Is CVE-2020-11909 in the CISA KEV catalog?

No. CVE-2020-11909 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-11909?

CVE-2020-11909 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2020-11909?

CVE-2020-11909 has an EPSS score of 3.59% (88th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-11909?

Upgrade tcp\/ip to 6.0.1.66 or later.

CVE & CISA-KEV Catalog

CVE-2020-11909

MEDIUMEPSS 88th pctl

5.3

CVSS v3

NVD

Description

The Treck TCP/IP stack before 6.0.1.66 has an IPv4 Integer Underflow.

CWE-191

How to fix

Remediation Available

tcp\/ipNVD

Affected:< 6.0.1.66Fixed in:6.0.1.66CVE-2020-11909derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploit Intelligence

3.59%probability of exploitation in 30 days

88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

References

Exploit1

jsof-tech.com

Vendor Advisory1

treck.com

Mitigation1

kb.cert.org

Third-Party Advisory2

Other references4

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-09-30.