What is CVE-2019-4563?

CVE-2019-4563 is a medium-severity vulnerability in IBM Security Directory Server, classified under Session Fixation. CVSS score: 5.3/10. Published 2020-10-29.

How severe is CVE-2019-4563?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in IBM Security Directory Server

CVE-2019-4563

IBM Security Directory Server 6.4.0 does not set the secure attribute on authorization tokens or session cookies. Attackers may be able to get the cookie values by sending a http:// link to a user or by planting this link in a site the user goes to. The cookie will be sent to the insecure link and the attacker can then obtain the cookie value by snooping the traffic. IBM X-Force ID: 166624.

Published 2020-10-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.009 (60.0th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 60.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

IBM Security Directory Server — versions 6.4.0
IBM Security Directory Server — versions 6.4.0.0

Weakness classification (CWE)

CWE-384 — Session Fixation

References

www.ibm.com/support/pages/node/6356607 (Patch, Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/166624 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2019-4563?: CVE-2019-4563 is a medium-severity vulnerability in IBM Security Directory Server, classified under Session Fixation. CVSS score: 5.3/10. Published 2020-10-29.
How severe is CVE-2019-4563?: Medium severity. CVSS v3 base score is 5.3 out of 10.