CVE-2025-0588: linux kernel — Fix

Description

In affected versions of Octopus Server it was possible for a user with sufficient access to set custom headers in all server responses. By submitting a specifically crafted referrer header the user could ensure that all subsequent server responses would return 500 errors rendering the site mostly unusable. The user would be able to subsequently set and unset the referrer header to control the denial of service state with a valid CSRF token whilst new CSRF tokens could not be generated.

Is your site exposed to CVE-2025-0588?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

4.9

MEDIUM

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

Weakness Type (CWE)

CWE-113 CWE-113

Affected Products

Vendor	Product	Versions
octopus	octopus_server	2020.1.0 — 2024.3.13097
octopus	octopus_server	2024.4.401 — 2024.4.7091
linux	linux_kernel	All
microsoft	windows	All

References

Advisories & Patches

https://advisories.octopus.com/post/2025/sa2025-05/

Other References

https://advisories.octopus.com/post/2024/sa2025-05/ https://advisories.octopus.com/post/2024/sa2025-05/

Frequently Asked Questions

What is CVE-2025-0588? +

In affected versions of Octopus Server it was possible for a user with sufficient access to set custom headers in all server responses. By submitting a specifically crafted referrer header the user could ensure that all subsequent server responses would return 500 errors rendering the site mostly unusable. The user would be able to subsequently set and unset the referrer header to control the denial of service state with a valid CSRF token whilst new CSRF tokens could not be generated. It has a CVSS v3.1 base score of 4.9 (MEDIUM).

How severe is CVE-2025-0588? +

CVE-2025-0588 has a CVSS v3.1 score of 4.9 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-0588? +

CVE-2025-0588 affects products from linux, microsoft, octopus, specifically: linux_kernel, octopus_server, windows. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-0588? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2025-52479

HTTP.jl provides HTTP client and server functionality for Julia, and URIs.jl parses and works with Uniform Resource Identifiers (URIs). URIs.jl …

CVE-2026-48596

Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') vulnerability in elixir-tesla tesla allows HTTP header injection via …

CVE-2025-53007

arduino-esp32 provides an Arduino core for the ESP32. Versions prior to 3.3.0-RC1 and 3.2.1 contain a HTTP Response Splitting vulnerability. …

CVE-2025-61689

HTTP.jl is an HTTP client and server functionality for the Julia programming language. Prior to version 1.10.19, HTTP.jl did not …

CVE-2025-53094

ESPAsyncWebServer is an asynchronous HTTP and WebSocket server library for ESP32, ESP8266, RP2040 and RP2350. In versions up to and …

CVE-2026-43966

Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') vulnerability in ninenines cowlib allows HTTP response splitting via …

CVE-2025-0588