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Fencer Vulns
critical 9.0

CVE-2020-11901 in the critical feed json

The Treck TCP/IP stack before 6.0.1.66 allows Remote Code execution via a single invalid DNS response.

published 2020-06-17 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-4238

cvss
9.0
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
21.6%
EPSS 21.6% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

The Treck TCP/IP stack before 6.0.1.66 allows Remote Code execution via a single invalid DNS response.

Patch / fix

  • treck tcp/ip 6.0.1.66

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-20-168-01 updated cvss 9.0

Treck TCP/IP (Update I)

  • Treck Inc. Treck Inc TCP/IP IPv4, IPv6, UDP, DNS
    affected: mitigation “Treck recommends users apply the latest version of the affected products:” rockwellautomation.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

21.61% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • jsof-tech.com https://www.jsof-tech.com/ripple20/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 9.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD 2.0 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-125 Out-of-bounds Read
  • CWE-131 Incorrect Calculation of Buffer Size
  • CWE-330 Use of Insufficiently Random Values
  • CWE-787 Out-of-bounds Write

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.