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CVE-2019-4520

25
FAUCET Score

CVE-2019-4520 describes an inadequate account lockout setting in IBM Security Directory Server 6.4.0, allowing remote attackers to brute force user credentials. With a CVSS score of 7.5 (HIGH), this vulnerability is easily exploitable over the network without user interaction, potentially leading to unauthorized access to sensitive information. While no public exploit code or active exploitation has been observed, and community discussion is minimal, the weakness in authentication mechanisms (CWE-307) presents a clear risk.

Impacted Technologies

VendorProductVersion(s)CPE
6.4.0CPE matchmatch criteria
cpe:2.3:a:ibm:security_directory_server:6.4.0:*:*:*:*:*:*:*

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:H/I:N/A:N

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

Exploit Intelligence

EPSS Score
2.22%
Probability of exploitation in next 30 days
EPSS Percentile
80.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0222 is in the 66th percentile among its peer group of 51,466 CVEs.

Social Chatter

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

exchange.xforce.ibmcloud.com / vulnerabilities/165178
VDB EntryVendor Advisory
ibm.com / support/pages/node/1077045
PatchVendor Advisory