CVE-2007-6591: KDE Konqueror 3.5.5 and 3.95.00, when a user accepts an SSL server certificate on the basis of the CN domain n

Routine

MEDIUM 4.3DOWNGRADE

CVE-2007-6591 is a medium-severity flaw (CVSS 4.3) affecting konqueror. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

KDE Konqueror 3.5.5 and 3.95.00, when a user accepts an SSL server certificate on the basis of the CN domain name in the DN field, regards the certificate as also accepted for all domain names in subjectAltName:dNSName fields, even though these fields cannot be examined in the product, which makes it easier for remote attackers to trick a user into accepting an invalid certificate for a spoofed web site.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Published	2007-12-28
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

2007-12-28 21:46 UTCPublished CVE record published
2026-06-16 22:48 UTCUpdated Record last modified

kde konqueror DOWNGRADE

Affected: 3.5.5 · 3.95.00

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-2007-6591?

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

Is CVE-2007-6591 being exploited?

CVE-2007-6591 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-2007-6591 affect?

CVE-2007-6591 affects konqueror. Severity is medium (CVSS 4.3). KDE Konqueror 3.5.5 and 3.95.00, when a user accepts an SSL server certificate on the basis of the CN domain name in the DN field, regards the certificate as also accepted for all domain names in subjectAltName:dNSName fields, even though t

How urgent is CVE-2007-6591?

Priority 29/100. No elevated risk signals yet.

Related CVEs

CVE-2009-2537 MEDIUM 4.3 MITIGATE KDE Konqueror allows remote attackers to cause a denial of service (memory consumption) via a large integer va
CVE-2008-5712 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-2008-5698 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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