CVE-2020-10753Network attack vector

Response header injection via unsanitized CORS ExposeHeader

Published Jun 26, 2020 · Updated Aug 4, 2024

HTTP response splitting in Red Hat Ceph Storage 3.x and 4.x allows remote attackers to inject arbitrary headers through an S3 CORS request. RGWCORSRule::format_exp_headers appends ExposeHeader values from an S3 CORS XML document to Access-Control-Expose-Headers without escaping newline characters. Exploitation requires a crafted CORS configuration and a user's cross-origin request, after which injected headers can alter the browser-visible response.

CVSS severity5.4
Medium
EPSS probability1.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTTP response splitting in Red Hat Ceph Storage 3.x and 4.x allows remote attackers to inject arbitrary headers through an S3 CORS request. RGWCORSRule::format_exp_headers appends ExposeHeader values from an S3 CORS XML document to Access-Control-Expose-Headers without escaping newline characters. Exploitation requires a crafted CORS configuration and a user's cross-origin request, after which injected headers can alter the browser-visible response.

The record

CVE
CVE-2020-10753
Published
Jun 26, 2020
Updated
Aug 4, 2024
Vendor
389 Directory Server
Product
Red Hat Ceph Storage
Classifications
CWE-113, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 26, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=versions 3.x and 4.x

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

389 Directory Server · Red Hat Ceph Storageversion=versions 3.x and 4.x

Published CVSS scores

5.4Red Hat, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-113Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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