HOME VULNERABILITIESCVE-2019-14809

CRITICAL

CVE-2019-14809

NVD-CWE-noinfoPublished: August 13, 2019· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

net/url in Go before 1.11.13 and 1.12.x before 1.12.8 mishandles malformed hosts in URLs, leading to an authorization bypass in some applications. This is related to a Host field with a suffix appearing in neither Hostname() nor Port(), and is related to a non-numeric port number. For example, an attacker can compose a crafted javascript:// URL that results in a hostname of google.com.

Technical Analysis

CVE-2019-14809 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Debian1 product(s)

debian linux

Go1 product(s)

go

Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/golang/go/issues/29098

PATCHhttps://github.com/golang/go/issues/29098

ADVISORYhttps://seclists.org/bugtraq/2019/Aug/31

ADVISORYhttps://www.debian.org/security/2019/dsa-4503

ADVISORYhttps://seclists.org/bugtraq/2019/Aug/31

ADVISORYhttps://www.debian.org/security/2019/dsa-4503

All References (26)

→

http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00076.html

→

http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00002.html

→

http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00011.html

→

http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00021.html

→

http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00038.html

→

https://access.redhat.com/errata/RHSA-2019:3433

→

https://github.com/golang/go/issues/29098Exploit · Patch · Third Party Advisory

→

https://groups.google.com/forum/#%21topic/golang-announce/0uuMm1BwpHE

→

https://groups.google.com/forum/#%21topic/golang-announce/65QixT3tcmg

→

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4BBP27PZGSY6OP6D26E5FW4GZKBFHNU7/

→

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LYO6E3H34C346D2E443GLXK7OK6KIYIQ/

→

https://seclists.org/bugtraq/2019/Aug/31Mailing List · Third Party Advisory

→

https://www.debian.org/security/2019/dsa-4503Third Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00076.html

→

http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00002.html

Quick Facts

CVE IDCVE-2019-14809

CVSS Score9.8 / 10

SeverityCRITICAL

WeaknessNVD-CWE-noinfo

CISA KEVNo

Affected2 vendor(s)

PublishedAug 13, 2019

Related CVEs (NVD-CWE-noinfo)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2019-14809 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.

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