CVE catalog

CVE-2020-10687

DEBIAN-

[CVE catalog]

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.

Severity
Medium · CVSS 4.8CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Published
Updated
Source
[NVD] · [CVE record]
EPSS
1.23% · Oct 27, 2026

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Distribution / releasePackageVersionStatusSource
Debian14undertow1.3.11-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.3.16-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.3.19-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.3.21-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.3.23-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.3.4-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.3.5-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.3.7-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.4.0-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.4.1-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.4.18-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.4.20-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]

Showing 12 observations. All 36 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence
Distribution / releasePackageVersionStatusSource
Debian14undertow1.3.11-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.3.16-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.3.19-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.3.21-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.3.23-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.3.4-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.3.5-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.3.7-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.4.0-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.4.1-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.4.18-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.4.20-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.4.21-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.4.21-2UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.4.22-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.4.23-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.4.23-2UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.4.23-3UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.4.25-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.4.25-2UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.4.3-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.4.4-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.4.6-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.4.7-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow1.4.8-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow2.0.23-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow2.0.25-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow2.0.26-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow2.0.27-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow2.0.28-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow2.0.29-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow2.0.30-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow2.1.0-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow2.1.1-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow2.1.3-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Debian14undertow2.2.0-1UnknownSource applicability is not established[DEBIAN-CVE-2020-10687]
Original provider fields
{
  "package_releases": [],
  "fixed_versions": [],
  "distribution_packages": [
    {
      "name": "undertow",
      "distro": "debian",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.0-1"
            }
          ]
        }
      ],
      "release": "14",
      "versions": [
        "1.3.11-1",
        "1.3.16-1",
        "1.3.19-1",
        "1.3.21-1",
        "1.3.23-1",
        "1.3.4-1",
        "1.3.5-1",
        "1.3.7-1",
        "1.4.0-1",
        "1.4.1-1",
        "1.4.18-1",
        "1.4.20-1",
        "1.4.21-1",
        "1.4.21-2",
        "1.4.22-1",
        "1.4.23-1",
        "1.4.23-2",
        "1.4.23-3",
        "1.4.25-1",
        "1.4.25-2",
        "1.4.3-1",
        "1.4.4-1",
        "1.4.6-1",
        "1.4.7-1",
        "1.4.8-1",
        "2.0.23-1",
        "2.0.25-1",
        "2.0.26-1",
        "2.0.27-1",
        "2.0.28-1",
        "2.0.29-1",
        "2.0.30-1",
        "2.1.0-1",
        "2.1.1-1",
        "2.1.3-1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/DEBIAN-CVE-2020-10687",
      "fixed_version": "2.2.0-1",
      "provider_source": "pypi",
      "provider_record_id": "DEBIAN-CVE-2020-10687",
      "provider_updated_at": "2026-10-26T12:01:11.801878168Z",
      "applicability_unknown": true
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

Observed:

References

[FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]