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Vulnerability details: VCID-e5cm-rtss-bbfc
Vulnerability ID VCID-e5cm-rtss-bbfc
Aliases CVE-2020-10687
GHSA-p9w3-gwc2-cr49
Summary A flaw was discovered in all versions of Undertow before Undertow 2.2.0.Final, where HTTP request smuggling related to CVE-2017-2666 is possible against HTTP/1.x and HTTP/2 due to permitting invalid characters in an HTTP request. This flaw allows an attacker to poison a web-cache, perform an XSS attack, or obtain sensitive information from request 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 4.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-10687.json
epss 0.00123 https://api.first.org/data/v1/epss?cve=CVE-2020-10687
epss 0.00123 https://api.first.org/data/v1/epss?cve=CVE-2020-10687
epss 0.00123 https://api.first.org/data/v1/epss?cve=CVE-2020-10687
epss 0.00123 https://api.first.org/data/v1/epss?cve=CVE-2020-10687
cvssv3.1 4.8 https://bugzilla.redhat.com/show_bug.cgi?id=1785049
generic_textual MODERATE https://bugzilla.redhat.com/show_bug.cgi?id=1785049
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-p9w3-gwc2-cr49
cvssv3.1 4.8 https://lists.apache.org/thread.html/r6603513ea8afbf6857fd77ca5888ec8385d0af493baa4250e28c351c@%3Cdev.cxf.apache.org%3E
generic_textual MODERATE https://lists.apache.org/thread.html/r6603513ea8afbf6857fd77ca5888ec8385d0af493baa4250e28c351c@%3Cdev.cxf.apache.org%3E
cvssv3.1 4.8 https://nvd.nist.gov/vuln/detail/CVE-2020-10687
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2020-10687
cvssv3.1 4.8 https://security.netapp.com/advisory/ntap-20220210-0015
generic_textual MODERATE https://security.netapp.com/advisory/ntap-20220210-0015
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-10687.json
https://api.first.org/data/v1/epss?cve=CVE-2020-10687
https://lists.apache.org/thread.html/r6603513ea8afbf6857fd77ca5888ec8385d0af493baa4250e28c351c@%3Cdev.cxf.apache.org%3E
https://nvd.nist.gov/vuln/detail/CVE-2020-10687
https://security.netapp.com/advisory/ntap-20220210-0015
https://security.netapp.com/advisory/ntap-20220210-0015/
1785049 https://bugzilla.redhat.com/show_bug.cgi?id=1785049
GHSA-p9w3-gwc2-cr49 https://github.com/advisories/GHSA-p9w3-gwc2-cr49
RHSA-2020:3192 https://access.redhat.com/errata/RHSA-2020:3192
RHSA-2020:3461 https://access.redhat.com/errata/RHSA-2020:3461
RHSA-2020:3462 https://access.redhat.com/errata/RHSA-2020:3462
RHSA-2020:3463 https://access.redhat.com/errata/RHSA-2020:3463
RHSA-2020:3464 https://access.redhat.com/errata/RHSA-2020:3464
RHSA-2020:3501 https://access.redhat.com/errata/RHSA-2020:3501
RHSA-2020:3637 https://access.redhat.com/errata/RHSA-2020:3637
RHSA-2020:3638 https://access.redhat.com/errata/RHSA-2020:3638
RHSA-2020:3639 https://access.redhat.com/errata/RHSA-2020:3639
RHSA-2020:3642 https://access.redhat.com/errata/RHSA-2020:3642
RHSA-2021:0872 https://access.redhat.com/errata/RHSA-2021:0872
RHSA-2021:0873 https://access.redhat.com/errata/RHSA-2021:0873
RHSA-2021:0874 https://access.redhat.com/errata/RHSA-2021:0874
RHSA-2021:0885 https://access.redhat.com/errata/RHSA-2021:0885
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-10687.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:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://bugzilla.redhat.com/show_bug.cgi?id=1785049
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:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://lists.apache.org/thread.html/r6603513ea8afbf6857fd77ca5888ec8385d0af493baa4250e28c351c@%3Cdev.cxf.apache.org%3E
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:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-10687
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:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://security.netapp.com/advisory/ntap-20220210-0015
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 0.30964
EPSS Score 0.00123
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T21:20:18.020770+00:00 Debian Importer Import https://security-tracker.debian.org/tracker/data/json 38.6.0