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Fencer Intel
medium 5.4

CVE-2020-11899 kev in the critical feed json

The Treck TCP/IP stack before 6.0.1.66 has an IPv6 Out-of-bounds Read.

published 6y ago modified 4mo ago also EUVD-2020-4236

cvss
5.4
version 3.1, CNA
cisa kev
Exploited
added 2022-03-03
epss
18.4%
EPSS 18.4% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

The Treck TCP/IP stack before 6.0.1.66 has an IPv6 Out-of-bounds Read.

Patch / fix

cisa required action Apply updates per vendor instructions.

  • treck tcp/ip 6.0.1.66

Is CVE-2020-11899 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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 5.4

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

Timeline

  1. Published
  2. Added to CISA KEV
  3. CISA patch deadline
  4. CISA SSVC: exploitation active

Known exploited

Added
4y ago
Patch by
2022-03-17 (4y ago)
Ransomware
Not known
Required action
Apply updates per vendor instructions.
Vendor, product
Treck TCP/IP stack, IPv6
CISA name
Treck TCP/IP stack Out-of-Bounds Read Vulnerability

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
partial
Assessed
last yr.

Exploit prediction

18.42% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).

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
CISA ADP 3.1 5.4 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
NVD 3.1 5.4 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
CNA 3.1 5.4 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
NVD 2.0 4.8 AV:A/AC:L/Au:N/C:N/I:P/A:P

Classification

Weakness

References

Sources

Fencer Intel 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.