Which products and versions are affected by CVE-2004-1558?

Affected: Ypops versions 0.4, 0.4.1, 0.4.2, 0.4.3, 0.4.4, 0.4.5, 0.4.6, 0.5. The full list is in the CVE brief.

Is CVE-2004-1558 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2004-1558 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2004-1558?

Public exploit code is available.

Is there a fix for CVE-2004-1558?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2004-1558 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-2004-1558

HighPublic exploit

Multiple stack-based buffer overflows in YPOPs!

Published Dec 31, 2004 · Updated Apr 15, 2026

Key Facts

Patch immediately

CVE-2004-1558 is a high-severity vulnerability (CVSS 7.5 v2) affecting Ypops.
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 71% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v2

7.5

AV:N/AC:L/Au:N/C:P/I:P/A:P

EPSS (30-day exploit likelihood)

71%

Higher than 99.4% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2004-1558 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Multiple stack-based buffer overflows in YPOPs! (aka YahooPOPS) 0.4 through 0.6 allow remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a long (1) POP3 USER command or (2) SMTP request.

Affected Products

9 affected entries in total

Product	Affected versions	Fixed in
YpopsYpops	0.4, 0.4.1, 0.4.2, 0.4.3, 0.4.4, 0.4.5, 0.4.6, 0.5	n/a

Timeline

Publicly disclosed
Dec 31, 2004
Last updated
Apr 15, 2026

References

10 more references in the full CVE brief

FAQ

Common Questions.

Multiple stack-based buffer overflows in YPOPs!
Affected: Ypops versions 0.4, 0.4.1, 0.4.2, 0.4.3, 0.4.4, 0.4.5, 0.4.6, 0.5. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

Is CVE-2004-1558 Running On Your Attack Surface?

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