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CVE-2021-41560

36
FAUCET Score

CVE-2021-41560 is a critical arbitrary code execution vulnerability affecting OpenCATS through version 0.9.6, stemming from insecure file upload functionality in lib/FileUtility.php. With a CVSS score of 9.8, this flaw allows unauthenticated remote attackers to execute arbitrary code with high impact on confidentiality, integrity, and availability. Despite its severity and high EPSS score, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.9.6CPE matchmatch criteria
cpe:2.3:a:opencats:opencats:*:*:*:*:*:*:*:*

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
11.13%
Probability of exploitation in next 30 days
EPSS Percentile
95.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.1113 is in the 91st percentile among its peer group of 36,862 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

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / Nickguitar/RevCAT
ExploitPatchThird Party Advisory
github.com / opencats/OpenCATS/commit/b1af3bde1f68bec1c703ad66a3e390f15ed8ebe1
PatchThird Party Advisory
youtu.be / isiDISag7CM
Broken LinkThird Party Advisory