CVE-2001-1100: sendmessage.cgi in W3Mail 1.0.2, and possibly other CGI programs, allows remote attackers to execute arbitrary

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HIGH 7.5DOWNGRADE

CVE-2001-1100 is a high-severity flaw (CVSS 7.5) affecting w3mail. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

sendmessage.cgi in W3Mail 1.0.2, and possibly other CGI programs, allows remote attackers to execute arbitrary commands via shell metacharacters in any field of the 'Compose Message' page.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	3.7% (top 10%)
CISA exploited list	No
Published	2001-10-07
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: spencer miles

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

Am I affected?

Timeline

2001-10-07 04:00 UTCPublished CVE record published
2026-06-16 21:55 UTCUpdated Record last modified

spencer miles w3mail DOWNGRADE

Affected: 1.0.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.2

1. Check installed version

apt-cache policy w3mail || rpm -q w3mail || w3mail --version

2. No fixed release: DOWNGRADE to a release before 1.0.2 (Debian / Ubuntu)

apt-cache madison w3mail sudo apt install w3mail=<VERSION_BEFORE_1.0.2> sudo apt-mark hold w3mail

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

dnf --showduplicates list w3mail sudo dnf downgrade w3mail-<VERSION_BEFORE_1.0.2> sudo dnf versionlock add w3mail

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.

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-2001-1100?

w3mail: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2001-1100 being exploited?

CVE-2001-1100 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-2001-1100 affect?

CVE-2001-1100 affects w3mail. Severity is high (CVSS 7.5). sendmessage.cgi in W3Mail 1.0.2, and possibly other CGI programs, allows remote attackers to execute arbitrary commands via shell metacharacters in any field of the 'Compose Message' page.

How urgent is CVE-2001-1100?

Priority 54/100. High severity; Public exploit reference

Related CVEs

CVE-2002-2399 MEDIUM 6.4 DOWNGRADE Directory traversal vulnerability in viewAttachment.cgi in W3Mail 1.0.6 allows remote attackers to read arbitr
CVE-2002-2331 MEDIUM 5.8 DOWNGRADE W3Mail 1.0.2 through 1.0.5 with server side scripting (SSI) enabled in the attachments directory does not prop

References

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