Published:2011/07/05  Last Updated:2011/07/05

Opera vulnerable to denial-of-service (DoS)


Opera contains a denial-of-service vulnerability.

Products Affected

  • Opera versions prior to 11.50


Opera is a web browsing software. Opera contains an issue when attempting to resolve an invalid URL leading to a denial-of-service vulnerability.


If a user accesses a malicious URL, this may cause Opera or the system to crash.


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


JPCERT/CC Addendum

Vulnerability Analysis by JPCERT/CC

Analyzed on 2011.07.05

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


Masahiro Yamada reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

Other Information

JPCERT Reports
CERT Advisory
CPNI Advisory
CVE CVE-2011-1337
JVN iPedia JVNDB-2011-000049