BlackTreeIndependent security intelligence
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Full vulnerability report · 2020
CVE-2019-20445High confidence

HttpObjectDecoder.java in Netty before 4.1.44 allows a Content-Length header to be accompanied by a second Content-Length header, or by a Transfer-Encoding header

n/a · n/a

9.1CriticalCVSS 3.1
Recommended action
Within 72 hours

Critical technical impact with a remotely reachable, unauthenticated path and a public exploit reference; no CISA KEV confirmation is currently recorded.

Patch available
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2020-0308

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 72 hours

Critical technical impact with a remotely reachable, unauthenticated path and a public exploit reference; no CISA KEV confirmation is currently recorded.

Patch available
01

What, why and how

HttpObjectDecoder.java in Netty before 4.1.44 allows a Content-Length header to be accompanied by a second Content-Length header, or by a Transfer-Encoding header.

What

HttpObjectDecoder.java in Netty before 4.1.44 allows a Content-Length header to be accompanied by a second Content-Length header, or by a Transfer-Encoding header.

Why

The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

HttpObjectDecoder.java in Netty before 4.1.44 allows a Content-Length header to be accompanied by a second Content-Length header, or by a Transfer-Encoding header.

Why

The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
a network path → Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-444

CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling'). The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-444Public exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

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Official advisory
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Official advisory
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Official advisory
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d?id=CVE-2019-14893 Référence CVE CVE-2019-16335 https://www.cve.org/CVERecord?id=CVE-2019-16335 Référence CVE CVE-2019-16869 https://www.cve.org/CVERecord?id=CVE-2019-16869 Référence CVE CVE-2019-16942 https://www.cve.org/CVERecord?id=CVE-2019-16942 Référence CVE CVE-2019-16943 https://www.cve.org/CVERecord?id=CVE-2019-16943 Référence CVE CVE-2019-17267 https://www.cve.org/CVERecord?id=CVE-2019-17267 Référence CVE CVE-2019-17531 https://www.cve.org/CVERecord?id=CVE-2019-17531 Référence CVE CVE-2019-20330 https://www.cve.org/CVERecord?id=CVE-2019-20330 Référence CVE CVE-2019-20444 https://www.cve.org/CVERecord?id=CVE-2019-20444 Référence CVE CVE-2019-20445 https://www.cve.org/CVERecord?id=CVE-2019-20445 Référence CVE CVE-2020-10650 https://www.cve.org/CVERecord?id=CVE-2020-10650 Référence CVE CVE-2020-10672 https://www.cve.org/CVERecord?id=CVE-2020-10672 Référence CVE CVE-2020-10673 https://www.cve.org/CVERecord?id=CVE-2020-10673 Référence CVE CVE-2020-11619 https://www.cve.org/CVERecord?id=CVE-2020-11619 Référence CVE CVE-2020-11620 https://www.cve.org/CVERecord?id=CVE-2020-11620 Référence CVE CVE-2020-13949 https://www.cve.org/CVERecord?id=CVE-2020-13949 Référence CVE CVE-2020-14060 https://www.cve.org/CVERecord?id=CVE-2020-14060 Référence CVE CVE-2020-14061 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2026-AVI-0500Multiples vulnérabilités dans VMware Tanzu

d?id=CVE-2019-14540 Référence CVE CVE-2019-14892 https://www.cve.org/CVERecord?id=CVE-2019-14892 Référence CVE CVE-2019-16335 https://www.cve.org/CVERecord?id=CVE-2019-16335 Référence CVE CVE-2019-16942 https://www.cve.org/CVERecord?id=CVE-2019-16942 Référence CVE CVE-2019-16943 https://www.cve.org/CVERecord?id=CVE-2019-16943 Référence CVE CVE-2019-17267 https://www.cve.org/CVERecord?id=CVE-2019-17267 Référence CVE CVE-2019-17531 https://www.cve.org/CVERecord?id=CVE-2019-17531 Référence CVE CVE-2019-20330 https://www.cve.org/CVERecord?id=CVE-2019-20330 Référence CVE CVE-2019-20444 https://www.cve.org/CVERecord?id=CVE-2019-20444 Référence CVE CVE-2019-20445 https://www.cve.org/CVERecord?id=CVE-2019-20445 Référence CVE CVE-2020-10650 https://www.cve.org/CVERecord?id=CVE-2020-10650 Référence CVE CVE-2020-10672 https://www.cve.org/CVERecord?id=CVE-2020-10672 Référence CVE CVE-2020-10673 https://www.cve.org/CVERecord?id=CVE-2020-10673 Référence CVE CVE-2020-10968 https://www.cve.org/CVERecord?id=CVE-2020-10968 Référence CVE CVE-2020-10969 https://www.cve.org/CVERecord?id=CVE-2020-10969 Référence CVE CVE-2020-11111 https://www.cve.org/CVERecord?id=CVE-2020-11111 Référence CVE CVE-2020-11112 https://www.cve.org/CVERecord?id=CVE-2020-11112 Référence CVE CVE-2020-11113 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2025-AVI-0661Multiples vulnérabilités dans les produits Splunk

d?id=CVE-2019-14439 Référence CVE CVE-2019-14540 https://www.cve.org/CVERecord?id=CVE-2019-14540 Référence CVE CVE-2019-14892 https://www.cve.org/CVERecord?id=CVE-2019-14892 Référence CVE CVE-2019-16335 https://www.cve.org/CVERecord?id=CVE-2019-16335 Référence CVE CVE-2019-16869 https://www.cve.org/CVERecord?id=CVE-2019-16869 Référence CVE CVE-2019-16943 https://www.cve.org/CVERecord?id=CVE-2019-16943 Référence CVE CVE-2019-17267 https://www.cve.org/CVERecord?id=CVE-2019-17267 Référence CVE CVE-2019-17531 https://www.cve.org/CVERecord?id=CVE-2019-17531 Référence CVE CVE-2019-20444 https://www.cve.org/CVERecord?id=CVE-2019-20444 Référence CVE CVE-2019-20445 https://www.cve.org/CVERecord?id=CVE-2019-20445 Référence CVE CVE-2019-9674 https://www.cve.org/CVERecord?id=CVE-2019-9674 Référence CVE CVE-2020-10650 https://www.cve.org/CVERecord?id=CVE-2020-10650 Référence CVE CVE-2020-36189 https://www.cve.org/CVERecord?id=CVE-2020-36189 Référence CVE CVE-2020-36518 https://www.cve.org/CVERecord?id=CVE-2020-36518 Référence CVE CVE-2021-20190 https://www.cve.org/CVERecord?id=CVE-2021-20190 Référence CVE CVE-2021-21290 https://www.cve.org/CVERecord?id=CVE-2021-21290 Référence CVE CVE-2021-21295 https://www.cve.org/CVERecord?id=CVE-2021-21295 Référence CVE CVE-2021-21409 https://www.cve.org/CVERecord?id=CV

Official advisory
CERT-FR · French · CERTFR-2025-AVI-0106Multiples vulnérabilités dans les produits IBM

rt/pages/node/7182696 Référence CVE CVE-2016-2193 https://www.cve.org/CVERecord?id=CVE-2016-2193 Référence CVE CVE-2017-15010 https://www.cve.org/CVERecord?id=CVE-2017-15010 Référence CVE CVE-2018-20346 https://www.cve.org/CVERecord?id=CVE-2018-20346 Référence CVE CVE-2018-20505 https://www.cve.org/CVERecord?id=CVE-2018-20505 Référence CVE CVE-2018-20506 https://www.cve.org/CVERecord?id=CVE-2018-20506 Référence CVE CVE-2019-12900 https://www.cve.org/CVERecord?id=CVE-2019-12900 Référence CVE CVE-2019-16869 https://www.cve.org/CVERecord?id=CVE-2019-16869 Référence CVE CVE-2019-20444 https://www.cve.org/CVERecord?id=CVE-2019-20444 Référence CVE CVE-2019-20445 https://www.cve.org/CVERecord?id=CVE-2019-20445 Référence CVE CVE-2019-20478 https://www.cve.org/CVERecord?id=CVE-2019-20478 Référence CVE CVE-2019-9020 https://www.cve.org/CVERecord?id=CVE-2019-9020 Référence CVE CVE-2019-9021 https://www.cve.org/CVERecord?id=CVE-2019-9021 Référence CVE CVE-2019-9023 https://www.cve.org/CVERecord?id=CVE-2019-9023 Référence CVE CVE-2019-9638 https://www.cve.org/CVERecord?id=CVE-2019-9638 Référence CVE CVE-2019-9639 https://www.cve.org/CVERecord?id=CVE-2019-9639 Référence CVE CVE-2019-9641 https://www.cve.org/CVERecord?id=CVE-2019-9641 Référence CVE CVE-2020-20703 https://www.cve.org/CVERecord?id=CVE-2020-207

Official advisory
CERT-FR · French · CERTFR-2025-AVI-0021Multiples vulnérabilités dans les produits IBM

port/pages/node/7180450 Référence CVE CVE-2014-0193 https://www.cve.org/CVERecord?id=CVE-2014-0193 Référence CVE CVE-2015-2156 https://www.cve.org/CVERecord?id=CVE-2015-2156 Référence CVE CVE-2019-10172 https://www.cve.org/CVERecord?id=CVE-2019-10172 Référence CVE CVE-2019-10202 https://www.cve.org/CVERecord?id=CVE-2019-10202 Référence CVE CVE-2019-10768 https://www.cve.org/CVERecord?id=CVE-2019-10768 Référence CVE CVE-2019-14863 https://www.cve.org/CVERecord?id=CVE-2019-14863 Référence CVE CVE-2019-16869 https://www.cve.org/CVERecord?id=CVE-2019-16869 Référence CVE CVE-2019-20444 https://www.cve.org/CVERecord?id=CVE-2019-20444 Référence CVE CVE-2019-20445 https://www.cve.org/CVERecord?id=CVE-2019-20445 Référence CVE CVE-2020-7238 https://www.cve.org/CVERecord?id=CVE-2020-7238 Référence CVE CVE-2020-7676 https://www.cve.org/CVERecord?id=CVE-2020-7676 Référence CVE CVE-2021-21290 https://www.cve.org/CVERecord?id=CVE-2021-21290 Référence CVE CVE-2021-21295 https://www.cve.org/CVERecord?id=CVE-2021-21295 Référence CVE CVE-2021-32036 https://www.cve.org/CVERecord?id=CVE-2021-32036 Référence CVE CVE-2021-32040 https://www.cve.org/CVERecord?id=CVE-2021-32040 Référence CVE CVE-2021-43797 https://www.cve.org/CVERecord?id=CVE-2021-43797 Référence CVE CVE-2021-46939 https://www.cve.org/CVERecord?id=CVE-

Official advisory
CERT-FR · French · CERTFR-2024-AVI-0031Multiples vulnérabilités dans les produits IBM

/6830983 Bulletin de sécurité IBM 6831007 du 05 janvier 2024 https://www.ibm.com/support/pages/node/6831007 Bulletin de sécurité IBM 6831013 du 05 janvier 2024 https://www.ibm.com/support/pages/node/6831013 Bulletin de sécurité IBM 7062347 du 11 janvier 2024 https://www.ibm.com/support/pages/node/7062347 Bulletin de sécurité IBM 7105500 du 06 janvier 2024 https://www.ibm.com/support/pages/node/7105500 Référence CVE CVE-2018-17196 https://www.cve.org/CVERecord?id=CVE-2018-17196 Référence CVE CVE-2019-16869 https://www.cve.org/CVERecord?id=CVE-2019-16869 Référence CVE CVE-2019-20444 https://www.cve.org/CVERecord?id=CVE-2019-20444 Référence CVE CVE-2019-20445 https://www.cve.org/CVERecord?id=CVE-2019-20445 Référence CVE CVE-2019-9518 https://www.cve.org/CVERecord?id=CVE-2019-9518 Référence CVE CVE-2020-11612 https://www.cve.org/CVERecord?id=CVE-2020-11612 Référence CVE CVE-2020-7238 https://www.cve.org/CVERecord?id=CVE-2020-7238 Référence CVE CVE-2021-21290 https://www.cve.org/CVERecord?id=CVE-2021-21290 Référence CVE CVE-2021-21295 https://www.cve.org/CVERecord?id=CVE-2021-21295 Référence CVE CVE-2021-21409 https://www.cve.org/CVERecord?id=CVE-2021-21409 Référence CVE CVE-2021-25741 https://www.cve.org/CVERecord?id=CVE-2021-25741 Référence CVE CVE-2021-37136 https://www.cve.org/CVERecord?id=CVE-

Official advisory
CERT-FR · French · CERTFR-2022-AVI-113Multiples vulnérabilités dans les produits NetApp

De multiples vulnérabilités ont été découvertes dans les produits NetApp. Elles permettent à un attaquant de provoquer une atteinte à l'intégrité des données et une atteinte à la confidentialité des données.

Official advisory
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
n/a
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 29 Jan 2020 · Last source change 5 Aug 2024, 02:39 UTC · CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

CVE recordCVE.org · 5.1
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2020-0308
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceNIST NVD
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2019-20445 · cve.blacktree.nl