CVE-2009-4071

CVE-2009-4071 is a medium-severity vulnerability in Opera Opera Browser with a CVSS 2.0 base score of 5.8. 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-16.

Key facts

• Severity: Medium (CVSS 2.0 base score 5.8)
• EPSS exploit prediction: 2% (81st percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-16
• Affected product: Opera Opera Browser
• Published: 2009-11-24
• Last modified: 2026-06-16

Description

Opera before 10.10, when exception stacktraces are enabled, places scripting error messages from a web site into variables that can be read by a different web site, which allows remote attackers to obtain sensitive information or conduct cross-site scripting (XSS) attacks via unspecified vectors.

Frequently asked questions

What is CVE-2009-4071?

Opera before 10.10, when exception stacktraces are enabled, places scripting error messages from a web site into variables that can be read by a different web site, which allows remote attackers to obtain sensitive information or conduct cross-site scripting (XSS) attacks via unspecified vectors.

How severe is CVE-2009-4071?

CVE-2009-4071 has a CVSS 2.0 base score of 5.8, rated medium severity.

Is CVE-2009-4071 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-4071?

CVE-2009-4071 primarily affects Opera Opera Browser. In total, 29 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-4071?

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

When was CVE-2009-4071 published?

CVE-2009-4071 was published on 2009-11-24 and last updated on 2026-06-16.

References

• http://osvdb.org/60527
• http://secunia.com/advisories/37469
• http://www.opera.com/docs/changelogs/mac/1010/
• http://www.opera.com/docs/changelogs/unix/1010/
• http://www.opera.com/docs/changelogs/windows/1010/
• http://www.opera.com/support/kb/view/941/
• http://www.securityfocus.com/bid/37089
• http://www.vupen.com/english/advisories/2009/3297
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6385

Affected products (29)

• cpe:2.3:a:opera:opera_browser:*:beta_1:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:7.0:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:7.23:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:7.53:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:7.54:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:7.60:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:8.0:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:8.01:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:8.02:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:8.50:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:8.51:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:8.52:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:8.53:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:8.54:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:9.0:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:9.01:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:9.02:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:9.10:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:9.12:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:9.20:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:9.21:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:9.22:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:9.51:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:9.52:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:9.64:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:10:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:10.00:*:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:10.00:beta_3:*:*:*:*:*:*
• cpe:2.3:a:opera:opera_browser:10.01:*:*:*:*:*:*:*

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