CVE-2001-0743: Paging function in O'Reilly WebBoard Pager 4.10 allows remote attackers to cause a denial of service via a mes

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MEDIUM 5.0DOWNGRADE

CVE-2001-0743 is a medium-severity flaw (CVSS 5.0) affecting webboard. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Paging function in O'Reilly WebBoard Pager 4.10 allows remote attackers to cause a denial of service via a message with an escaped ' character followed by JavaScript commands.

Why this priority

EPSS top 8%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	5.2% (top 8%)
CISA exploited list	No
Published	2001-10-18
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: oreilly

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

Am I affected?

Timeline

2001-10-18 04:00 UTCPublished CVE record published
2026-06-16 21:54 UTCUpdated Record last modified

oreilly webboard DOWNGRADE

Affected: 4.10.30

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.10.30

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.10.30 (Debian / Ubuntu)

apt-cache madison webboard sudo apt install webboard=<VERSION_BEFORE_4.10.30> sudo apt-mark hold webboard

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

dnf --showduplicates list webboard sudo dnf downgrade webboard-<VERSION_BEFORE_4.10.30> sudo dnf versionlock add webboard

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: OReilly Software WebBoard 4.10.30 - Pager Hostile JavaScript

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-2001-0743?

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

Is CVE-2001-0743 being exploited?

CVE-2001-0743 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-2001-0743 affect?

CVE-2001-0743 affects webboard. Severity is medium (CVSS 5.0). Paging function in O'Reilly WebBoard Pager 4.10 allows remote attackers to cause a denial of service via a message with an escaped ' character followed by JavaScript commands.

How urgent is CVE-2001-0743?

Priority 46/100. EPSS top 8%: very likely to be exploited; Public exploit reference

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References

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