Security restrictions bypass in Go programming language

Published: 2021-09-22
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-29923
Exploitation vector Network
Public exploit N/A
Vulnerable software
Go programming language
Universal components / Libraries / Scripting languages

Vendor Google

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Input validation error

EUVDB-ID: #VU56829

Risk: Medium


CVE-ID: CVE-2021-29923

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No


The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to insufficient validation of user-supplied input in net.ParseIP and net.ParseCIDR, as the Go interpreter does not properly consider extraneous zero characters at the beginning of an IP address octet. A remote attacker can bypass access control that is based on IP addresses, because of unexpected octal interpretation.


Install updates from vendor's website.

Vulnerable software versions

Go programming language: 1.15.8 - 1.15.15, 1.16 - 1.16.7, 1.14.15

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?