What is CVE-2019-12260?

CVE-2019-12260 is a critical-severity vulnerability in Belden Garrettcom Magnum Dx940e, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2019-08-09.

How severe is CVE-2019-12260?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2019-12260 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Belden Garrettcom Magnum Dx940e

CVE-2019-12260

Wind River VxWorks 6.9 and vx7 has a Buffer Overflow in the TCP component (issue 2 of 4). This is an IPNET security vulnerability: TCP Urgent Pointer state confusion caused by a malformed TCP AO option.

Vulnerability class: Buffer Overflow

Published 2019-08-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.233 (97.8th percentile), scored 2026-10-20.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 97.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.228 · newest: 0.233 · change: +0.004

Affected products

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

References

www.oracle.com/security-alerts/cpuoct2020.html (Third Party Advisory)
support2.windriver.com/index.php (Issue Tracking, Vendor Advisory)
psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0009 (Third Party Advisory)
cert-portal.siemens.com/productcert/pdf/ssa-632562.pdf (Third Party Advisory)
security.netapp.com/advisory/ntap-20190802-0001/ (Third Party Advisory)
www.windriver.com/security/announcements/tcp-ip-network-stack-ipnet-urgent11/ (Vendor Advisory)
support2.windriver.com/index.php (Vendor Advisory)
support.f5.com/csp/article/K41190253 (Third Party Advisory)
cert-portal.siemens.com/productcert/pdf/ssa-189842.pdf (Third Party Advisory)
cert-portal.siemens.com/productcert/pdf/ssa-352504.pdf (Third Party Advisory)

Frequently asked questions

What is CVE-2019-12260?: CVE-2019-12260 is a critical-severity vulnerability in Belden Garrettcom Magnum Dx940e, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2019-08-09.
How severe is CVE-2019-12260?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2019-12260 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.