CVE-2014-3931 — Multi-Router Looking Glass (MRLG) Buffer Overflow Vulnerability

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.

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2025-07-07. Ransomware use: Unknown.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2017-03-31T15:00:00.000Z
• Last modified: 2025-10-21T23:55:43.153Z
• Added to CISA KEV: 2025-07-07
• BOD 22-01 due: 2025-07-28

09References

• mrlg.op-sec.us — http://mrlg.op-sec.us/
• www.s3.eurecom.fr — http://www.s3.eurecom.fr/cve/CVE-2014-3931.txt
• hackerone.com — https://hackerone.com/reports/16330