CVE-2025-6442

mediumpriority · track · 24EPSS 0.005 · 42 %ileDEEUNLRUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.50% (42nd) EPSS
CVSS 5.9 · medium
Is it mine?
28 products
Check your exposure
Who says so?
6 sources
cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-26

Ruby WEBrick read_header HTTP Request Smuggling Vulnerability. This vulnerability allows remote attackers to smuggle arbitrary HTTP requests on affected installations of Ruby WEBrick. This issue is exploitable when the product is deployed behind an HTTP proxy that fulfills specific conditions. The specific flaw exists within the read_headers method. The issue results from the inconsistent parsing of terminators of HTTP headers. An attacker can leverage this vulnerability to smuggle arbitrary HTTP requests. Was ZDI-CAN-21876.

01

cvss

Technical severity, 0–10. One row per scoring source.

6.5
010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:Nprimary · NVD / NIST USexploitability 2.2 · impact 3.6
v3.06.5mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:Nsecondary · ENISA EU
v3.06.5mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:Nsecondary · zdi-disclosures@trendmicro.comexploitability 2.2 · impact 4.2
v3.06.5mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:Nsecondary · OSV
v3.06.5mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:Nsecondary · NCSC-NL NL
v3.15.9mediumAV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:Nsecondary · FSTEC (BDU) RU
v3.15.4mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)
02

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-444USCWE-444USCWE-444USCWE-444US
04

affected products (28)

Products and version ranges known to be affected.

showing 20 of 28
05

advisories (3)

Vendor and ecosystem advisories describing this.

  • NCSC-2025-0351Kwetsbaarheden verholpen in Apple MacOSNL2025-11-04csaf · ncsc_nlNL

    Apple heeft kwetsbaarheden verholpen in macOS Sonoma 14.8.2, macOS Sequoia 15.7.2 en MacOS Tahoe 26.1.

  • WID-SEC-W-2025-2475Apple macOS: Mehrere SchwachstellenDeutsch2025-11-03csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in Apple macOS ausnutzen, um Informationen offenzulegen, um einen Denial of Service Angriff durchzuführen, um Sicherheitsvorkehrungen zu umgehen, um Dateien zu manipulieren, und um seine Privilegien zu erhöhen.

  • GHSA-r995-q44h-hr64Ruby WEBrick read_headers method can lead to HTTP Request/Response Smuggling2025-06-26ghsa · osvUS

    Ruby WEBrick read_header HTTP Request Smuggling Vulnerability. This vulnerability allows remote attackers to smuggle arbitrary HTTP requests on affected installations of Ruby WEBrick. This issue is exploitable when the product is deployed behind an HTTP proxy that fulfills specific conditions. The specific flaw exists within the read_headers method. The issue results from the inconsistent parsing of terminators of HTTP headers. An attacker can leverage this vulnerability to smuggle arbitrary HTTP requests. Was ZDI-CAN-21876.

06

also known as (6)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bducert_bundncsc_nlosvNVDCVE.orgMITRE
published 2025-06-25modified 2026-06-17
08

references (9)

External citations — patches, advisories, analysis.

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