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Fencer Vulns
high 7.8

CVE-2006-5867 json

fetchmail before 6.3.6-rc4 does not properly enforce TLS and may transmit cleartext passwords over unsecured links if certain circumstances…

published 2006-12-31 19 y ago modified 2026-06-16 4 mo ago also EUVD-2006-5851

cvss
7.8
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.5%
EPSS 4.5% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

fetchmail before 6.3.6-rc4 does not properly enforce TLS and may transmit cleartext passwords over unsecured links if certain circumstances occur, which allows remote attackers to obtain sensitive information via man-in-the-middle (MITM) attacks.

Patch / fix

  • fetchmail Debian 14, Debian 13, Debian 12 6.3.6-1

debian advisories DEBIAN-CVE-2006-5867

  • fetchmail RHEL 2.1 5.9.0-21.7.3.el2.1.4
  • fetchmail RHEL 3 6.2.0-3.el3.3
  • fetchmail RHEL 4 6.2.5-6.el4.5
  • fetchmailconf RHEL 2.1 5.9.0-21.7.3.el2.1.4

red hat advisories RHSA-2007:0018

  • fetchmail openSUSE Tumbleweed 6.4.21-2.1

opensuse advisories openSUSE-SU-2024:10753-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2006-5867 updated

fetchmail not enforcing TLS for POP3 properly

  • Red Hat Desktop version 3 fetchmail 6.2.0-3.el3.3 Red Hat Enterprise Linux AS (Advanced Server) version 2.1 fetchmail 5.9.0-21.7.3.el2.1.4, fetchmailconf 5.9.0-21.7.3.el2.1.4 Red Hat Enterprise Linux AS version 3 fetchmail 6.2.0-3.el3.3 Red Hat Enterprise Linux AS version 4 fetchmail 6.2.5-6.el4.5 Red Hat Enterprise Linux Desktop version 4 fetchmail 6.2.5-6.el4.5 Red Hat Enterprise Linux ES version 2.1 fetchmail 5.9.0-21.7.3.el2.1.4, fetchmailconf 5.9.0-21.7.3.el2.1.4
    +6 more products
    Red Hat Enterprise Linux ES version 3 fetchmail 6.2.0-3.el3.3 Red Hat Enterprise Linux ES version 4 fetchmail 6.2.5-6.el4.5 Red Hat Enterprise Linux WS version 2.1 fetchmail 5.9.0-21.7.3.el2.1.4, fetchmailconf 5.9.0-21.7.3.el2.1.4 Red Hat Enterprise Linux WS version 3 fetchmail 6.2.0-3.el3.3 Red Hat Enterprise Linux WS version 4 fetchmail 6.2.5-6.el4.5 Red Hat Linux Advanced Workstation 2.1 fetchmail 5.9.0-21.7.3.el2.1.4, fetchmailconf 5.9.0-21.7.3.el2.1.4
    fixed: vendor fix RHSA-2007:0018

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.50% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:C/I:N/A:N

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.