CVE-2006-3216 — Clearswift MAILsweeper for SMTP before 4.3.20 and MAILsweeper for Exchange before 4.3.20 allows remote attackers to cause a denial of service via (1) non-ASCII characters in a reverse DNS lookup result from a Received header, which leads to a Receiver service stop, and (2) unspecified vectors involving malformed messages, which causes "unpredictable behavior" that prevents the Security service from processing more messages

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MEDIUM

Clearswift MAILsweeper for SMTP before 4.3.20 and MAILsweeper for Exchange before 4.3.20 allows remote attackers to cause a denial of service via (1) non-ASCII characters in a reverse DNS lookup result from a Received header, which leads to a Receiver service stop, and (2) unspecified vectors involving malformed messages, which causes "unpredictable behavior" that prevents the Security service from processing more messages

Published Jun 24, 2006

5.0

MEDIUM

CVSS 2.0

EPSS 1.86%

Description

Clearswift MAILsweeper for SMTP before 4.3.20 and MAILsweeper for Exchange before 4.3.20 allows remote attackers to cause a denial of service via (1) non-ASCII characters in a reverse DNS lookup result from a Received header, which leads to a Receiver service stop, and (2) unspecified vectors involving malformed messages, which causes "unpredictable behavior" that prevents the Security service from processing more messages.

Affected products

Remediation

No remediation recorded yet.

Metrics

1.86% 0.01856

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.

EPSS probability 0.01856

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (13 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 2, 2026	1.86% (0.01856)	78.44th	v5 (v2026.06.15)
Jun 15, 2026	1.82% (0.01822)	75.89th	v5 (v2026.06.15)
Mar 17, 2025	1.29% (0.01294)	78.30th	v4 (v2025.03.14)
Dec 12, 2024	3.43% (0.03428)	91.81th	v3 (v2023.03.01)
Aug 19, 2023	3.43% (0.03428)	90.26th	v3 (v2023.03.01)
Jun 4, 2023	3.86% (0.03858)	90.61th	v3 (v2023.03.01)
Apr 27, 2023	3.85% (0.03846)	90.54th	v3 (v2023.03.01)
Mar 20, 2023	4.51% (0.04511)	91.18th	v3 (v2023.03.01)
Mar 7, 2023	4.83% (0.04831)	91.46th	v3 (v2023.03.01)
Mar 6, 2023	1.41% (0.01408)	72.89th	v2 (v2022.01.01)
Mar 2, 2023	1.41% (0.01408)	72.88th	v2 (v2022.01.01)
Apr 1, 2022	1.41% (0.01408)	70.87th	v2 (v2022.01.01)
Feb 4, 2022	1.41% (0.01408)	49.94th	v2 (v2022.01.01)

Weaknesses (0)

No CWE recorded.

References (8)

http://download.mimesweeper.com/www/TechnicalDocumentation/ReadMe_MSW_4%2C3%2C20.htm
x_refsource_CONFIRM
http://secunia.com/advisories/20756
third-party-advisoryx_refsource_SECUNIAPatchVendor Advisory
http://www.osvdb.org/26738
vdb-entryx_refsource_OSVDB
http://www.osvdb.org/26739
vdb-entryx_refsource_OSVDB
http://www.securityfocus.com/bid/18584
vdb-entryx_refsource_BIDPatch
http://www.vupen.com/english/advisories/2006/2473
vdb-entryx_refsource_VUPEN
https://exchange.xforce.ibmcloud.com/vulnerabilities/27303
vdb-entryx_refsource_XF
https://exchange.xforce.ibmcloud.com/vulnerabilities/27305
vdb-entryx_refsource_XF

Link	Providers	Tags
http://download.mimesweeper.com/www/TechnicalDocumentation/ReadMe_MSW_4%2C3%2C20.htm		x_refsource_CONFIRM
http://secunia.com/advisories/20756		third-party-advisoryx_refsource_SECUNIAPatchVendor Advisory
http://www.osvdb.org/26738		vdb-entryx_refsource_OSVDB
http://www.osvdb.org/26739		vdb-entryx_refsource_OSVDB
http://www.securityfocus.com/bid/18584		vdb-entryx_refsource_BIDPatch
http://www.vupen.com/english/advisories/2006/2473		vdb-entryx_refsource_VUPEN
https://exchange.xforce.ibmcloud.com/vulnerabilities/27303		vdb-entryx_refsource_XF
https://exchange.xforce.ibmcloud.com/vulnerabilities/27305		vdb-entryx_refsource_XF

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner mitre

Published Jun 24, 2006

Updated Aug 7, 2024

Reserved Jun 23, 2006

Link CVE-2006-3216

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 16, 2026

Link CVE-2006-3216

Red Hat

Severity n/a

Public date n/a

Links CVE-2006-3216