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CVE-2021-38172

31
FAUCET Score

CVE-2021-38172 is a critical buffer overflow vulnerability (CWE-120) affecting perM 0.4.0, specifically related to the use of strncpy, and impacts Debian perm products. With a CVSS score of 9.8, this vulnerability is easily exploitable over the network with low attack complexity, potentially leading to complete compromise of confidentiality, integrity, and availability. Despite its high severity and FAUCET Risk Score of 80/100, there is currently no public exploit code available (Metasploit, Nuclei, ExploitDB), and it is not listed in CISA's KEV catalog. Furthermore, the vulnerability has garnered minimal community discussion and media coverage, indicating a low level of public awareness or active exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
0.4.0CPE matchmatch criteria
cpe:2.3:a:debian:perm:0.4.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.83%
Probability of exploitation in next 30 days
EPSS Percentile
76.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0183 is in the 65th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

debianvendor investigatingvia nvd_reference
View patch

References

bugs.debian.org / cgi-bin/bugreport.cgi
ExploitVendor Advisory
lists.debian.org / debian-med/2021/08/msg00016.html
Mailing ListVendor Advisory
packages.qa.debian.org / p/perm.html
Issue TrackingPatchVendor Advisory
salsa.debian.org / med-team/perm/-/commits/master
PatchVendor Advisory
tracker.debian.org / pkg/perm
Issue TrackingPatchVendor Advisory