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Vulnerability details: VCID-wgfb-z4ue-ubew
Vulnerability ID VCID-wgfb-z4ue-ubew
Aliases CVE-2017-2666
GHSA-mcfm-h73v-635m
Summary Undertow-core vulnerable to HTTP Request Smuggling It was discovered in Undertow that the code that parsed the HTTP request line permitted invalid characters. This could be exploited, in conjunction with a proxy that also permitted the invalid characters but with a different interpretation, to inject data into the HTTP response. By manipulating the HTTP response the attacker could poison a web-cache, perform an XSS attack, or obtain sensitive information from requests other than their own.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3 6.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2017-2666.json
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
epss 0.02154 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
epss 0.02154 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
epss 0.02154 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
epss 0.02154 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
epss 0.02154 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
epss 0.02154 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
epss 0.02154 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
epss 0.02154 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
epss 0.02154 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
epss 0.02154 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
epss 0.02154 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
epss 0.02154 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
epss 0.02223 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
epss 0.02223 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
epss 0.02223 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
epss 0.02955 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
epss 0.02955 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
epss 0.02955 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
epss 0.02955 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
epss 0.02955 https://api.first.org/data/v1/epss?cve=CVE-2017-2666
cvssv3.1 6.5 https://github.com/advisories/GHSA-mcfm-h73v-635m
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-mcfm-h73v-635m
generic_textual MODERATE https://github.com/advisories/GHSA-mcfm-h73v-635m
cvssv2 6.4 https://nvd.nist.gov/vuln/detail/CVE-2017-2666
cvssv3 6.5 https://nvd.nist.gov/vuln/detail/CVE-2017-2666
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2017-2666
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2017-2666
Reference id Reference type URL
http://rhn.redhat.com/errata/RHSA-2017-1409.html
https://access.redhat.com/errata/RHSA-2017:1410
https://access.redhat.com/errata/RHSA-2017:1411
https://access.redhat.com/errata/RHSA-2017:1412
https://access.redhat.com/errata/RHSA-2017:3454
https://access.redhat.com/errata/RHSA-2017:3455
https://access.redhat.com/errata/RHSA-2017:3456
https://access.redhat.com/errata/RHSA-2017:3458
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2017-2666.json
https://api.first.org/data/v1/epss?cve=CVE-2017-2666
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2666
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-2666
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-2670
https://github.com/advisories/GHSA-mcfm-h73v-635m
https://nvd.nist.gov/vuln/detail/CVE-2017-2666
https://www.debian.org/security/2017/dsa-3906
http://www.securityfocus.com/bid/98966
1436163 https://bugzilla.redhat.com/show_bug.cgi?id=1436163
864405 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=864405
cpe:2.3:a:redhat:undertow:-:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:redhat:undertow:-:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
RHSA-2017:1409 https://access.redhat.com/errata/RHSA-2017:1409
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2017-2666.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://github.com/advisories/GHSA-mcfm-h73v-635m
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2017-2666
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2017-2666
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2017-2666
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.81144
EPSS Score 0.01616
Published At Sept. 16, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:55:28.594317+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2018/10/GHSA-mcfm-h73v-635m/GHSA-mcfm-h73v-635m.json 37.0.0