CVE-2003-0740

CVE-2003-0740 is a medium-severity vulnerability in Stunnel with a CVSS 2.0 base score of 4.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Description

Stunnel 4.00, and 3.24 and earlier, leaks a privileged file descriptor returned by listen(), which allows local users to hijack the Stunnel server.

Frequently asked questions

What is CVE-2003-0740?
Stunnel 4.00, and 3.24 and earlier, leaks a privileged file descriptor returned by listen(), which allows local users to hijack the Stunnel server.
How severe is CVE-2003-0740?
CVE-2003-0740 has a CVSS 2.0 base score of 4.6, rated medium severity.
Is CVE-2003-0740 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2003-0740?
CVE-2003-0740 primarily affects Stunnel. In total, 23 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2003-0740?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2003-0740 published?
CVE-2003-0740 was published on 2003-10-20 and last updated on 2026-06-16.

References

Affected products (23)

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