What is CVE-2021-33622?

CVE-2021-33622 is a critical-severity vulnerability in Sylabs Singularity, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 9.8/10. Published 2021-06-15.

How severe is CVE-2021-33622?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Sylabs Singularity

CVE-2021-33622

Sylabs Singularity 3.5.x and 3.6.x, and SingularityPRO before 3.5-8, has an Incorrect Check of a Function's Return Value.

Published 2021-06-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.013 (68.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 68.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-754 — Improper Check for Unusual or Exceptional Conditions

References

medium.com/sylabs (Third Party Advisory)
support.sylabs.io/support/solutions/articles/42000087130-3-5-8-security-release… (Vendor Advisory)

Frequently asked questions

What is CVE-2021-33622?: CVE-2021-33622 is a critical-severity vulnerability in Sylabs Singularity, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 9.8/10. Published 2021-06-15.
How severe is CVE-2021-33622?: Critical severity. CVSS v3 base score is 9.8 out of 10.