# CVE-2020-11899: Treck TCP/IP stack Out-of-Bounds Read Vulnerability

Source: https://junglewise.ai/threats/cve-2020-11899-treck-tcp-ip-stack-out-of-bounds-read-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-03-03. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2020-11899 · Severity: critical · CVSS 5.4 · Exploited in the wild · Published 2022-03-03

The Treck TCP/IP stack contains an IPv6 out-of-bounds read vulnerability. This flaw allows an attacker to potentially cause a denial-of-service or read sensitive information via network-adjacent access.

## Quick answers

**Is CVE-2020-11899 exploited in the wild?** Yes. CVE-2020-11899 is known to be exploited in the wild, first recorded on 3 March 2022. Treat it as urgent.

**How severe is CVE-2020-11899?** Critical severity, with a CVSS score of 5.4, published 3 March 2022.

**Which products and versions are affected?** Treck TCP/IP stack before 6.0.1.66.

**Is there a fix for CVE-2020-11899?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2020-11899 attacked?** It is attacked from the adjacent network, in a software library.

**Am I affected by CVE-2020-11899?** Check whether you run Treck Tcp/Ip Stack IPv6. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Treck TCP/IP stack before 6.0.1.66

## Timeline

- 2020-06-16: disclosed: Initial disclosure of Ripple20 vulnerabilities.
- 2022-03-03: kev added: Added to CISA's Known Exploited Vulnerabilities Catalog.
- 2022-03-03: advisory: NVD publication date.
- 2022-03-03: exploited: Confirmed as exploited in the wild by CISA.