CVE-2001-0399: Caucho Resin 1.3b1 and earlier allows remote attackers to read source code for Javabean files by inserting a .

This month

MEDIUM 5.0DOWNGRADE

CVE-2001-0399 is a medium-severity flaw (CVSS 5.0) affecting resin. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Caucho Resin 1.3b1 and earlier allows remote attackers to read source code for Javabean files by inserting a .jsp before the WEB-INF specifier in an HTTP request.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	2.8% (top 13%)
CISA exploited list	No
Published	2001-06-18
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: caucho technology

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2001-06-18 04:00 UTCPublished CVE record published
2026-06-16 21:54 UTCUpdated Record last modified

caucho technology resin DOWNGRADE

Affected: 1.2 · 1.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2

1. Check installed version

apt-cache policy resin || rpm -q resin || resin --version

2. No fixed release: DOWNGRADE to a release before 1.2 (Debian / Ubuntu)

apt-cache madison resin sudo apt install resin=<VERSION_BEFORE_1.2> sudo apt-mark hold resin

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list resin sudo dnf downgrade resin-<VERSION_BEFORE_1.2> sudo dnf versionlock add resin

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Caucho Technology Resin 1.2/1.3 - JavaBean Disclosure

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2001-0399?

resin: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2001-0399 being exploited?

CVE-2001-0399 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2001-0399 affect?

CVE-2001-0399 affects resin. Severity is medium (CVSS 5.0). Caucho Resin 1.3b1 and earlier allows remote attackers to read source code for Javabean files by inserting a .jsp before the WEB-INF specifier in an HTTP request.

How urgent is CVE-2001-0399?

Priority 44/100. Public exploit reference

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References

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