CVE-2020-11899

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

CVSS 5.4 (MEDIUM) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE

0.0/10

REALITY · THREAT PRIORITY

7.9/10

General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?

Recorded exploitation baseline: +7.00
Technical severity: CVSS 5.4: +0.81
Fresh EPSS: 18.42%: +0.09

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 4 documents and public datasets.

Hype components

Headline sample (25%)

0/100

Press, 30 days (60%)

0/100

Grounded branding (15%)

0/100

HYPE TOTAL0/100

Sources and documents

Industrial Cyber

Press · 29 Oct 2024, 07:00 · Cyble reports surge in cyberattacks targeting critical infrastructure and open-source vulnerabilities - Industrial Cyber

Smart Industry

Press · 24 Aug 2023, 07:00 · Ghosts in the network: How attackers remain unseen - Smart Industry

Palo Alto Networks

Press · 30 Oct 2020, 07:00 · How to Identify and Remediate the Risks Associated with Ripple20 - Palo Alto Networks

Qualys

Press · 24 Jun 2020, 07:00 · Ripple20: Multiple Vulnerabilities Identified in Treck TCP/IP Stack - Qualys

Score evolution

● Hype ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.0 · reality 7.9 (2026-11-02 15:12). The curve appears once the score changes.

Public exploit evidence

Public exploit entries / repo candidates

Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence: Exploitation recorded
Priority basis: Recorded exploitation; CVSS 5.4; EPSS 18.4%
Attention, last 30 days: 0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential: adjacent access, no prior privileges, no user interaction.
Observed activity: Exploitation recorded in CISA KEV.
Known scale: Not quantified.
Evidence confidence basis: Trusted exploitation confirmation

Score evaluated: 2026-11-05 13:58:12.189153+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline

Published

17 Jun 2020, 10:27

First press mention

24 Jun 2020, 07:00

Added to the CISA KEV catalog

03 Mar 2022, 00:00

Latest press mention

29 Oct 2024, 07:00

Score calculated

05 Nov 2026, 13:58