fetchmail 6.3.0 and other versions before 6.3.2 allows remote attackers to cause a denial of service (crash) via crafted e-mail messages that cause a free of an invalid pointer when fetchmail bounces the message to the originator or local postmaster.
Conclusion & alert: CVE-2006-0321 is rated Moderate Risk (45.6/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 3.42%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 14.33% | 3.42% | -10.91% |
| 2 | 2025-03-17 | 11.18% | 14.33% | +3.15% |
| 3 | 2024-12-31 | — | 11.18% | — |
Full EPSS history (6 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
low | CVE-2006-0321 low priority: Debian including 1 source packages (fetchmail), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2006-0321 |
redhat
|
— | — | https://access.redhat.com/security/cve/CVE-2006-0321 |
suse
|
medium | CVE-2006-0321 severity moderate: SUSE including 3 source package names (fetchmail-6.4.21-2.1, fetchmail-6.5.2-160000.2.2, fetchmailconf-6.4.21-2.1), 3 product×package rows across 2 product lines (SUSE Linux Enterprise Server 16.0, openSUSE Tumbleweed): Fixed 3. | https://www.suse.com/security/cve/CVE-2006-0321/ |
ubuntu
|
medium | CVE-2006-0321 medium priority: Ubuntu including 1 source packages (fetchmail), 4 status rows across 4 suites (dapper, edgy, feisty, upstream): released 3, needs-triage 1. | https://ubuntu.com/security/CVE-2006-0321 |
This issue did not affect the versions of Fetchmail as distributed with Red Hat Enterprise Linux 2.1, 3, or 4.