CVE-2005-0337: n/a vulnerability

CVE-2005-0337: Postfix 2.1.3, when /proc/net/if_inet6 is not available and permit_mx_backup is enabled in smtpd_recipient_...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 7, 2024, 21:13 UTC (UTC+00:00)

Security readout for executives and security teams

A specific Postfix mail-server configuration could let outsiders relay mail through the server. The issue requires Postfix 2.1.3, missing /proc/net/if_inet6, and permit_mx_backup enabled. Business impact is mainly abuse of mail infrastructure, reputation damage, and spam handling costs. Exposure appears limited to legacy Postfix 2.1.3 installations with permit_mx_backup enabled and the stated IPv6 interface visibility condition. Modern maintained distributions are less likely exposed, but inherited mail gateways and backup MX hosts should be checked. Treat as a targeted legacy mail-infrastructure risk. Prioritize if the organization operates old Postfix backup MX servers or inherited Linux mail gateways; otherwise validate during routine vulnerability management. Mitigation focus: Check OS vendor advisories for fixed Postfix packages.; Upgrade affected Postfix packages through supported distribution channels.; Disable permit_mx_backup if it is not operationally required..

Prepared: Jun 30, 2026, 00:54 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Feb 10, 2005, 05:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors

0Timeline events

0ADP providers

3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
postfix-ipv6-security-bypass(19218)CVE reference · vdb-entry, x_refsource_XF
oval:org.mitre.oval:def:11339CVE reference · vdb-entry, signature

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

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