CVE-2025-0588Network attack vector

Authenticated service interruption via poisoned response headers

Published Feb 11, 2025 · Updated Mar 13, 2025

Denial of service in affected Octopus Server releases allows remote authenticated users to interrupt the web portal and REST API. The global custom-header setting accepts a crafted referrer header and applies it to every server response without neutralizing the value, producing HTTP 500 errors. A valid CSRF token and sufficient access to manage custom response headers are required; once set, new CSRF tokens cannot be generated and the site remains mostly unusable until the header is unset.

CVSS severity5.9
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in affected Octopus Server releases allows remote authenticated users to interrupt the web portal and REST API. The global custom-header setting accepts a crafted referrer header and applies it to every server response without neutralizing the value, producing HTTP 500 errors. A valid CSRF token and sufficient access to manage custom response headers are required; once set, new CSRF tokens cannot be generated and the site remains mostly unusable until the header is unset.

The record

CVE
CVE-2025-0588
Published
Feb 11, 2025
Updated
Mar 13, 2025
Vendor
Octopus Deploy
Product
Octopus Server
Classifications
CWE-113, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 13, 2025Record 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=2020.1.0 <2024.3.13097
  2. Affected versionversion=2024.4.401 <2024.4.7091

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Octopus Deploy · Octopus Serverversion=2020.1.0 <2024.3.13097; version=2024.4.401 <2024.4.7091

Published CVSS scores

5.9Octopus DeployCVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
4.9NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-113Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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