How severe is CVE-2009-2540?

CVE-2009-2540 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2009-2540 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-2540?

CVE-2009-2540 affects Opera Opera Browser. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2009-2540?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2009-2540 published?

CVE-2009-2540 was published on 2009-07-20 and last updated on 2026-06-16.

CVE-2009-2540

CVE-2009-2540 is a medium-severity vulnerability in Opera Opera Browser with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-770
Affected product: Opera Opera Browser
Published: 2009-07-20
Last modified: 2026-06-16

Description

Opera, possibly 9.64 and earlier, allows remote attackers to cause a denial of service (memory consumption) via a large integer value for the length property of a Select object, a related issue to CVE-2009-1692.

Frequently asked questions

What is CVE-2009-2540?: Opera, possibly 9.64 and earlier, allows remote attackers to cause a denial of service (memory consumption) via a large integer value for the length property of a Select object, a related issue to CVE-2009-1692.
How severe is CVE-2009-2540?: CVE-2009-2540 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2009-2540 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-2540?: CVE-2009-2540 affects Opera Opera Browser. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2009-2540?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-2540 published?: CVE-2009-2540 was published on 2009-07-20 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:opera:opera_browser:*:*:*:*:*:*:*:*

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