How severe is CVE-2021-33622?

CVE-2021-33622 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-33622 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33622?

CVE-2021-33622 primarily affects Sylabs Singularity. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-33622?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-33622 published?

CVE-2021-33622 was published on 2021-06-15 and last updated on 2026-06-17.

CVE-2021-33622

CVE-2021-33622 is a critical-severity vulnerability in Sylabs Singularity with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-754.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-754
Affected product: Sylabs Singularity
Published: 2021-06-15
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2021-33622?: CVE-2021-33622 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-33622 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-33622?: CVE-2021-33622 primarily affects Sylabs Singularity. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-33622?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-33622 published?: CVE-2021-33622 was published on 2021-06-15 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:sylabs:singularity:*:*:*:*:*:*:*:*
cpe:2.3:a:sylabs:singularitypro:*:*:*:*:*:*:*:*

More vulnerabilities in Sylabs Singularity

CVE-2021-33027 — Critical (CVSS 9.8): Sylabs Singularity Enterprise through 1.6.2 has Insufficient Entropy in a nonce.
CVE-2020-25040 — High (CVSS 8.8): Sylabs Singularity through 3.6.2 has Insecure Permissions on temporary directories used in explicit and implicit…
CVE-2019-11328 — High (CVSS 8.8): An issue was discovered in Singularity 3.1.0 to 3.2.0-rc2, a malicious user with local/network access to the host…
CVE-2020-15229 — High (CVSS 8.2): Singularity (an open source container platform) from version 3.1.1 through 3.6.3 has a vulnerability. Due to insecure…
CVE-2020-25039 — High (CVSS 8.1): Sylabs Singularity 3.2.0 through 3.6.2 has Insecure Permissions on temporary directories used in fakeroot or user…
CVE-2018-19295 — High (CVSS 7.8): Sylabs Singularity 2.4 to 2.6 allows local users to conduct Improper Input Validation attacks.

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