CVE-2020-25039

Sylabs Singularity 3.2.0 through 3.6.2 has Insecure Permissions on temporary directories used in fakeroot or user namespace container execution.

Published: 2020-09-16 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-25039 is rated Moderate Risk (61/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.01%). EPSS rose +1.20% over the last day, indicating growing attacker interest. 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-2020-25039

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 2026-06-15 0.81% 2.01% +1.20%
2 2025-11-21 0.91% 0.81% -0.09%
3 2025-11-18 — 0.91% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-25039

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.1 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N 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:L)
A normal user session is enough; they don’t have to be admin.
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:N)
Service keeps running; no real outage angle.
 2.8 5.2 [email protected]
5.5 2.0 MEDIUM
AV:N/AC:L/Au:S/C:P/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.0 4.9 [email protected]

Weakness enumeration for CVE-2020-25039

GitHub Security Advisory for CVE-2020-25039

GHSA-w6v2-qchm-grj7 · Severity: high · Ecosystem: go — Insecure permissions on user namespace / fakeroot temporary rootfs in Singularity

OS Trackers for CVE-2020-25039

vendor priority summary link
alpine high CVE-2020-25039: 1 source package rows (singularity); 9 state rows across 5 repos (3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 5, open 4. https://security.alpinelinux.org/vuln/CVE-2020-25039
debian not yet assigned CVE-2020-25039 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-2020-25039
suse medium CVE-2020-25039 severity moderate: SUSE including 4 source package names (singularity-3.6.3-bp152.2.8.1, singularity-3.6.3-lp151.2.9.1, singularity-3.6.3-lp152.2.6.1, singularity-3.8.3-1.2), 4 product×package rows across 4 product lines (SUSE Package Hub 15 SP2, openSUSE Leap 15.1, openSUSE Leap 15.2, openSUSE Tumbleweed): Fixed 4. https://www.suse.com/security/cve/CVE-2020-25039/
ubuntu medium CVE-2020-25039 medium priority: Ubuntu including 1 source packages (singularity-container), 16 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 10, needs-triage 4, ignored 2. https://ubuntu.com/security/CVE-2020-25039

Affected software / configurations for CVE-2020-25039

Vendor Product Version Raw CPE
sylabs singularity >= 3.2.0, <= 3.6.2 cpe:2.3:a:sylabs:singularity:*:*:*:*:*:*:*:*
opensuse leap 15.1 cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
opensuse leap 15.2 cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*

References for CVE-2020-25039

cvelogic Threat Intelligence