CVE-2001-1563: Unknown vulnerability in Tomcat 3.2.1 running on HP Secure OS for Linux 1.0 allows attackers to access servlet

This month

HIGH 7.5WATCHLISTDOWNGRADEMITIGATE

CVE-2001-1563 is a high-severity flaw (CVSS 7.5) affecting tomcat, secure os. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unknown vulnerability in Tomcat 3.2.1 running on HP Secure OS for Linux 1.0 allows attackers to access servlet resources. NOTE: due to the vagueness of the vendor advisory, it is not clear whether this issue is already covered by other CVE identifiers.

Why this priority

High severity
EPSS top 8%: very likely to be exploited
On your watchlist

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	4.9% (top 8%)
CISA exploited list	No
Published	2001-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: apache · hp

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

Am I affected?

Timeline

2001-12-31 05:00 UTCPublished CVE record published
2026-06-16 21:56 UTCUpdated Record last modified

apache tomcat DOWNGRADE

Affected: 3.2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.2.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.2.1 (Debian / Ubuntu)

apt-cache madison tomcat sudo apt install tomcat=<VERSION_BEFORE_3.2.1> sudo apt-mark hold tomcat

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

dnf --showduplicates list tomcat sudo dnf downgrade tomcat-<VERSION_BEFORE_3.2.1> sudo dnf versionlock add tomcat

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.

hp secure os MITIGATE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2001-1563?

tomcat: downgrade or apply the listed mitigation; secure os: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2001-1563 being exploited?

CVE-2001-1563 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-2001-1563 affect?

CVE-2001-1563 affects tomcat, secure os. Severity is high (CVSS 7.5). Unknown vulnerability in Tomcat 3.2.1 running on HP Secure OS for Linux 1.0 allows attackers to access servlet resources. NOTE: due to the vagueness of the vendor advisory, it is not clear whether this issue is already covered by other CVE

How urgent is CVE-2001-1563?

Priority 54/100. High severity; EPSS top 8%: very likely to be exploited; On your watchlist

Software pages

Apache Tomcat vulnerabilities

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References

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