CVE-2020-11899

Q: How do I fix CVE-2020-11899?

Upgrade tcp\/ip to 6.0.1.66 or later.

Q: Is CVE-2020-11899 being actively exploited?

Yes. CVE-2020-11899 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2022-03-17. Treat it as a priority whatever its CVSS score says.

Q: How severe is CVE-2020-11899?

CVE-2020-11899 has a CVSS v3 base score of 5.4, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2020-11899 affect?

Published advisories record a fix for tcp\/ip (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

MEDIUMCISA KEVEPSS 97th pctl

5.4

CVSS v3

NVD

Description

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

CWE-125Out-of-bounds Read

How to fix

Remediation Available

tcp\/ipNVD

Affected:< 6.0.1.66Fixed in:6.0.1.66CVE-2020-11899derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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 VectorAdjacent

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityLow

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

Exploit Intelligence

18.56%probability of exploitation in 30 days

97thpercentile

Very high risk: more likely to be exploited than 97% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Treck TCP/IP stack Out-of-Bounds Read Vulnerability

The Treck TCP/IP stack contains an IPv6 out-of-bounds read vulnerability.

Apply updates per vendor instructions.

Remediation due: 2022-03-17

References

Exploit1

jsof-tech.com

Vendor Advisory1

treck.com

Mitigation1

kb.cert.org

Third-Party Advisory7

Government Resource1

cisa.gov

Technical Description1

cwe.mitre.org

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2020-8794	Critical	9.8	89%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2023-21769	High	7.5	89%	-	Fix

Common questions

How do I fix CVE-2020-11899?

Upgrade tcp\/ip to 6.0.1.66 or later.

Is CVE-2020-11899 being actively exploited?

Yes. CVE-2020-11899 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2022-03-17. Treat it as a priority whatever its CVSS score says.

How severe is CVE-2020-11899?

CVE-2020-11899 has a CVSS v3 base score of 5.4, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2020-11899 affect?

Published advisories record a fix for tcp\/ip (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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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 2025-11-07.