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CVE-2016-6866

20
FAUCET Score

CVE-2016-6866 describes a high-severity vulnerability in slock, affecting Fedora and Suckless slock, where an attacker can bypass the screen lock. This is achieved by providing an invalid password hash, leading to a NULL pointer dereference and a denial of service (crash). The vulnerability has a CVSS score of 7.5, indicating a network-exploitable flaw with low attack complexity and high impact on availability, but no impact on confidentiality or integrity. There is no evidence of active exploitation, publicly available exploit code (Metasploit, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.3CPE matchmatch criteria
cpe:2.3:a:suckless:slock:*:*:*:*:*:*:*:*
24CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:24:*:*:*:*:*:*:*
25CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:25:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.89%
Probability of exploitation in next 30 days
EPSS Percentile
85.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0289 is in the 74th percentile among its peer group of 51,485 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, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

git.suckless.org / slock/commit
PatchVendor Advisory
s1m0n.dft-labs.eu / files/slock/slock.txt
Third Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/2FYPV6QQPPYBL3Z2BYNYEJB67FSC55OR
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/RZPEJQNVODYSI4WQXM5GQKXRO7TPK2VG
openwall.com / lists/oss-security/2016/08/18/22
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2016/08/18/24
Mailing ListThird Party Advisory
securityfocus.com / bid/92546
Third Party AdvisoryVDB Entry