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Fencer Vulns
high 7.5

CVE-2005-0337 json

Postfix 2.1.3, when /proc/net/if_inet6 is not available and permit_mx_backup is enabled in smtpd_recipient_restrictions, allows remote atta…

published 2005-02-10 21 y ago modified 2026-06-16 4 mo ago also EUVD-2005-0338

cvss
7.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.8%
EPSS 2.8% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

Postfix 2.1.3, when /proc/net/if_inet6 is not available and permit_mx_backup is enabled in smtpd_recipient_restrictions, allows remote attackers to bypass e-mail restrictions and perform mail relaying by sending mail to an IPv6 hostname.

Patch / fix

  • postfix Debian 14, Debian 13, Debian 12 2.1.4-5

debian advisories DEBIAN-CVE-2005-0337

  • postfix RHEL 4 2:2.1.5-4.2.RHEL4
  • postfix-pflogsumm RHEL 4 2:2.1.5-4.2.RHEL4

red hat advisories RHSA-2005:152

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-2005-0337 updated

security flaw

  • Red Hat Enterprise Linux AS version 4 postfix 2.1.5-4.2.RHEL4, postfix-pflogsumm 2.1.5-4.2.RHEL4 Red Hat Enterprise Linux Desktop version 4 postfix 2.1.5-4.2.RHEL4, postfix-pflogsumm 2.1.5-4.2.RHEL4 Red Hat Enterprise Linux ES version 4 postfix 2.1.5-4.2.RHEL4, postfix-pflogsumm 2.1.5-4.2.RHEL4 Red Hat Enterprise Linux WS version 4 postfix 2.1.5-4.2.RHEL4, postfix-pflogsumm 2.1.5-4.2.RHEL4
    fixed: vendor fix RHSA-2005:152

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

2.81% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

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.