CVE-2006-5551

Exp

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.

Published: 2006-10-26 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2006-5551 is rated High Exploit Risk (77/100): CVSS High severity, with high exploitation likelihood (EPSS 5.06%, 91th percentile). 5 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2006-5551

EDB-ID Source Kind Published Link
3067 exploit_db edb 2007-01-01 Exploit-DB ↗
2649 exploit_db edb 2006-10-25 Exploit-DB ↗
2625 exploit_db edb 2006-10-23 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2006-5551

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 2026-06-19 5.02% 5.06% +0.04%
2 2026-06-15 48.60% 5.02% -43.58%
3 2026-04-26 — 48.60% —

Full EPSS history (15 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2006-5551

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2006-5551

OS Trackers for CVE-2006-5551

vendor priority summary link
alpine — CVE-2006-5551: no source package rows; 0 state rows across 0 repos (none); fixed 0, open 0. https://security.alpinelinux.org/vuln/CVE-2006-5551

Affected software / configurations for CVE-2006-5551

Vendor Product Version Raw CPE
qksoft qk_smtp <= 3.0.1 cpe:2.3:a:qksoft:qk_smtp:*:*:*:*:*:*:*:*

References for CVE-2006-5551

cvelogic Threat Intelligence