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CVE-2021-41243

29
FAUCET Score

CVE-2021-41243 describes a potential Zip Slip and OS Command Injection vulnerability in the management system of baserCMS. Authenticated users with file upload privileges can exploit this by uploading specially crafted zip files, leading to arbitrary command execution on the host operating system. This vulnerability carries a high CVSS score of 8.8, indicating a critical risk due to its network-based attack vector, low complexity, and high impact on confidentiality, integrity, and availability. While no active exploitation has been observed, nor are there public exploits available in Metasploit or ExploitDB, the lack of community discussion and media coverage suggests low public awareness.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.5.4CPE matchmatch criteria
cpe:2.3:a:basercms:basercms:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.1CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
3.1
Impact Score
5.3
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.17%
Probability of exploitation in next 30 days
EPSS Percentile
80.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0217 is in the 79th percentile among its peer group of 17,823 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

composerpatch availablevia ghsa
Product: baserproject/basercmsFixed in: 4.5.4
github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-7rpc-9m88-cf9wcritical

OS Command Injection Vulnerability and Potential Zip Slip Vulnerability in baserCMS

Dec 1, 2021

References

github.com / baserproject/basercms/commit/9088b99c329d1faff3a2f1269f37b9a9d8d5f6ff
PatchThird Party Advisory
github.com / baserproject/basercms/security/advisories/GHSA-7rpc-9m88-cf9w
Third Party Advisory