CVE-2007-3143: Visual truncation vulnerability in Konqueror 3.5.5 allows remote attackers to spoof the address bar and possib

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MEDIUM 6.4DOWNGRADE

CVE-2007-3143 is a medium-severity flaw (CVSS 6.4) affecting konqueror. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Visual truncation vulnerability in Konqueror 3.5.5 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	2.0% (top 19%)
CISA exploited list	No
Published	2007-06-11
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: kde

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

kde konqueror DOWNGRADE

Affected: 3.5.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.5.5

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.5.5 (Debian / Ubuntu)

apt-cache madison konqueror sudo apt install konqueror=<VERSION_BEFORE_3.5.5> sudo apt-mark hold konqueror

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

dnf --showduplicates list konqueror sudo dnf downgrade konqueror-<VERSION_BEFORE_3.5.5> sudo dnf versionlock add konqueror

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-2007-3143?

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

Is CVE-2007-3143 being exploited?

CVE-2007-3143 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-2007-3143 affect?

CVE-2007-3143 affects konqueror. Severity is medium (CVSS 6.4). Visual truncation vulnerability in Konqueror 3.5.5 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 phi

How urgent is CVE-2007-3143?

Priority 48/100. Public exploit reference

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CVE-2008-5698 MEDIUM 4.3 MITIGATE HTMLTokenizer::scriptHandler in Konqueror in KDE 3.5.9 and 3.5.10 allows remote attackers to cause a denial of
CVE-2008-4514 MEDIUM 5.0 DOWNGRADE The HTML parser in KDE Konqueror 3.5.9 allows remote attackers to cause a denial of service (application crash
CVE-2008-4382 MEDIUM 5.0 DOWNGRADE Konqueror in KDE 3.5.9 allows remote attackers to cause a denial of service (application crash) via Javascript

References

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