CVE-2001-1009

CVE-2001-1009 is a critical-severity vulnerability in Fetchmail with a CVSS 2.0 base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-264.

Key facts

• Severity: Critical (CVSS 2.0 base score 10.0)
• EPSS exploit prediction: 7% (93rd percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-264
• Affected product: Fetchmail
• Published: 2001-08-31
• Last modified: 2026-06-16

Description

Fetchmail (aka fetchmail-ssl) before 5.8.17 allows a remote malicious (1) IMAP server or (2) POP/POP3 server to overwrite arbitrary memory and possibly gain privileges via a negative index number as part of a response to a LIST request.

Frequently asked questions

What is CVE-2001-1009?

Fetchmail (aka fetchmail-ssl) before 5.8.17 allows a remote malicious (1) IMAP server or (2) POP/POP3 server to overwrite arbitrary memory and possibly gain privileges via a negative index number as part of a response to a LIST request.

How severe is CVE-2001-1009?

CVE-2001-1009 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2001-1009 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2001-1009?

CVE-2001-1009 primarily affects Fetchmail. In total, 71 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2001-1009?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2001-1009 published?

CVE-2001-1009 was published on 2001-08-31 and last updated on 2026-06-16.

References

• http://archives.neohapsis.com/archives/bugtraq/2001-08/0118.html
• http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000419
• http://www.debian.org/security/2001/dsa-071
• http://www.iss.net/security_center/static/6965.php
• http://www.linux-mandrake.com/en/security/2001/MDKSA-2001-072.php3
• http://www.linuxsecurity.com/advisories/other_advisory-1555.html
• http://www.novell.com/linux/security/advisories/2001_026_fetchmail_txt.html
• http://www.redhat.com/support/errata/RHSA-2001-103.html
• http://www.securityfocus.com/bid/3164
• http://www.securityfocus.com/bid/3166

Affected products (71)

• cpe:2.3:a:fetchmail:fetchmail:*:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.5.1:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.5.2:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.5.3:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.5.4:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.5.5:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.5.6:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.5.7:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.5.8:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.6.0:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.6.1:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.6.2:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.6.3:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.6.4:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.6.5:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.6.6:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.6.7:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.6.8:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.6.9:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.7.0:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.7.1:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.7.2:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.7.3:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.7.4:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.7.5:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.7.6:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:4.7.7:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:5.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:5.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:5.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:5.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:5.0.4:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:5.0.5:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:5.0.6:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:5.0.7:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:5.0.8:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:5.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:5.1.4:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:5.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:fetchmail:fetchmail:5.2.1:*:*:*:*:*:*:*

More vulnerabilities in Fetchmail

• CVE-2001-0101 — Critical (CVSS 10.0): Vulnerability in fetchmail 5.5.0-2 and earlier in the AUTHENTICATE GSSAPI command.
• CVE-2006-5974 — High (CVSS 7.8): fetchmail 6.3.5 and 6.3.6 before 6.3.6-rc4, when refusing a message delivered via the mda option, allows remote…
• CVE-2006-5867 — High (CVSS 7.8): fetchmail before 6.3.6-rc4 does not properly enforce TLS and may transmit cleartext passwords over unsecured links if…
• CVE-2005-4348 — High (CVSS 7.8): fetchmail before 6.3.1 and before 6.2.5.5, when configured for multidrop mode, allows remote attackers to cause a…
• CVE-2021-36386 — High (CVSS 7.5): report_vbuild in report.c in Fetchmail before 6.4.20 sometimes omits initialization of the vsnprintf va_list argument,…
• CVE-2002-1365 — High (CVSS 7.5): Heap-based buffer overflow in Fetchmail 6.1.3 and earlier does not account for the "@" character when determining…

All CVEs affecting Fetchmail →

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