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 update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-33622 is rated Moderate Risk (61.5/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.55%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-33622

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-03-30 1.06% 0.55% -0.51%
2 2025-03-29 0.55% 1.06% +0.51%
3 2025-03-17 — 0.55% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-33622

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2021-33622

OS Trackers for CVE-2021-33622

vendor priority summary link
alpine critical CVE-2021-33622: 1 source package rows (singularity); 8 state rows across 2 repos (3.22-community, edge-community); fixed 0, open 8. https://security.alpinelinux.org/vuln/CVE-2021-33622
debian not yet assigned CVE-2021-33622 not yet assigned priority: Debian including 1 source packages (singularity-container), 1 status rows across 1 suites (sid): resolved 1. https://security-tracker.debian.org/tracker/CVE-2021-33622
ubuntu medium CVE-2021-33622 medium priority: Ubuntu including 1 source packages (singularity-container), 6 status rows across 6 suites (bionic, jammy, noble, plucky, questing, upstream): not-affected 3, DNE 1, needs-triage 1, released 1. https://ubuntu.com/security/CVE-2021-33622

Affected software / configurations for CVE-2021-33622

Vendor Product Version Raw CPE
sylabs singularity >= 3.5.0, < 3.7.0 cpe:2.3:a:sylabs:singularity:*:*:*:*:*:*:*:*
sylabs singularitypro < 3.5-8 cpe:2.3:a:sylabs:singularitypro:*:*:*:*:*:*:*:*

References for CVE-2021-33622

cvelogic Threat Intelligence