CVE-2017-15042
An unintended cleartext issue exists in Go before 1.8.4 and 1.9.x before 1.9.1.
Does this matter?
Lower severity and a low EPSS score (1.28%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.0
- 5.9 MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 1.28% probability · 70th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-319
- Affected
- golang/go
- Source
- cve@mitre.org
EPSS 1.3% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/101197Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:3463
- https://access.redhat.com/errata/RHSA-2018:0878
- https://github.com/golang/go/issues/22134Issue Tracking, Patch, Vendor Advisory
- https://golang.org/cl/68023Issue Tracking, Patch, Vendor Advisory
- https://golang.org/cl/68210Vendor Advisory
- https://groups.google.com/d/msg/golang-dev/RinSE3EiJBI/kYL7zb07AgAJMailing List, Vendor Advisory
- https://security.gentoo.org/glsa/201710-23Third Party Advisory
- http://www.securityfocus.com/bid/101197Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:3463
- https://access.redhat.com/errata/RHSA-2018:0878
- https://github.com/golang/go/issues/22134Issue Tracking, Patch, Vendor Advisory
- https://golang.org/cl/68023Issue Tracking, Patch, Vendor Advisory
- https://golang.org/cl/68210Vendor Advisory
- https://groups.google.com/d/msg/golang-dev/RinSE3EiJBI/kYL7zb07AgAJMailing List, Vendor Advisory
- https://security.gentoo.org/glsa/201710-23Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.