Buffer overflow in Opera Browser

CVE-2003-1387

Buffer overflow in Opera 6.05 and 6.06, and possibly other versions, allows remote attackers to execute arbitrary code via a URL with a long username.

Vulnerability class: Buffer Overflow

Published 2003-12-31 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 7.5 (High). Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.147 (96.6th percentile), scored 2026-09-29.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 96.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.147 · newest: 0.147 · change: 0.000

Affected products

Opera Browser — versions 6.05, 6.06, 7.0

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

www.securityfocus.com/archive/1/315794 (mailing-list, Exploit, VDB Entry, Third Party Advisory, Broken Link)
www.securityfocus.com/archive/1/311194 (mailing-list, VDB Entry, Third Party Advisory, Broken Link)
www.securityfocus.com/bid/6811 (Patch, VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
securityreason.com/securityalert/3253 (Broken Link, third-party-advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/11281 (VDB Entry, Third Party Advisory, vdb-entry)