CVE-2015-4495
Published: May 25, 2022
Official Description
Moxilla Firefox allows remote attackers to bypass the Same Origin Policy to read arbitrary files or gain privileges.
CISA KEV Advisory
Mozilla Firefox Security Feature Bypass Vulnerability
Moxilla Firefox allows remote attackers to bypass the Same Origin Policy to read arbitrary files or gain privileges.
Apply updates per vendor instructions.
Risk Analysis
This Mozilla Firefox vulnerability allows remote attackers to bypass the Same Origin Policy, potentially leading to arbitrary file reading or privilege escalation. The high EPSS score of 0.71568 indicates a significant likelihood of exploitation, and its inclusion in the KEV catalog confirms it has been actively exploited.
This vulnerability has been actively exploited in the wild, as confirmed by its presence in the KEV catalog. Remote attackers are leveraging this flaw to bypass browser security mechanisms.
Ensure Mozilla Firefox is updated to the latest available version to patch this vulnerability. Users should always keep their web browsers updated to protect against known exploits.
Technical Analysis
CVE-2015-4495 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2015-4495 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2015-4495 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1