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An unintended cleartext issue exists in Go before 1.8.4 and 1.9.x before 1.9.1. RFC 4954 requires that, during SMTP, the PLAIN auth scheme must only be used on network connections secured with TLS. The original implementation of smtp.PlainAuth in Go 1.0 enforced this requirement, and it was documented to do so. In 2013, upstream issue #5184, this was changed so that the server may decide whether PLAIN is acceptable. The result is that if you set up a man-in-the-middle SMTP server that doesn't advertise STARTTLS and does advertise that PLAIN auth is OK, the smtp.PlainAuth implementation sends the username and password.
| Reporter | Title | Published | Views | Family All 59 |
|---|---|---|---|---|
 | Security Bulletin: A security vulnerability has been identified in Go shipped with IBM Cloud Schematics (CVE-2017-15041, CVE-2017-15042) | 17 Jun 201822:33 | – | ibm |
 | Amazon Linux 2 : golang (ALAS-2018-1011) | 11 May 201800:00 | – | nessus |
| Amazon Linux AMI : golang (ALAS-2017-918) | 6 Nov 201700:00 | – | nessus |
| CentOS 7 : golang (CESA-2018:0878) | 27 Apr 201800:00 | – | nessus |
| Fedora 26 : golang (2017-6f1b90dbb7) | 18 Oct 201700:00 | – | nessus |
| Fedora 25 : golang (2017-8f7bca960b) | 20 Oct 201700:00 | – | nessus |
| Fedora 27 : golang (2017-f4fc897e8f) | 15 Jan 201800:00 | – | nessus |
| GLSA-201710-23 : Go: Multiple vulnerabilities | 23 Oct 201700:00 | – | nessus |
| MiracleLinux 7 : golang-1.9.4-1.el7 (AXSA:2018-2885:01) | 16 Jan 202600:00 | – | nessus |
| NewStart CGSL CORE 5.04 / MAIN 5.04 : golang Multiple Vulnerabilities (NS-SA-2019-0047) | 12 Aug 201900:00 | – | nessus |
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03 Sep 2025 22:44Current
7High risk
Vulners AI Score7
CVSS 24.3
CVSS 35.9
EPSS0.00181