CVE-2004-1533: Buffer overflow in pop3svr.exe for DMS POP3 1.5.3.27 and earlier allows remote attackers to cause a denial of

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MEDIUM 5.0DOWNGRADE

CVE-2004-1533 is a medium-severity flaw (CVSS 5.0) affecting pop3 server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in pop3svr.exe for DMS POP3 1.5.3.27 and earlier allows remote attackers to cause a denial of service (service crash) via a long (1) username or (2) password.

Why this priority

EPSS top 5%: 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	7.5% (top 5%)
CISA exploited list	No
Published	2004-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: digital mappings systems

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

Am I affected?

Timeline

2004-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:07 UTCUpdated Record last modified

digital mappings systems pop3 server DOWNGRADE

Affected: 1.5.3_build37

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.5.3_build37

1. Check installed version

apt-cache policy pop3-server || rpm -q pop3-server || pop3-server --version

2. No fixed release: DOWNGRADE to a release before 1.5.3_build37 (Debian / Ubuntu)

apt-cache madison pop3-server sudo apt install pop3-server=<VERSION_BEFORE_1.5.3_build37> sudo apt-mark hold pop3-server

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

dnf --showduplicates list pop3-server sudo dnf downgrade pop3-server-<VERSION_BEFORE_1.5.3_build37> sudo dnf versionlock add pop3-server

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: DMS POP3 Server 1.5.3 build 37 - Remote Buffer Overflow

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-2004-1533?

pop3 server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-1533 being exploited?

CVE-2004-1533 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-2004-1533 affect?

CVE-2004-1533 affects pop3 server. Severity is medium (CVSS 5.0). Buffer overflow in pop3svr.exe for DMS POP3 1.5.3.27 and earlier allows remote attackers to cause a denial of service (service crash) via a long (1) username or (2) password.

How urgent is CVE-2004-1533?

Priority 46/100. EPSS top 5%: very likely to be exploited; Public exploit reference

References

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