CVE-2021-3509

Exp

A flaw was found in Red Hat Ceph Storage 4, in the Dashboard component. In response to CVE-2020-27839, the JWT token was moved from localStorage to an httpOnly cookie. However, token cookies are used in the body of the HTTP response for the documentation, which again makes it available to XSS.The greatest threat to the system is for confidentiality, integrity, and availability.

Published: 2021-05-27 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-3509 is rated High Exploit Risk (66.5/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.70%). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.10% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-2021-3509

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-3509

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 2026-06-15 0.60% 1.70% +1.10%
2 2026-01-05 0.22% 0.60% +0.38%
3 2025-11-21 — 0.22% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-3509

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
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:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2021-3509

OS Trackers for CVE-2021-3509

vendor priority summary link
alpine medium CVE-2021-3509: 2 source package rows (ceph, ceph16); 4 state rows across 3 repos (3.17-community, 3.18-community, edge-community); fixed 4, open 0. https://security.alpinelinux.org/vuln/CVE-2021-3509
debian not yet assigned CVE-2021-3509 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-2021-3509
redhat medium — https://access.redhat.com/security/cve/CVE-2021-3509
suse high CVE-2021-3509 severity important: SUSE including 383 source package names (0.45.0.8.14.1:librados2-15.2.12.83+g528da226523-3.25.1, 0.45.0.8.14.1:librbd1-15.2.12.83+g528da226523-3.25.1, …), 959 product×package rows across 74 product lines (Container caasp/v4/hyperkube, Container ses/6/cephcsi/cephcsi, … (74 product lines)): Fixed 567, Known Not Affected 392. https://www.suse.com/security/cve/CVE-2021-3509/
ubuntu medium CVE-2021-3509 medium priority: Ubuntu including 1 source packages (ceph), 9 status rows across 9 suites (bionic, focal, groovy, hirsute, impish, jammy, trusty, upstream, xenial): released 6, not-affected 3. https://ubuntu.com/security/CVE-2021-3509

Affected software / configurations for CVE-2021-3509

Vendor Product Version Raw CPE
redhat ceph_storage 4.0 cpe:2.3:a:redhat:ceph_storage:4.0:*:*:*:*:*:*:*

References for CVE-2021-3509

cvelogic Threat Intelligence