Medium severity6.5NVD Advisory· Published Sep 2, 2016· Updated May 6, 2026
CVE-2016-0772
CVE-2016-0772
Description
The smtplib library in CPython (aka Python) before 2.7.12, 3.x before 3.4.5, and 3.5.x before 3.5.2 does not return an error when StartTLS fails, which might allow man-in-the-middle attackers to bypass the TLS protections by leveraging a network position between the client and the registry to block the StartTLS command, aka a "StartTLS stripping attack."
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
18- hg.python.org/cpython/rev/b3ce713fb9benvdPatch
- hg.python.org/cpython/rev/d590114c2394nvdPatch
- bugzilla.redhat.com/show_bug.cginvdIssue TrackingThird Party Advisory
- www.openwall.com/lists/oss-security/2016/06/14/9nvdMailing List
- docs.python.org/3.4/whatsnew/changelog.htmlnvdRelease Notes
- docs.python.org/3.5/whatsnew/changelog.htmlnvdRelease Notes
- hg.python.org/cpython/raw-file/v2.7.12/Misc/NEWSnvdRelease Notes
- lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.htmlnvd
- rhn.redhat.com/errata/RHSA-2016-1626.htmlnvd
- rhn.redhat.com/errata/RHSA-2016-1627.htmlnvd
- rhn.redhat.com/errata/RHSA-2016-1628.htmlnvd
- rhn.redhat.com/errata/RHSA-2016-1629.htmlnvd
- rhn.redhat.com/errata/RHSA-2016-1630.htmlnvd
- www.securityfocus.com/bid/91225nvd
- www.splunk.com/view/SP-CAAAPSVnvd
- www.splunk.com/view/SP-CAAAPUEnvd
- lists.debian.org/debian-lts-announce/2019/02/msg00011.htmlnvd
- security.gentoo.org/glsa/201701-18nvd
News mentions
0No linked articles in our index yet.