How severe is CVE-2006-2420?

CVE-2006-2420 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2006-2420 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2006-2420?

CVE-2006-2420 primarily affects Mozilla Bugzilla. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2006-2420?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2006-2420 published?

CVE-2006-2420 was published on 2006-05-16 and last updated on 2026-06-16.

CVE-2006-2420

CVE-2006-2420 is a medium-severity vulnerability in Mozilla Bugzilla with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Mozilla Bugzilla
Published: 2006-05-16
Last modified: 2026-06-16

Description

Bugzilla 2.20rc1 through 2.20 and 2.21.1, when using RSS 1.0, allows remote attackers to conduct cross-site scripting (XSS) attacks via a title element with HTML encoded sequences such as ">", which are automatically decoded by some RSS readers. NOTE: this issue is not in Bugzilla itself, but rather due to design or documentation inconsistencies within RSS, or implementation vulnerabilities in RSS readers. While this issue normally would not be included in CVE, it is being identified since the Bugzilla developers have addressed it.

Frequently asked questions

What is CVE-2006-2420?: Bugzilla 2.20rc1 through 2.20 and 2.21.1, when using RSS 1.0, allows remote attackers to conduct cross-site scripting (XSS) attacks via a title element with HTML encoded sequences such as ">", which are automatically decoded by some RSS readers. NOTE: this issue is not in Bugzilla itself, but rather due to design or documentation inconsistencies within RSS, or implementation vulnerabilities in RSS readers. While this issue normally would not be included in CVE, it is being identified since the Bugzilla developers have addressed it.
How severe is CVE-2006-2420?: CVE-2006-2420 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2006-2420 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2006-2420?: CVE-2006-2420 primarily affects Mozilla Bugzilla. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2006-2420?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2006-2420 published?: CVE-2006-2420 was published on 2006-05-16 and last updated on 2026-06-16.

References

Affected products (5)

cpe:2.3:a:mozilla:bugzilla:2.20:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:bugzilla:2.20:rc1:*:*:*:*:*:*
cpe:2.3:a:mozilla:bugzilla:2.20:rc2:*:*:*:*:*:*
cpe:2.3:a:mozilla:bugzilla:2.21:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:bugzilla:2.21.1:*:*:*:*:*:*:*

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