CVE-2014-3931 Looking Glass Multi-Router Looking Glass (MRLG): memory-safety flaw
In plain words: The program mishandles the memory it uses to keep track of data. A specially made input can scramble that memory. Usually lets an attacker crash the program or run their own code with its permissions.
Confirmed exploited by CISA on · US federal patch deadline Jul 28, 2025
What to do
- Install Looking Glass's security update for Multi-Router Looking Glass (MRLG). If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Turn on automatic firmware updates and replace gear the maker no longer supports.
- Change default passwords and switch off remote administration and features you do not use.
- Do not put storage boxes or cameras directly on the internet — use the maker's app or a VPN.
Who is affected
Could reach you. This one is aimed at devices or apps of the kind people own.
What's at risk: Taken over in bulk to join botnets, used to watch your traffic, or — for storage boxes — locked by ransomware.
The details
- Official name
- Multi-Router Looking Glass (MRLG) Buffer Overflow Vulnerability
- Product
- Looking Glass Multi-Router Looking Glass (MRLG)
- CISA description
- Multi-Router Looking Glass (MRLG) contains a buffer overflow vulnerability that could allow remote attackers to cause an arbitrary memory write and memory corruption.
- Type of flaw
- Memory-safety flaw (CWE-119)
- Confirmed exploited
- Jul 7, 2025
- US federal patch deadline
- Jul 28, 2025
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Answering about CVE-2014-3931 ·
Questions about CVE-2014-3931
Is CVE-2014-3931 being exploited?
Yes. CISA added CVE-2014-3931 to its Known Exploited Vulnerabilities catalog on Jul 7, 2025, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2014-3931?
Install Looking Glass's security update for Multi-Router Looking Glass (MRLG). If no update exists, follow the vendor's workaround or stop using the product until one ships. Turn on automatic firmware updates and replace gear the maker no longer supports.
Am I affected by CVE-2014-3931?
Only if you use Looking Glass Multi-Router Looking Glass (MRLG). This one is aimed at devices or apps of the kind people own.