CVE-2017-8900
LightDM through 1.22.0, when systemd is used in Ubuntu 16.10 and 17.x, allows physically proximate attackers to bypass intended AppArmor restrictions and visit the home directories of arbitrary users by establishing a guest session.
Does this matter?
Lower severity and a low EPSS score (0.42%). Track it; it rarely justifies an emergency change on its own.
Description
LightDM through 1.22.0, when systemd is used in Ubuntu 16.10 and 17.x, allows physically proximate attackers to bypass intended AppArmor restrictions and visit the home directories of arbitrary users by establishing a guest session.
- CVSS 3.0
- 4.6 MEDIUMCVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 0.42% probability · 36th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- lightdm project/lightdm
- Source
- cve@mitre.org
EPSS 0.4% 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/98554Third Party Advisory, VDB Entry
- https://launchpad.net/bugs/1663157Issue Tracking, Patch, Vendor Advisory
- https://people.canonical.com/~ubuntu-security/cve/2017/CVE-2017-8900.htmlPatch, Vendor Advisory
- https://www.ubuntu.com/usn/usn-3285-1/Patch, Vendor Advisory
- http://www.securityfocus.com/bid/98554Third Party Advisory, VDB Entry
- https://launchpad.net/bugs/1663157Issue Tracking, Patch, Vendor Advisory
- https://people.canonical.com/~ubuntu-security/cve/2017/CVE-2017-8900.htmlPatch, Vendor Advisory
- https://www.ubuntu.com/usn/usn-3285-1/Patch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.