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CVE-2021-44138

42
FAUCET Score

CVE-2021-44138 is a directory traversal vulnerability affecting Caucho Resin versions 4.0.52 through 4.0.56. This flaw allows remote, unauthenticated attackers to read arbitrary files on the server by injecting a semicolon (;) into a pathname within an HTTP request. With a CVSS score of 7.5 (HIGH), this vulnerability is easily exploitable over the network with no user interaction, leading to high confidentiality impact. While there is no evidence of active exploitation or Metasploit modules, Nuclei templates exist, and its high EPSS score suggests a significant likelihood of future exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
>= 4.0.52, <= 4.0.56CPE matchmatch criteria
cpe:2.3:a:caucho:resin:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
14.12%
Probability of exploitation in next 30 days
EPSS Percentile
96.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Nuclei: CVE-2021-44138 · Jun 9, 2023
This CVE's current EPSS score of 0.1411 is in the 94th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 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

Vendor Advisories (1)

mavenGHSA-4w2q-9hp2-vxj5high

Path Traversal in Caucho Resin

Apr 5, 2022

References

github.com / maybe-why-not/reponame/issues/2
ExploitThird Party Advisory