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.

Published: 2006-05-16 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2006-2420 is rated Moderate Risk (43.1/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.54%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2006-2420

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.66% 1.54% +0.88%
2 2025-03-30 0.57% 0.66% +0.09%
3 2025-03-29 — 0.57% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2006-2420

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2006-2420

OS Trackers for CVE-2006-2420

vendor priority summary link
ubuntu medium CVE-2006-2420 medium priority: Ubuntu including 1 source packages (bugzilla), 9 status rows across 9 suites (dapper, edgy, feisty, gutsy, hardy, intrepid, jaunty, karmic, upstream): not-affected 7, ignored 1, released 1. https://ubuntu.com/security/CVE-2006-2420

NVD evaluator notes for CVE-2006-2420

Solution: Update to version 2.18.5 or 2.20.1.

Affected software / configurations for CVE-2006-2420

Vendor Product Version Raw CPE
mozilla bugzilla 2.20 cpe:2.3:a:mozilla:bugzilla:2.20:*:*:*:*:*:*:*
mozilla bugzilla 2.20 cpe:2.3:a:mozilla:bugzilla:2.20:rc1:*:*:*:*:*:*
mozilla bugzilla 2.20 cpe:2.3:a:mozilla:bugzilla:2.20:rc2:*:*:*:*:*:*
mozilla bugzilla 2.21 cpe:2.3:a:mozilla:bugzilla:2.21:*:*:*:*:*:*:*
mozilla bugzilla 2.21.1 cpe:2.3:a:mozilla:bugzilla:2.21.1:*:*:*:*:*:*:*

References for CVE-2006-2420

cvelogic Threat Intelligence