How severe is CVE-2003-0870?

CVE-2003-0870 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2003-0870 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 15% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2003-0870?

CVE-2003-0870 primarily affects Opera Opera Browser. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2003-0870?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2003-0870 published?

CVE-2003-0870 was published on 2003-11-17 and last updated on 2026-06-16.

CVE-2003-0870

CVE-2003-0870 is a high-severity vulnerability in Opera Opera Browser with a CVSS 2.0 base score of 7.5. Its EPSS exploit-prediction score of 15% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-787.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 15% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Opera Opera Browser
Published: 2003-11-17
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2003-0870?: 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.
How severe is CVE-2003-0870?: CVE-2003-0870 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2003-0870 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 15% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2003-0870?: CVE-2003-0870 primarily affects Opera Opera Browser. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2003-0870?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2003-0870 published?: CVE-2003-0870 was published on 2003-11-17 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:opera:opera_browser:7.11:*:*:*:*:*:*:*
cpe:2.3:a:opera:opera_browser:7.20:*:*:*:*:*:*:*

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