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NVD / CVE Program· CNA redhat

CVE-2021-3524: A flaw was found in the Red Hat Ceph Storage RadosGW (Ceph Object Gateway) in versions before 14.2.21.

Noroxi assessment

Priority: Monitor (action score 26/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.6% (FIRST EPSS); higher than 75.8% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: ceph (Debian:10) 12.2.11+dfsg1-2.1+deb10u1; ceph (Debian:12) 14.2.21-1; ceph (Debian:9) 10.2.11-2+deb9u1.

Low priority for now. Upgrade to ceph (Debian:10) 12.2.11+dfsg1-2.1+deb10u1; ceph (Debian:12) 14.2.21-1; ceph (Debian:9) 10.2.11-2+deb9u1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A flaw was found in the Red Hat Ceph Storage RadosGW (Ceph Object Gateway) in versions before 14.2.21. The vulnerability is related to the injection of HTTP headers via a CORS ExposeHeader tag. The newline character in the ExposeHeader tag in the CORS configuration file generates a header injection in the response when the CORS request is made. In addition, the prior bug fix for CVE-2020-10753 did not account for the use of \r as a header separator, thus a new flaw has been created.

MediumCVSS 6.5 · v3.1—No exploit Fix available
Published
May 17, 2021
Updated
Jun 17, 2026
EPSS
1.6% · 75th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.6%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-3524

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
redhatceph
redhatceph storage
fedoraprojectfedora
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux9.0
  • fedoraproject fedora32
  • fedoraproject fedora33
  • fedoraproject fedora34
  • redhat cephbefore 14.2.21
  • redhat ceph storage4.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a ceph

    • ceph 14.2.21affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:10cephbefore 12.2.11+dfsg1-2.1+deb10u112.2.11+dfsg1-2.1+deb10u1
Debian:12cephbefore 14.2.21-114.2.21-1
Debian:9cephbefore 10.2.11-2+deb9u110.2.11-2+deb9u1
openSUSE:Leap 15.2cephbefore 15.2.12.83+g528da226523-lp152.2.18.115.2.12.83+g528da226523-lp152.2.18.1
openSUSE:Leap 15.2ceph-testbefore 15.2.12.83+g528da226523-lp152.2.18.115.2.12.83+g528da226523-lp152.2.18.1
openSUSE:Leap 15.3cephbefore 15.2.12.83+g528da226523-3.25.115.2.12.83+g528da226523-3.25.1
openSUSE:Leap 15.3ceph-testbefore 15.2.12.83+g528da226523-3.25.115.2.12.83+g528da226523-3.25.1
Red Hat:ceph_storage:4::el7cephbefore 2:14.2.22-110.el7cp2:14.2.22-110.el7cp
Red Hat:ceph_storage:4::el7ceph-basebefore 2:14.2.22-110.el7cp2:14.2.22-110.el7cp
Red Hat:ceph_storage:4::el7ceph-commonbefore 2:14.2.22-110.el7cp2:14.2.22-110.el7cp
Red Hat:ceph_storage:4::el7ceph-debuginfobefore 2:14.2.22-110.el7cp2:14.2.22-110.el7cp
Red Hat:ceph_storage:4::el7ceph-fusebefore 2:14.2.22-110.el7cp2:14.2.22-110.el7cp
Red Hat:ceph_storage:4::el7ceph-grafana-dashboardsbefore 2:14.2.22-110.el7cp2:14.2.22-110.el7cp
Red Hat:ceph_storage:4::el7ceph-mdsbefore 2:14.2.22-110.el7cp2:14.2.22-110.el7cp
Red Hat:ceph_storage:4::el7ceph-mgrbefore 2:14.2.22-110.el7cp2:14.2.22-110.el7cp
Red Hat:ceph_storage:4::el7ceph-mgr-dashboardbefore 2:14.2.22-110.el7cp2:14.2.22-110.el7cp
Red Hat:ceph_storage:4::el7ceph-mgr-diskprediction-localbefore 2:14.2.22-110.el7cp2:14.2.22-110.el7cp
Red Hat:ceph_storage:4::el7ceph-mgr-k8seventsbefore 2:14.2.22-110.el7cp2:14.2.22-110.el7cp
Red Hat:ceph_storage:4::el7ceph-mgr-rookbefore 2:14.2.22-110.el7cp2:14.2.22-110.el7cp
Red Hat:ceph_storage:4::el7ceph-monbefore 2:14.2.22-110.el7cp2:14.2.22-110.el7cp
Red Hat:ceph_storage:4::el7ceph-osdbefore 2:14.2.22-110.el7cp2:14.2.22-110.el7cp
Red Hat:ceph_storage:4::el7ceph-radosgwbefore 2:14.2.22-110.el7cp2:14.2.22-110.el7cp
Red Hat:ceph_storage:4::el7ceph-selinuxbefore 2:14.2.22-110.el7cp2:14.2.22-110.el7cp
Red Hat:ceph_storage:4::el7ceph-testbefore 2:14.2.22-110.el7cp2:14.2.22-110.el7cp

+96

Same product

redhat: all records

Other highest-scoring records for the same primary product.

  • CVE-2020-25660A 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 co
    35Monitor
  • CVE-2022-3650A privilege escalation flaw was found in Ceph.
    31Monitor
  • CVE-2018-7262In Ceph before 12.2.3 and 13.x through 13.0.1, the rgw_civetweb.cc RGWCivetWeb::init_env function in radosgw doesn't handle malformed HTTP h
    31Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2020-27781Dec 18, 2020 · User credentials can be manipulated and stolen by Native CephFS consumers of OpenStack Manila, resulting in potential privilege escalation.
    28Monitor
  • ← EarlierCVE-2020-25678Jan 8, 2021 · A flaw was found in ceph in versions prior to 16.y.z where ceph stores mgr module passwords in clear text.
    17Monitor
  • Later →CVE-2021-3531May 18, 2021 · A flaw was found in the Red Hat Ceph Storage RGW in versions before 14.2.21.
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:ceph14.2.21-1 · Debian:12Package registry (OSV)
opensuse:ceph15.2.12.83+g528da226523-lp152.2.18.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:ceph-test15.2.12.83+g528da226523-lp152.2.18.1 · openSUSE:Leap 15.2Package registry (OSV)
red hat:ceph2:16.2.7-98.el8cp · Red Hat:ceph_storage:5.1::el8Package registry (OSV)
red hat:ceph-base2:16.2.7-98.el8cp · Red Hat:ceph_storage:5.1::el8Package registry (OSV)
red hat:ceph-base-debuginfo2:16.2.7-98.el8cp · Red Hat:ceph_storage:5.1::el8Package registry (OSV)
red hat:ceph-common2:16.2.7-98.el8cp · Red Hat:ceph_storage:5.1::el8Package registry (OSV)
red hat:ceph-common-debuginfo2:16.2.7-98.el8cp · Red Hat:ceph_storage:5.1::el8Package registry (OSV)
red hat:ceph-debugsource2:16.2.7-98.el8cp · Red Hat:ceph_storage:5.1::el8Package registry (OSV)
red hat:ceph-fuse-debuginfo2:16.2.7-98.el8cp · Red Hat:ceph_storage:5.1::el8Package registry (OSV)
red hat:ceph-grafana-dashboards2:16.2.7-98.el8cp · Red Hat:ceph_storage:5.1::el8Package registry (OSV)
red hat:ceph-immutable-object-cache-debuginfo2:16.2.7-98.el8cp · Red Hat:ceph_storage:5.1::el8Package registry (OSV)
red hat:ceph-mds-debuginfo2:16.2.7-98.el8cp · Red Hat:ceph_storage:5.1::el8Package registry (OSV)
red hat:ceph-mgr2:16.2.7-98.el8cp · Red Hat:ceph_storage:5.1::el8Package registry (OSV)
red hat:ceph-mgr-cephadm2:16.2.7-98.el8cp · Red Hat:ceph_storage:5.1::el8Package registry (OSV)
suse:ceph15.2.12.83+g528da226523-3.25.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP2Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
high · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
None

Weakness class (CWE)

CWE-20 · Improper Input Validation

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records