CVE-2021-38172

Exp

perM 0.4.0 has a Buffer Overflow related to strncpy. (Debian initially fixed this in 0.4.0-7.)

Published: 2022-02-05 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-38172 is rated High Exploit Risk (80/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.17%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-2021-38172

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-38172

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 2.25% 1.17% -1.08%
2 2025-03-29 1.17% 2.25% +1.08%
3 2025-03-17 — 1.17% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-38172

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]
7.5 2.0 HIGH
AV:N/AC:L/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:L)
Exploitation conditions are straightforward and predictable.
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.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2021-38172

OS Trackers for CVE-2021-38172

vendor priority summary link
ubuntu medium CVE-2021-38172 medium priority: Ubuntu including 1 source packages (perm), 14 status rows across 14 suites (bionic, focal, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): ignored 7, needs-triage 7. https://ubuntu.com/security/CVE-2021-38172

Affected software / configurations for CVE-2021-38172

Vendor Product Version Raw CPE
debian perm 0.4.0 cpe:2.3:a:debian:perm:0.4.0:*:*:*:*:*:*:*

References for CVE-2021-38172

URL Tags
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=993019 Exploit Vendor Advisory
https://lists.debian.org/debian-med/2021/08/msg00016.html Mailing List Vendor Advisory
https://packages.qa.debian.org/p/perm.html Issue Tracking Patch Vendor Advisory
https://salsa.debian.org/med-team/perm/-/commits/master/ Patch Vendor Advisory
https://tracker.debian.org/pkg/perm Issue Tracking Patch Vendor Advisory
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