CVE-2006-7176: The version of Sendmail 8.13.1-2 on Red Hat Enterprise Linux 4 Update 4 and earlier does not reject the "local

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MEDIUM 4.3WATCHLISTDOWNGRADE

CVE-2006-7176 is a medium-severity flaw (CVSS 4.3) affecting sendmail. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The version of Sendmail 8.13.1-2 on Red Hat Enterprise Linux 4 Update 4 and earlier does not reject the "localhost.localdomain" domain name for e-mail messages that come from external hosts, which might allow remote attackers to spoof messages.

Why this priority

On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	2.1% (top 19%)
CISA exploited list	No
Published	2007-03-27
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: sendmail

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

Am I affected?

Timeline

2007-03-27 23:19 UTCPublished CVE record published
2026-06-16 22:34 UTCUpdated Record last modified

sendmail sendmail DOWNGRADE

Affected: 8.13.1.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.13.1.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 8.13.1.2 (Debian / Ubuntu)

apt-cache madison sendmail sudo apt install sendmail=<VERSION_BEFORE_8.13.1.2> sudo apt-mark hold sendmail

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list sendmail sudo dnf downgrade sendmail-<VERSION_BEFORE_8.13.1.2> sudo dnf versionlock add sendmail

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2006-7176?

sendmail: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-7176 being exploited?

CVE-2006-7176 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-2006-7176 affect?

CVE-2006-7176 affects sendmail. Severity is medium (CVSS 4.3). The version of Sendmail 8.13.1-2 on Red Hat Enterprise Linux 4 Update 4 and earlier does not reject the "localhost.localdomain" domain name for e-mail messages that come from external hosts, which might allow remote attackers to spoof messa

How urgent is CVE-2006-7176?

Priority 40/100. On your watchlist

Software pages

Red Hat Enterprise Linux vulnerabilities

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References

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