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CVE-2015-8316

17
FAUCET Score

CVE-2015-8316 describes an array index error in LightDM versions 1.14.3 and 1.16.x before 1.16.6, specifically when the XDMCP server is enabled. This flaw allows remote attackers to trigger a denial of service by sending a malformed XDMCP request packet lacking an address, causing the LightDM process to crash. Rated Medium severity (CVSS 5.9), exploitation requires no user interaction and has high availability impact, though it is considered a high attack complexity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
1.14.3CPE matchmatch criteria
cpe:2.3:a:lightdm_project:lightdm:1.14.3:*:*:*:*:*:*:*
1.16CPE matchmatch criteria
cpe:2.3:a:lightdm_project:lightdm:1.16:*:*:*:*:*:*:*
1.16.1CPE matchmatch criteria
cpe:2.3:a:lightdm_project:lightdm:1.16.1:*:*:*:*:*:*:*
1.16.2CPE matchmatch criteria
cpe:2.3:a:lightdm_project:lightdm:1.16.2:*:*:*:*:*:*:*
1.16.3CPE matchmatch criteria
cpe:2.3:a:lightdm_project:lightdm:1.16.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.9MEDIUM

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.75%
Probability of exploitation in next 30 days
EPSS Percentile
75.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0175 is in the 54th percentile among its peer group of 19,954 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

bugs.launchpad.net / lightdm/+bug/1516831
Issue TrackingThird Party AdvisoryVDB Entry
bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party AdvisoryVDB Entry
openwall.com / lists/oss-security/2015/11/22/1
Mailing ListVDB Entry