CVE-2007-0451

Apache SpamAssassin before 3.1.8 allows remote attackers to cause a denial of service via long URLs in malformed HTML, which triggers "massive memory usage."

Published: 2007-02-16 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2007-0451 is rated Moderate Risk (44.8/100): CVSS Medium severity, with high exploitation likelihood (EPSS 6.66%, 93th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2007-0451

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 33.37% 6.66% -26.71%
2 2026-03-12 29.34% 33.37% +4.02%
3 2025-11-27 — 29.34% —

Full EPSS history (21 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2007-0451

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2007-0451

OS Trackers for CVE-2007-0451

vendor priority summary link
debian not yet assigned CVE-2007-0451 not yet assigned priority: Debian including 1 source packages (spamassassin), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2007-0451
gentoo normal CVE-2007-0451: 1 GLSA(s) (200703-02), 1 atom(s) (mail-filter/spamassassin); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2007-0451
redhat high — https://access.redhat.com/security/cve/CVE-2007-0451
ubuntu medium CVE-2007-0451 medium priority: Ubuntu including 1 source packages (spamassassin), 9 status rows across 9 suites (dapper, edgy, feisty, gutsy, hardy, intrepid, jaunty, karmic, upstream): released 6, ignored 2, needs-triage 1. https://ubuntu.com/security/CVE-2007-0451

NVD evaluator notes for CVE-2007-0451

Solution: Upgrade to SpamAssassin version 3.1.8

Affected software / configurations for CVE-2007-0451

Vendor Product Version Raw CPE
apache spamassassin <= 3.1.7 cpe:2.3:a:apache:spamassassin:*:*:*:*:*:*:*:*
apache spamassassin 3.0.1 cpe:2.3:a:apache:spamassassin:3.0.1:*:*:*:*:*:*:*
apache spamassassin 3.0.2 cpe:2.3:a:apache:spamassassin:3.0.2:*:*:*:*:*:*:*
apache spamassassin 3.0.3 cpe:2.3:a:apache:spamassassin:3.0.3:*:*:*:*:*:*:*
apache spamassassin 3.0.4 cpe:2.3:a:apache:spamassassin:3.0.4:*:*:*:*:*:*:*
apache spamassassin 3.1.0 cpe:2.3:a:apache:spamassassin:3.1.0:*:*:*:*:*:*:*
apache spamassassin 3.1.1 cpe:2.3:a:apache:spamassassin:3.1.1:*:*:*:*:*:*:*
apache spamassassin 3.1.2 cpe:2.3:a:apache:spamassassin:3.1.2:*:*:*:*:*:*:*

References for CVE-2007-0451

URL Tags
http://fedoranews.org/cms/node/2657 Patch
http://fedoranews.org/cms/node/2659 Patch
http://osvdb.org/33207
http://rhn.redhat.com/errata/RHSA-2007-0074.html
http://secunia.com/advisories/24197 Vendor Advisory
http://secunia.com/advisories/24200 Vendor Advisory
http://secunia.com/advisories/24250 Vendor Advisory
http://secunia.com/advisories/24256 Vendor Advisory
http://secunia.com/advisories/24265 Vendor Advisory
http://secunia.com/advisories/24307 Vendor Advisory
http://secunia.com/advisories/24889 Vendor Advisory
http://security.gentoo.org/glsa/glsa-200703-02.xml
http://spamassassin.apache.org/advisories/cve-2007-0451.txt
http://svn.apache.org/repos/asf/spamassassin/branches/3.1/build/announcements/3.1.8.txt
http://www.mandriva.com/security/advisories?name=MDKSA-2007:049
http://www.novell.com/linux/security/advisories/2007_6_sr.html
http://www.redhat.com/support/errata/RHSA-2007-0075.html
http://www.securityfocus.com/bid/22584 Patch
http://www.securitytracker.com/id?1017666
http://www.vupen.com/english/advisories/2007/0628 Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/32536
https://issues.rpath.com/browse/RPL-1073
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10018
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