Is CVE-2015-0831 in the CISA KEV catalog?

No. CVE-2015-0831 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-0831?

CVE-2015-0831 has a CVSS v2 base score of 6.8 (MEDIUM).

What is the EPSS score for CVE-2015-0831?

CVE-2015-0831 has an EPSS score of 4.16% (90th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-0831?

Upgrade firefox on ubuntu 14.04 to 36.0+build2-0ubuntu0.14.04.4 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2015-0831

MEDIUMEPSS 90th pctl

6.8

CVSS v2

NVD

Description

Use-after-free vulnerability in the mozilla::dom::IndexedDB::IDBObjectStore::CreateIndex function in Mozilla Firefox before 36.0, Firefox ESR 31.x before 31.5, and Thunderbird before 31.5 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via crafted content that is improperly handled during IndexedDB index creation.

How to fix

Remediation Available

firefoxUbuntu

Fixed in:36.0+build2-0ubuntu0.14.04.4USN-2505-1

thunderbirdUbuntu

Fixed in:1:31.5.0+build1-0ubuntu0.14.04.1USN-2506-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

4.16%probability of exploitation in 30 days

90thpercentile

Elevated risk: more likely to be exploited than 90% of all known CVEs.

References

Vendor Advisory1

mozilla.org

Third-Party Advisory18

Issue Tracking1

bugzilla.mozilla.org

Other references2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.