CVE-2007-0451: Apache SpamAssassin before 3.1.8 allows remote attackers to cause a denial of service via long URLs in malform

Q: How do I fix CVE-2007-0451?

spamassassin: upgrade to newer than 3.1.7. Exact commands for each OS are on this page.

Q: Is CVE-2007-0451 being exploited?

CVE-2007-0451 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2007-0451 affect?

CVE-2007-0451 affects spamassassin. Severity is medium (CVSS 4.3). 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."

Q: How urgent is CVE-2007-0451?

Priority 44/100. EPSS top 6%: very likely to be exploited; On your watchlist

This month

MEDIUM 4.3WATCHLISTUPGRADE

CVE-2007-0451 is a medium-severity flaw (CVSS 4.3) affecting spamassassin. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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."

Why this priority

EPSS top 6%: very likely to be exploited
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	6.9% (top 6%)
CISA exploited list	No
Weakness	CWE-399
Published	2007-02-16
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: apache

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2007-02-16 19:28 UTCPublished CVE record published
2026-06-16 22:35 UTCUpdated Record last modified

apache spamassassin UPGRADE

Affected: <= 3.1.7 · 3.0.1 · 3.0.2 · 3.0.3 · 3.0.4 · 3.1.0 · 3.1.1 · 3.1.2

Fixed in: newer than 3.1.7

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy spamassassin || rpm -q spamassassin || spamassassin --version

2. UPGRADE to newer than 3.1.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade spamassassin

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade spamassassin

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2007-0451?

spamassassin: upgrade to newer than 3.1.7. Exact commands for each OS are on this page.

Is CVE-2007-0451 being exploited?

CVE-2007-0451 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2007-0451 affect?

CVE-2007-0451 affects spamassassin. Severity is medium (CVSS 4.3). 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."

How urgent is CVE-2007-0451?

Priority 44/100. EPSS top 6%: very likely to be exploited; On your watchlist

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References

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