CVE-2004-1101: mailpost.exe in MailPost 5.1.1sv, and possibly earlier versions, allows remote attackers to cause a denial of

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MEDIUM 5.8DOWNGRADE

CVE-2004-1101 is a medium-severity flaw (CVSS 5.8) affecting mailpost. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

mailpost.exe in MailPost 5.1.1sv, and possibly earlier versions, allows remote attackers to cause a denial of service (server crash), leak sensitive pathname information in the resulting error message, and execute a cross-site scripting (XSS) attack via an HTTP request that contains a / (backslash) and arbitrary webscript before the requested file, which leaks the pathname and does not quote the script in the resulting Visual Basic error message.

Why this priority

EPSS top 7%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	5.8 (Medium)
EPSS exploit chance	6.0% (top 7%)
CISA exploited list	No
Published	2005-01-10
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: tips

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

Am I affected?

Timeline

2005-01-10 05:00 UTCPublished CVE record published
2026-06-16 22:07 UTCUpdated Record last modified

tips mailpost DOWNGRADE

Affected: 5.1.1_sv

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.1.1_sv

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.1.1_sv (Debian / Ubuntu)

apt-cache madison mailpost sudo apt install mailpost=<VERSION_BEFORE_5.1.1_sv> sudo apt-mark hold mailpost

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

dnf --showduplicates list mailpost sudo dnf downgrade mailpost-<VERSION_BEFORE_5.1.1_sv> sudo dnf versionlock add mailpost

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: TIPS MailPost 5.1.1 - Error Message Cross-Site Scripting

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-2004-1101?

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

Is CVE-2004-1101 being exploited?

CVE-2004-1101 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-2004-1101 affect?

CVE-2004-1101 affects mailpost. Severity is medium (CVSS 5.8). mailpost.exe in MailPost 5.1.1sv, and possibly earlier versions, allows remote attackers to cause a denial of service (server crash), leak sensitive pathname information in the resulting error message, and execute a cross-site scripting (XS

How urgent is CVE-2004-1101?

Priority 49/100. EPSS top 7%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2004-1103 MEDIUM 5.0 DOWNGRADE MailPost 5.1.1sv, and possibly earlier versions, when debug mode is enabled, allows remote attackers to gain s
CVE-2004-1102 MEDIUM 5.0 DOWNGRADE MailPost 5.1.1sv, and possibly earlier versions, displays a different error message depending on whether the r
CVE-2004-1100 MEDIUM 6.8 DOWNGRADE Cross-site scripting (XSS) vulnerability in mailpost.exe in MailPost 5.1.1sv, and possibly earlier versions, w

References

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