CVE-2025-6442
Ruby WEBrick read_header HTTP Request Smuggling Vulnerability
Public exploit available. Not confirmed exploited in the wild yet. A vendor fix is available.
What to do
The vendor has published a fix. Version details are below where the sources state them.
What it is
From the CVE record
Ruby WEBrick read_headers method can lead to HTTP Request/Response Smuggling
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Not in the catalog. CISA has not confirmed exploitation.
- Public exploits
1 source with a proof of concept or module.
Exploit links, PoCs and Metasploit modules after sign-in- EPSS
0.5% chance of exploitation activity in the next 30 days, which ranks it in the 38th percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
The patch came 200 days before any public exploit.
- OpenVAS check added
- Public exploit / PoCsource: github-poc
- Patch availablerecord updated
- Publishedweakness classified, att&ck mapped
Affected products
- Red Hat 3scale API Management PlatformOperating Systems / linux-distro
- Red Hat SatelliteOperating Systems / linux-distro
- Red Hat Enterprise LinuxOperating Systems / linux-distro
- Logging subsystem for Red Hat OpenShiftOperating Systems / linux-distro
- Openshift Service MeshOperating Systems / linux-distro
And 3 more affected products. See all after sign-in
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Scored 5.9 by NVD.
How it is reached
- Attack Vector NetworkExploitable remotely over the network without any special conditions
- Attack Complexity HighRequires specific conditions like a race condition or non-default configuration
- Privileges Required NoneNo authentication required — anyone can exploit this
- User Interaction NoneNo user interaction needed — fully automated exploitation
Scope
- Scope UnchangedImpact is limited to the vulnerable component itself
Impact if exploited
- Confidentiality NoneNo confidentiality impact
- Integrity HighTotal loss of integrity — attacker can modify any data in the component
- Availability NoneNo availability impact
Weaknesses
ATT&CK techniques
Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.
Sources
References in the record
- nvd.nist.gov/vuln/detail/CVE-2025-6442
- github.com/ruby/webrick/commit/ee60354bcb84ec33b9245e1d1aa6e1f7e8132101
- github.com/ruby/webrick
And 11 more references. See all after sign-in
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