What is CVE-2011-2628?

CVE-2011-2628 is a vulnerability in Opera Browser, classified under Improper Input Validation. Published 2011-07-01.

Is CVE-2011-2628 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Improper input validation in Opera Browser

CVE-2011-2628

Opera before 11.11 does not properly implement FRAMESET elements, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via vectors related to page unload.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2011-07-01 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 10.0 (High). Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.134 (96.3th percentile), scored 2026-09-29.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.134 · newest: 0.134 · change: 0.000

Affected products

Opera Browser — versions 5.0, 5.02, 5.10

Weakness classification (CWE)

CWE-20 — Improper Input Validation

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

www.opera.com/docs/changelogs/unix/1111/
www.opera.com/docs/changelogs/windows/1111/
www.opera.com/support/kb/view/992/ (Vendor Advisory)
securityreason.com/securityalert/8425 (third-party-advisory)
www.opera.com/docs/changelogs/mac/1111/

Frequently asked questions

What is CVE-2011-2628?: CVE-2011-2628 is a vulnerability in Opera Browser, classified under Improper Input Validation. Published 2011-07-01.
Is CVE-2011-2628 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.