CVE-2007-3144: Visual truncation vulnerability in Mozilla 1.7.12 allows remote attackers to spoof the address bar and possibl

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MEDIUM 6.4DOWNGRADE

CVE-2007-3144 is a medium-severity flaw (CVSS 6.4) affecting mozilla. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Visual truncation vulnerability in Mozilla 1.7.12 allows remote attackers to spoof the address bar and possibly conduct phishing attacks via a long hostname, which is truncated after a certain number of characters, as demonstrated by a phishing attack using HTTP Basic Authentication.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.4 (Medium)
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Published	2007-06-11
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: mozilla

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

Am I affected?

Timeline

2007-06-11 18:30 UTCPublished CVE record published
2026-06-16 22:41 UTCUpdated Record last modified

mozilla mozilla DOWNGRADE

Affected: 1.7.12

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.7.12

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.7.12 (Debian / Ubuntu)

apt-cache madison mozilla sudo apt install mozilla=<VERSION_BEFORE_1.7.12> sudo apt-mark hold mozilla

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

dnf --showduplicates list mozilla sudo dnf downgrade mozilla-<VERSION_BEFORE_1.7.12> sudo dnf versionlock add mozilla

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-2007-3144?

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

Is CVE-2007-3144 being exploited?

CVE-2007-3144 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-2007-3144 affect?

CVE-2007-3144 affects mozilla. Severity is medium (CVSS 6.4). Visual truncation vulnerability in Mozilla 1.7.12 allows remote attackers to spoof the address bar and possibly conduct phishing attacks via a long hostname, which is truncated after a certain number of characters, as demonstrated by a phis

How urgent is CVE-2007-3144?

Priority 45/100. Public exploit reference

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References

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