CVE-2014-3931
CriticalExploitedPublic exploitfastping.c in MRLG (aka Multi-Router Looking Glass) before 5.5.0 allows remote attackers to cause an arbitrary memory write and memory corruption.
Published Mar 31, 2017 · Updated Apr 21, 2026
Key Facts
Patch immediately- CVE-2014-3931 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Multi-Router Looking Glass (Multi-Router Looking Glass Project).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jul 7, 2025. Public exploit code is available.
- EPSS estimates a 29% probability of exploitation in the next 30 days.
- Fixed versions are available, including Multi-Router Looking Glass 5.4.1.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
29%
Higher than 98.1% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2014-3931 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
fastping.c in MRLG (aka Multi-Router Looking Glass) before 5.5.0 allows remote attackers to cause an arbitrary memory write and memory corruption.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Jul 7, 2025 | Jul 28, 2025 | Not reported |
| Industry KEV feed | Jul 7, 2025 | Jul 28, 2025 | Not reported |
| CIRCL KEV | Jul 7, 2025 | Jul 28, 2025 | Not reported |
| ENISA EUVD | Jul 7, 2025 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Multi-Router Looking GlassMulti-Router Looking Glass Project | See advisory | 5.4.1 |
Patched Releases
Multi-Router Looking Glass
5.4.1
Timeline
Publicly disclosed
Mar 31, 2017
Added to CISA KEV
Jul 7, 2025
Added to Industry KEV feed
Jul 7, 2025
Added to CIRCL KEV
Jul 7, 2025
Added to ENISA EUVD
Jul 7, 2025
Last updated
Apr 21, 2026
Weakness Type
- CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
References
- advisoryhttp://mrlg.op-sec.us/
- advisoryhttp://www.s3.eurecom.fr/cve/CVE-2014-3931.txt
- exploitVulnCheck exploitation report
- exploithttps://hackerone.com/reports/16330
- exploitVulnCheck exploitation report
FAQ
Common Questions.
fastping.c in MRLG (aka Multi-Router Looking Glass) before 5.5.0 allows remote attackers to cause an arbitrary memory write and memory corruption.
Affected: Multi-Router Looking Glass (Multi-Router Looking Glass Project). The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jul 7, 2025.
Yes. It was added on Jul 7, 2025 with a federal remediation due date of Jul 28, 2025.
Public exploit code is available.
Fixed versions are available, including Multi-Router Looking Glass 5.4.1.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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