Caucho Resin resin-doc Unauthenticated Path Traversal via jndi-appconfig Servlet

published 2026-09-18 52 d ago modified 2026-10-27 13 d ago also EUVD-2017-19014

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.2%; EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits: 0; none known

Caucho Resin contains a path traversal vulnerability in the documentation webapp (resin-doc) that allows remote unauthenticated attackers to read arbitrary files by supplying a relative path through the inputFile request parameter of the jndi-appconfig tutorial servlet. Attackers can craft requests with directory traversal sequences to the servlet endpoint to read files outside the intended tutorial directory on the underlying system. Exploitation evidence was first observed by the Shadowserver Foundation on 2021-12-10.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-20284 updated 2026-11-05 cvss 7.5

Resin: Resin: Unauthenticated Path Traversal Vulnerability Leads to Information Disclosure

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: partial
Assessed: 52 d ago (2026-09-18)

Exploit prediction

1.17% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

blkstone.github.io https://blkstone.github.io/2017/10/30/resin-attack-vectors/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	8.7	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA	4.0	8.7	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

Caucho Technology, Inc. Resin

Classification

Weakness

CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

blkstone.github.io /2017/10/30/resin-attack-vectors/
exploit
raw.githubusercontent.com /projectdiscovery/nuclei-templates/main/http/vulnerabilities/chanjet-tplus/chanjet-crm-sqli.yaml
technical-description
caucho.com /products/resin
product
vulncheck.com /advisories/caucho-resin-resin-doc-unauthenticated-path-traversal-via-jndi-appconfig-servlet
third-party-advisory

Sources

CVE List CVE-2017-20284
NVD CVE-2017-20284

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary