How severe is CVE-2005-0337?

CVE-2005-0337 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2005-0337 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2005-0337?

CVE-2005-0337 primarily affects Wietse Venema Postfix. In total, 13 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2005-0337?

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

When was CVE-2005-0337 published?

CVE-2005-0337 was published on 2005-05-02 and last updated on 2026-06-16.

CVE-2005-0337

CVE-2005-0337 is a high-severity vulnerability in Wietse Venema Postfix with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Wietse Venema Postfix
Published: 2005-05-02
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2005-0337?: 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.
How severe is CVE-2005-0337?: CVE-2005-0337 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2005-0337 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2005-0337?: CVE-2005-0337 primarily affects Wietse Venema Postfix. In total, 13 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2005-0337?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2005-0337 published?: CVE-2005-0337 was published on 2005-05-02 and last updated on 2026-06-16.

References

Affected products (13)

cpe:2.3:a:wietse_venema:postfix:2.1.3:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:4.0:*:advanced_server:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:4.0:*:enterprise_server:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:4.0:*:workstation:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_desktop:4.0:*:*:*:*:*:*:*
cpe:2.3:o:suse:suse_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:suse:suse_linux:8.0:*:i386:*:*:*:*:*
cpe:2.3:o:suse:suse_linux:8.1:*:*:*:*:*:*:*
cpe:2.3:o:suse:suse_linux:8.2:*:*:*:*:*:*:*
cpe:2.3:o:suse:suse_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:suse:suse_linux:9.0:*:x86_64:*:*:*:*:*
cpe:2.3:o:suse:suse_linux:9.1:*:*:*:*:*:*:*
cpe:2.3:o:suse:suse_linux:9.2:*:*:*:*:*:*:*