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CVE-2006-6498: Multiple unspecified vulnerabilities in the JavaScript engine for Mozilla Firefox 2.x before 2.0.0.1, 1.5.x be

47
This month
MEDIUM 6.8DOWNGRADEDOWNGRADEDOWNGRADE

CVE-2006-6498 is a medium-severity flaw (CVSS 6.8) affecting firefox, mozilla, thunderbird. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple unspecified vulnerabilities in the JavaScript engine for Mozilla Firefox 2.x before 2.0.0.1, 1.5.x before 1.5.0.9, Thunderbird before 1.5.0.9, SeaMonkey before 1.0.7, and Mozilla 1.7 and probably earlier on Solaris, allow remote attackers to cause a denial of service (memory corruption and crash) and possibly execute arbitrary code via unknown impact and attack vectors.

Why this priority

  • EPSS top 9%: very likely to be exploited

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

Risk facts

CVSS score6.8 (Medium)
EPSS exploit chance4.4% (top 9%)
CISA exploited listNo
Published2006-12-20
Last modified2026-06-16
Publisher (CNA): Red Hat, Inc. · Vendor: mozilla

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

Am I affected?

Timeline

mozilla firefox DOWNGRADE
Affected: 1.5 · 1.5.0.1 · 1.5.0.2 · 1.5.0.3 · 1.5.0.4 · 1.5.0.5 · 1.5.0.6 · 1.5.0.7
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.5
1. Check installed version
apt-cache policy firefox || rpm -q firefox || firefox --version
2. No fixed release: DOWNGRADE to a release before 1.5 (Debian / Ubuntu)
apt-cache madison firefox sudo apt install firefox=<VERSION_BEFORE_1.5> sudo apt-mark hold firefox
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list firefox sudo dnf downgrade firefox-<VERSION_BEFORE_1.5> sudo dnf versionlock add firefox
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.
mozilla mozilla DOWNGRADE
Affected: 1.7
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.7
1. Check installed version
apt-cache policy mozilla || rpm -q mozilla || mozilla --version
2. No fixed release: DOWNGRADE to a release before 1.7 (Debian / Ubuntu)
apt-cache madison mozilla sudo apt install mozilla=<VERSION_BEFORE_1.7> 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> 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.
mozilla thunderbird DOWNGRADE
Affected: 0.1 · 0.2 · 0.3 · 0.4 · 0.5 · 0.6 · 0.7 · 0.7.1
Fixed in: no fixed release known
Safe to downgrade to: a release before 0.1
1. Check installed version
apt-cache policy thunderbird || rpm -q thunderbird || thunderbird --version
2. No fixed release: DOWNGRADE to a release before 0.1 (Debian / Ubuntu)
apt-cache madison thunderbird sudo apt install thunderbird=<VERSION_BEFORE_0.1> sudo apt-mark hold thunderbird
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list thunderbird sudo dnf downgrade thunderbird-<VERSION_BEFORE_0.1> sudo dnf versionlock add thunderbird
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.
mozilla seamonkey DOWNGRADE
Affected: 1.0 · 1.0.1 · 1.0.2 · 1.0.3 · 1.0.4 · 1.0.5 · 1.0.6
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.0
1. Check installed version
apt-cache policy seamonkey || rpm -q seamonkey || seamonkey --version
2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)
apt-cache madison seamonkey sudo apt install seamonkey=<VERSION_BEFORE_1.0> sudo apt-mark hold seamonkey
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list seamonkey sudo dnf downgrade seamonkey-<VERSION_BEFORE_1.0> sudo dnf versionlock add seamonkey
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-2006-6498?

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

Is CVE-2006-6498 being exploited?

CVE-2006-6498 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-2006-6498 affect?

CVE-2006-6498 affects firefox, mozilla, thunderbird. Severity is medium (CVSS 6.8). Multiple unspecified vulnerabilities in the JavaScript engine for Mozilla Firefox 2.x before 2.0.0.1, 1.5.x before 1.5.0.9, Thunderbird before 1.5.0.9, SeaMonkey before 1.0.7, and Mozilla 1.7 and probably earlier on Solaris, allow remote at

How urgent is CVE-2006-6498?

Priority 47/100. EPSS top 9%: very likely to be exploited

Software pages

Mozilla Firefox vulnerabilities · Mozilla Thunderbird vulnerabilities

Related CVEs

References

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