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Exploited vulnerability · CISA KEV

Is CVE-2014-3931 exploited? Yes: in CISA KEV since 7 Jul 2025

Gociux · Looking Glass Multi-Router Looking Glass (MRLG) · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2014-3931, Multi-Router Looking Glass (MRLG) Buffer Overflow Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 7 Jul 2025, 3020 days after it was published. It affects Looking Glass Multi-Router Looking Glass (MRLG). If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 7 Jul 2025
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity9.8CVSS 3.1 · critical
US federal due28 Jul 2025BOD 22-01 deadline

What it is

Multi-Router Looking Glass (MRLG) contains a buffer overflow vulnerability that could allow remote attackers to cause an arbitrary memory write and memory corruption.

VendorLooking Glass (1 exploited CVE in KEV)
ProductMulti-Router Looking Glass (MRLG)
VulnerabilityMulti-Router Looking Glass (MRLG) Buffer Overflow Vulnerability
WeaknessCWE-119
Published31 Mar 2017
Added to KEV7 Jul 2025
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for Multi-Router Looking Glass (MRLG) in your asset inventory, including appliances and cloud images. Stack check lists every exploited Looking Glass CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 31 Mar 2017.
  4. Get told next time. Email alerts when CISA adds a CVE for Looking Glass.

References

Questions

Is CVE-2014-3931 being exploited?

Yes. CISA added CVE-2014-3931 to the Known Exploited Vulnerabilities catalog on 7 Jul 2025, which means there is reliable evidence of exploitation in the wild.

Is CVE-2014-3931 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2014-3931?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Looking Glass's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Multi-Router Looking Glass (MRLG) and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in July 2025 · act-now radar.

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