CVE-2020-11899

CVE-2020-11899 is a medium-severity vulnerability in Treck Tcp/ip with a CVSS 3.x base score of 5.4. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-03-03). The underlying weakness is classified as CWE-125.

Key facts

• Severity: Medium (CVSS 3.x base score 5.4)
• CVSS v2: 4.8
• EPSS exploit prediction: 19% (97th percentile)
• Actively exploited: Yes — listed in CISA KEV (added 2022-03-03)
• EU (EUVD) id: EUVD-2020-4236
• EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2022-03-03)
• Weakness: CWE-125
• Affected product: Treck Tcp/ip
• Published: 2020-06-17
• Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2020-11899?

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

How severe is CVE-2020-11899?

CVE-2020-11899 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.

Is CVE-2020-11899 being actively exploited?

Yes. CVE-2020-11899 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-03-03, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2020-11899?

CVE-2020-11899 primarily affects Treck Tcp/ip. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-11899?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2020-11899 have an EU (EUVD) identifier?

Yes. CVE-2020-11899 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2020-4236. It is also flagged as exploited in the EUVD (since 2022-03-03).

When was CVE-2020-11899 published?

CVE-2020-11899 was published on 2020-06-17 and last updated on 2026-06-17.

References

• http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2020-006.txt
• https://cwe.mitre.org/data/definitions/125.html
• https://jsof-tech.com/vulnerability-disclosure-policy/
• https://security.netapp.com/advisory/ntap-20200625-0006/
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-treck-ip-stack-JyBQ5GyC
• https://www.dell.com/support/article/de-de/sln321836/dell-response-to-the-ripple20-vulnerabilities
• https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00295.html
• https://www.jsof-tech.com/ripple20/
• https://www.kb.cert.org/vuls/id/257161
• https://www.kb.cert.org/vuls/id/257161/
• https://www.treck.com
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-11899

Affected products (4)

• cpe:2.3:a:treck:tcp\/ip:*:*:*:*:*:*:*:*
• cpe:2.3:o:dell:wyse_5050_all-in-one_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:dell:wyse_7030_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:dell:wyse_5030_firmware:-:*:*:*:*:*:*:*

More vulnerabilities in Treck Tcp/ip

• CVE-2020-25066 — Critical (CVSS 10.0): A heap-based buffer overflow in the Treck HTTP Server component before 6.0.1.68 allows remote attackers to cause a…
• CVE-2020-11897 — Critical (CVSS 10.0): The Treck TCP/IP stack before 5.0.1.35 has an Out-of-Bounds Write via multiple malformed IPv6 packets.
• CVE-2020-11896 — Critical (CVSS 10.0): The Treck TCP/IP stack before 6.0.1.66 allows Remote Code Execution, related to IPv4 tunneling.
• CVE-2020-11898 — Critical (CVSS 9.1): The Treck TCP/IP stack before 6.0.1.66 improperly handles an IPv4/ICMPv4 Length Parameter Inconsistency, which might…
• CVE-2020-11901 — Critical (CVSS 9.0): The Treck TCP/IP stack before 6.0.1.66 allows Remote Code execution via a single invalid DNS response.
• CVE-2020-11900 — High (CVSS 8.2): The Treck TCP/IP stack before 6.0.1.41 has an IPv4 tunneling Double Free.

All CVEs affecting Treck Tcp/ip →

Other CWE-125 (Out-of-bounds Read) vulnerabilities

• CVE-2026-24826 — Critical (CVSS 10.0): Out-of-bounds Write, Divide By Zero, NULL Pointer Dereference, Use of Uninitialized Resource, Out-of-bounds Read,…
• CVE-2024-22004 — Critical (CVSS 10.0): Due to length check, an attacker with privilege access on a Linux Nonsecure operating system can trigger a…
• CVE-2021-41556 — Critical (CVSS 10.0): sqclass.cpp in Squirrel through 2.2.5 and 3.x through 3.1 allows an out-of-bounds read (in the core interpreter) that…
• CVE-2021-21777 — Critical (CVSS 10.0): An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer…
• CVE-2017-14451 — Critical (CVSS 10.0): An exploitable out-of-bounds read vulnerability exists in libevm (Ethereum Virtual Machine) of CPP-Ethereum. A…
• CVE-2013-0767 — Critical (CVSS 10.0): The nsSVGPathElement::GetPathLengthScale function in Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and…

Browse all CWE-125 (Out-of-bounds Read) vulnerabilities →