How severe is CVE-2005-1133?

CVE-2005-1133 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2005-1133 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2005-1133?

CVE-2005-1133 affects Ibm Iseries As 400. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2005-1133?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2005-1133 published?

CVE-2005-1133 was published on 2005-05-02 and last updated on 2026-06-16.

CVE-2005-1133

CVE-2005-1133 is a medium-severity vulnerability in Ibm Iseries As 400 with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Ibm Iseries As 400
Published: 2005-05-02
Last modified: 2026-06-16

Description

The POP3 server in IBM iSeries AS/400 returns different error messages when the user exists or not, which allows remote attackers to determine valid user IDs on the server.

Frequently asked questions

What is CVE-2005-1133?: The POP3 server in IBM iSeries AS/400 returns different error messages when the user exists or not, which allows remote attackers to determine valid user IDs on the server.
How severe is CVE-2005-1133?: CVE-2005-1133 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2005-1133 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2005-1133?: CVE-2005-1133 affects Ibm Iseries As 400. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2005-1133?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2005-1133 published?: CVE-2005-1133 was published on 2005-05-02 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:h:ibm:iseries_as_400:*:*:*:*:*:*:*:*

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CVE-2005-1238 — High (CVSS 7.5): By design, the built-in FTP server for iSeries AS/400 systems does not support a restricted document root, which allows…
CVE-2005-1025 — Medium (CVSS 5.0): The FTP server in AS/400 4.3, when running in IFS mode, allows remote attackers to obtain sensitive information via a…

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