Published:2012/05/25  Last Updated:2012/05/30

Opera fails to verify SSL server certificates


Opera contains an issue where it fails to verify SSL server certificates.

Products Affected

  • Opera versions prior to 9.63


Opera is a web browser. Opera contains an issue where it fails to verify SSL server certificates.


The user may unknowingly connect to a site that is using a certificate not authorized by a CA. As a result, the user may become a victim of phishing.


Update the software
Update to the latest version according to the information provided by the developer.

Vendor Status

Vendor Link
Opera Opera Download


JPCERT/CC Addendum

This JVN publication was delayed to 2012/05/25 after the developer fix was developed. From the fiscal year 2011, JPCERT/CC is using a new vendor coordination procedure. This new procedure came from the recommendation of the fiscal year 2010 "Study Group on Information System Vulnerability Handling" aimed at more timely JVN publications.

Vulnerability Analysis by JPCERT/CC

Analyzed on 2012.05.25

Measures Conditions Severity
Access Required can be attacked over the Internet using packets
  • High
Authentication anonymous or no authentication (IP addresses do not count)
  • High
User Interaction Required the user must be convinced to take a standard action that does not feel harmful to most users, such as click on a link or view a file
  • Mid
Exploit Complexity some expertise and/or luck required (most buffer overflows, guessing correctly in small space, expertise in Windows function calls)
  • Mid-High

Description of each analysis measures


Other Information

JPCERT Reports
CERT Advisory
CPNI Advisory
CVE CVE-2012-1251
JVN iPedia JVNDB-2012-000049

Update History

Information under the section "Other Information" was added.