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PatchSiren cyber security CVE debrief

CVE-2015-4495 Mozilla CVE debrief

CVE-2015-4495 is a Mozilla Firefox security feature bypass vulnerability that CISA lists in its Known Exploited Vulnerabilities catalog. Because it is a KEV-listed issue, defenders should treat it as a patching priority and follow the vendor’s update guidance. The provided official metadata does not include a CVSS score or deeper technical detail, so the safest response is to verify exposure and apply the applicable Firefox updates as soon as possible.

Vendor
Mozilla
Product
Firefox
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2022-05-25
Original CVE updated
2022-05-25
Advisory published
2022-05-25
Advisory updated
2022-05-25

Who should care

Security teams, endpoint administrators, vulnerability management owners, and any organization that uses Mozilla Firefox on managed desktops, laptops, or virtual endpoints.

Technical summary

The official source corpus identifies this issue as a Mozilla Firefox security feature bypass vulnerability. CISA added it to the Known Exploited Vulnerabilities catalog with dateAdded 2022-05-25 and dueDate 2022-06-15, and the required action in the provided metadata is to apply updates per vendor instructions. No CVSS score, exploit chain detail, or affected-version range is included in the supplied corpus, so the debrief is limited to the official catalog classification and remediation guidance.

Defensive priority

High. KEV listing indicates known exploitation risk and makes prompt remediation more urgent than ordinary backlog patching.

Recommended defensive actions

  • Inventory all Mozilla Firefox deployments across managed assets.
  • Apply the vendor-recommended Firefox updates or mitigations referenced by official guidance.
  • Verify patch compliance after remediation and track any stragglers or unmanaged endpoints.
  • Prioritize systems that are internet-facing, user-facing, or frequently used for web access.
  • Monitor official Mozilla and CISA advisories for any follow-up guidance or related issues.

Evidence notes

The source corpus contains only official metadata: the CISA Known Exploited Vulnerabilities entry, the CVE record link, and the NVD detail link. CISA’s metadata names the issue as a Mozilla Firefox security feature bypass vulnerability, marks it as KEV-listed, and states the required action is to apply updates per vendor instructions. The provided metadata also says known ransomware campaign use is Unknown. No additional technical specifics are supplied, so no unsupported exploitation details are included here.

Official resources

This debrief is based strictly on the official metadata supplied in the source corpus and official links. It intentionally excludes exploit details and any unsupported claims.