What is CVE-2021-20349?

CVE-2021-20349 is a medium-severity vulnerability in IBM Tivoli Workload Scheduler, classified under Out-of-bounds Write. CVSS score: 5.3/10. Published 2021-08-09.

How severe is CVE-2021-20349?

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

Buffer overflow in IBM Tivoli Workload Scheduler

CVE-2021-20349

IBM Tivoli Workload Scheduler 9.4 and 9.5 is vulnerable to a stack-based buffer overflow, caused by improper bounds checking. A local attacker could overflow a buffer and gain lower level privileges. IBM X-Force ID: 194599.

Vulnerability class: Buffer Overflow

Published 2021-08-09 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.003 (15.3th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 15.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

IBM Tivoli Workload Scheduler — versions 9.4, 9.5
IBM Workload Scheduler — versions 9.4, 9.5

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

www.ibm.com/support/pages/node/6479347 (Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/194599 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2021-20349?: CVE-2021-20349 is a medium-severity vulnerability in IBM Tivoli Workload Scheduler, classified under Out-of-bounds Write. CVSS score: 5.3/10. Published 2021-08-09.
How severe is CVE-2021-20349?: Medium severity. CVSS v3 base score is 5.3 out of 10.