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Vulnerability record · CVE-2003-0870 · published 17 November 2003

CVE-2003-0870: Opera browser out-of-bounds write vulnerability

Opera · Opera Browser

Heap-based buffer overflow in Opera 7.11 and 7.20 allows remote attackers to execute arbitrary code via an HREF with a large number of escaped characters in the server name.

7.5 CVSS 2.0 High EPSS 15% · top 3.3% CWE-787 · Out-of-bounds write
7.5CVSS 2.0 base score
15%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References, 4 tagged exploit
16 Jun 2026Last modified by NVD

Description

Heap-based buffer overflow in Opera 7.11 and 7.20 allows remote attackers to execute arbitrary code via an HREF with a large number of escaped characters in the server name.

AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://archives.neohapsis.com/archives/vulnwatch/2003-q4/0016.html Broken Link
http://www.atstake.com/research/advisories/2003/a102003-1.txt ExploitPatchVendor Advisory
http://www.securityfocus.com/bid/8853 Broken LinkExploitPatchThird Party AdvisoryVDB EntryVendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/13458 Third Party AdvisoryVDB Entry
http://archives.neohapsis.com/archives/vulnwatch/2003-q4/0016.html Broken Link
http://www.atstake.com/research/advisories/2003/a102003-1.txt ExploitPatchVendor Advisory
http://www.securityfocus.com/bid/8853 Broken LinkExploitPatchThird Party AdvisoryVDB EntryVendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/13458 Third Party AdvisoryVDB Entry

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2013-3211Opera browser vulnerabilityUnspecified vulnerability in Opera before 12.15 has unknown impact and attack vectors, related to a "moderately severe issue."EPSS 1.7%10.0CVE-2012-4145Opera browser vulnerabilityUnspecified vulnerability in Opera before 12.01 on Windows and UNIX, and before 11.66 and 12.x before 12.01 on Mac OS X, has unknown impact and attac…EPSS 2.2%10.0CVE-2012-3559Opera browser vulnerabilityUnspecified vulnerability in Opera before 12.00 on Mac OS X has unknown impact and attack vectors, related to a "moderate severity issue."EPSS 1.4%10.0CVE-2012-3561Opera browser memory buffer overflow vulnerabilityOpera before 11.64 does not properly allocate memory for URL strings, which allows remote attackers to execute arbitrary code or cause a denial of se…EPSS 5.2%10.0CVE-2011-4683Opera browser vulnerabilityUnspecified vulnerability in Opera before 11.60 has unknown impact and attack vectors, related to a "moderately severe issue."EPSS 2.0%10.0CVE-2011-4684Opera browser vulnerabilityOpera before 11.60 does not properly handle certificate revocation, which has unspecified impact and remote attack vectors related to "corner cases."EPSS 5.7%10.0CVE-2011-2610Opera browser vulnerabilityUnspecified vulnerability in Opera before 11.50 has unknown impact and attack vectors, related to a "moderately severe issue."EPSS 2.1%10.0CVE-2011-2628Opera browser improper input validation vulnerabilityOpera before 11.11 does not properly implement FRAMESET elements, which allows remote attackers to execute arbitrary code or cause a denial of servic…EPSS 13%

Source: NIST National Vulnerability Database (record CVE-2003-0870), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.