CVE-2006-5551

CVE-2006-5551 is a high-severity vulnerability in Qksoft Qk Smtp 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

Description

Stack-based buffer overflow in QK SMTP 3.01 and earlier might allow remote attackers to execute arbitrary code via a long argument to the RCPT TO command.

Frequently asked questions

What is CVE-2006-5551?
Stack-based buffer overflow in QK SMTP 3.01 and earlier might allow remote attackers to execute arbitrary code via a long argument to the RCPT TO command.
How severe is CVE-2006-5551?
CVE-2006-5551 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2006-5551 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2006-5551?
CVE-2006-5551 affects Qksoft Qk Smtp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2006-5551?
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-2006-5551 published?
CVE-2006-5551 was published on 2006-10-26 and last updated on 2026-06-16.

References

Affected products (1)