CVE catalog

CVE-2020-7238

netty affected and fixed versions

Netty 4.1.43.Final allows HTTP Request Smuggling because it mishandles Transfer-Encoding whitespace (such as a [space]Transfer-Encoding:chunked line) and a later Content-Length header. This issue exists because of an incomplete fix for CVE-2019-16869.

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published: Jan 26, 2020, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 3.65% · Oct 27, 2026

Projects and upstream resources

[netty][Source-reported homepage]

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 / release	Package	Version	Status	Source
Debiantrixie-security	netty	`1:4.1.48-10+deb13u1`	Fixed	[CVE-2020-7238]
Debiantrixie	netty	`1:4.1.45-1`	FixedDistribution-reported fixed boundary	[CVE-2020-7238]
Debiantrixie	netty	`1:4.1.48-10+deb13u1`	Fixed	[CVE-2020-7238]
Debiansid	netty	`1:4.1.45-1`	FixedDistribution-reported fixed boundary	[CVE-2020-7238]
Debiansid	netty	`1:4.1.48-16`	Fixed	[CVE-2020-7238]
Debianforky	netty	`1:4.1.45-1`	FixedDistribution-reported fixed boundary	[CVE-2020-7238]
Debianforky	netty	`1:4.1.48-16`	Fixed	[CVE-2020-7238]
Debianbookworm-security	netty	`1:4.1.48-7+deb12u2`	Fixed	[CVE-2020-7238]
Debianbookworm	netty	`1:4.1.45-1`	FixedDistribution-reported fixed boundary	[CVE-2020-7238]
Debianbookworm	netty	`1:4.1.48-7+deb12u2`	Fixed	[CVE-2020-7238]

Showing 10 fix observations. All 22 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
Debianbookworm	netty	`1:4.1.45-1`	FixedDistribution-reported fixed boundary	[CVE-2020-7238]
Debianbookworm	netty	`1:4.1.48-7+deb12u2`	Fixed	[CVE-2020-7238]
Debianbookworm-security	netty	`1:4.1.48-7+deb12u2`	Fixed	[CVE-2020-7238]
Debianforky	netty	`1:4.1.45-1`	FixedDistribution-reported fixed boundary	[CVE-2020-7238]
Debianforky	netty	`1:4.1.48-16`	Fixed	[CVE-2020-7238]
Debiansid	netty	`1:4.1.45-1`	FixedDistribution-reported fixed boundary	[CVE-2020-7238]
Debiansid	netty	`1:4.1.48-16`	Fixed	[CVE-2020-7238]
Debiantrixie	netty	`1:4.1.45-1`	FixedDistribution-reported fixed boundary	[CVE-2020-7238]
Debiantrixie	netty	`1:4.1.48-10+deb13u1`	Fixed	[CVE-2020-7238]
Debiantrixie-security	netty	`1:4.1.48-10+deb13u1`	Fixed	[CVE-2020-7238]
Ubuntu16.04	netty-3.9	`3.9.0.Final-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-7238]Aug 20, 2026, 12:00:15 AM UTC
Ubuntu16.04	netty-3.9	`3.9.0.Final-1ubuntu0.1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-7238]Aug 20, 2026, 12:00:15 AM UTC
Ubuntupro	netty	`1:4.1.7-4`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-7238]Aug 20, 2026, 12:00:15 AM UTC
Ubuntupro	netty	`1:4.1.7-4ubuntu0.1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-7238]Aug 20, 2026, 12:00:15 AM UTC
Ubuntupro	netty	`1:4.1.7-4ubuntu0.1+esm1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-7238]Aug 20, 2026, 12:00:15 AM UTC
Ubuntupro	netty	`1:4.1.7-4ubuntu0.1+esm2`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-7238]Aug 20, 2026, 12:00:15 AM UTC
Ubuntupro	netty	`1:4.1.7-4ubuntu0.1+esm3`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-7238]Aug 20, 2026, 12:00:15 AM UTC
Ubuntupro	netty	`1:4.1.7-4ubuntu0.1+esm4`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-7238]Aug 20, 2026, 12:00:15 AM UTC
Ubuntupro	netty	`1:4.1.7-4ubuntu0.1+esm5`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-7238]Aug 20, 2026, 12:00:15 AM UTC
Ubuntupro	netty	`1:4.1.7-4ubuntu0.1+esm6`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-7238]Aug 20, 2026, 12:00:15 AM UTC
Ubuntupro	netty	`1:4.1.7-4ubuntu0.1+esm7`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-7238]Aug 20, 2026, 12:00:15 AM UTC
Ubuntupro	netty	`1:4.1.7-4ubuntu0.1~esm1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-7238]Aug 20, 2026, 12:00:15 AM UTC

Original provider fields

{
  "package_releases": [
    {
      "name": "netty",
      "status": "fixed",
      "release": "sid",
      "version": "1:4.1.48-16"
    },
    {
      "name": "netty",
      "status": "fixed",
      "release": "forky",
      "version": "1:4.1.48-16"
    },
    {
      "name": "netty",
      "status": "fixed",
      "release": "trixie",
      "version": "1:4.1.48-10+deb13u1"
    },
    {
      "name": "netty",
      "status": "fixed",
      "release": "trixie-security",
      "version": "1:4.1.48-10+deb13u1"
    },
    {
      "name": "netty",
      "status": "fixed",
      "release": "bookworm",
      "version": "1:4.1.48-7+deb12u2"
    },
    {
      "name": "netty",
      "status": "fixed",
      "release": "bookworm-security",
      "version": "1:4.1.48-7+deb12u2"
    }
  ],
  "fixed_versions": [
    {
      "bug": 950967,
      "name": "netty",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "1:4.1.45-1"
    },
    {
      "bug": 950967,
      "name": "netty",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "1:4.1.45-1"
    },
    {
      "bug": 950967,
      "name": "netty",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "1:4.1.45-1"
    },
    {
      "bug": 950967,
      "name": "netty",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": "1:4.1.45-1"
    }
  ],
  "distribution_packages": [
    {
      "name": "netty",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "1:4.1.7-4",
        "1:4.1.7-4ubuntu0.1~esm1",
        "1:4.1.7-4ubuntu0.1",
        "1:4.1.7-4ubuntu0.1+esm1",
        "1:4.1.7-4ubuntu0.1+esm2",
        "1:4.1.7-4ubuntu0.1+esm3",
        "1:4.1.7-4ubuntu0.1+esm4",
        "1:4.1.7-4ubuntu0.1+esm5",
        "1:4.1.7-4ubuntu0.1+esm6",
        "1:4.1.7-4ubuntu0.1+esm7"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-7238",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2020-7238",
      "provider_updated_at": "2026-08-20T00:00:15.333835136Z",
      "applicability_unknown": true
    },
    {
      "name": "netty-3.9",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.9.0.Final-1ubuntu0.1"
            }
          ]
        }
      ],
      "release": "16.04",
      "versions": [
        "3.9.0.Final-1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-7238",
      "fixed_version": "3.9.0.Final-1ubuntu0.1",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2020-7238",
      "provider_updated_at": "2026-08-20T00:00:15.333835136Z",
      "applicability_unknown": true
    }
  ]
}

[Debian bug #950967]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[libnetty-java]Unknown
Source package: [netty]
Details (4)
- 1:4.1.48-7+deb12u2 · all · bookworm
  Fixed · Fixed: 1:4.1.45-1
  dsa · netty · debian · bookworm; dsa · netty · debian · 12
- 1:4.1.48-7+deb12u2 · all · bookworm
  Fixed · Fixed: 1:4.1.45-1
  dsa · netty · debian · bookworm; dsa · netty · debian · 12
- 1:4.1.48-7+deb12u2 · all · bookworm-security
  Fixed · Fixed: 1:4.1.45-1
  dsa · netty · debian · bookworm; dsa · netty · debian · 12
- 1:4.1.48-7+deb12u2 · all · bookworm-security
  Fixed · Fixed: 1:4.1.45-1
  dsa · netty · debian · bookworm; dsa · netty · debian · 12

[Debian 13 (Trixie)]

[libnetty-java]Unknown
Source package: [netty]
Details (4)
- 1:4.1.48-10+deb13u1 · all · trixie
  Fixed · Fixed: 1:4.1.45-1
  dsa · netty · debian · 13
- 1:4.1.48-10+deb13u1 · all · trixie
  Fixed · Fixed: 1:4.1.45-1
  dsa · netty · debian · 13
- 1:4.1.48-10+deb13u1 · all · trixie-security
  Fixed · Fixed: 1:4.1.45-1
  dsa · netty · debian · 13
- 1:4.1.48-10+deb13u1 · all · trixie-security
  Fixed · Fixed: 1:4.1.45-1
  dsa · netty · debian · 13

Observed: Oct 23, 2026, 5:53:16 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]