

cvelogic Threat Intelligence