How severe is CVE-2009-2975?

CVE-2009-2975 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2009-2975 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-2975?

CVE-2009-2975 affects Mozilla Firefox. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2009-2975?

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

When was CVE-2009-2975 published?

CVE-2009-2975 was published on 2009-08-27 and last updated on 2026-06-16.

CVE-2009-2975

CVE-2009-2975 is a medium-severity vulnerability in Mozilla Firefox with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Mozilla Firefox
Published: 2009-08-27
Last modified: 2026-06-16

Description

Mozilla Firefox 3.5.2 on Windows XP, in some situations possibly involving an incompletely configured protocol handler, does not properly implement setting the document.location property to a value specifying a protocol associated with an external application, which allows remote attackers to cause a denial of service (memory consumption) via vectors involving a series of function calls that set this property, as demonstrated by (1) the chromehtml: protocol and (2) the aim: protocol.

Frequently asked questions

What is CVE-2009-2975?: Mozilla Firefox 3.5.2 on Windows XP, in some situations possibly involving an incompletely configured protocol handler, does not properly implement setting the document.location property to a value specifying a protocol associated with an external application, which allows remote attackers to cause a denial of service (memory consumption) via vectors involving a series of function calls that set this property, as demonstrated by (1) the chromehtml: protocol and (2) the aim: protocol.
How severe is CVE-2009-2975?: CVE-2009-2975 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2009-2975 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-2975?: CVE-2009-2975 affects Mozilla Firefox. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2009-2975?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-2975 published?: CVE-2009-2975 was published on 2009-08-27 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:mozilla:firefox:3.5.2:*:*:*:*:*:*:*

More vulnerabilities in Mozilla Firefox

CVE-2026-4725 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149…
CVE-2026-4692 — Critical (CVSS 10.0): Sandbox escape in the Responsive Design Mode component. This vulnerability was fixed in Firefox 149, Firefox ESR…
CVE-2026-4689 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was…
CVE-2026-4688 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox…
CVE-2026-2778 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability was fixed in…
CVE-2026-2776 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability…

All CVEs affecting Mozilla Firefox →