What is the CVSS score of CVE-2020-11899?

CVE-2020-11899 has a CVSS 3.1 base score of 5.4 (Medium). CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L. EPSS exploitation probability: 18.6%.

Is there a public PoC exploit available for CVE-2020-11899?

Yes, a public proof-of-concept exploit is available for CVE-2020-11899. Prioritise patching immediately. EPSS: 18.6%.

Tcp Ip CVE-2020-11899

MEDIUM

Out-of-bounds Read (CWE-125)

2020-06-17 cve@mitre.org

Buffer Overflow Information Disclosure Dell Tcp Ip Wyse 5050 All In One Firmware Wyse 7030 Firmware Wyse 5030 Firmware Treck

5.4

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-125 ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, read limits MITRE ATT&CK 1 technique across 1 tactic: Collection The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 5.4 (MEDIUM). Attack characteristics: adjacent network attack vector, low complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available.
Exploit ScenarioDerived	An attacker could exploit this vulnerability to read data from memory outside the intended buffer boundaries. No authentication is required to exploit this vulnerability.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Exploited in the wild (CISA KEV) No patch listed yet 18.6% exploitation probability (EPSS)

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AnalysisAI

The Treck TCP/IP stack before 6.0.1.66 has an IPv6 Out-of-bounds Read. Rated medium severity (CVSS 5.4), this vulnerability is no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Validate array indices and buffer lengths. Use memory-safe languages. Enable AddressSanitizer during testing.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Out-of-bounds Read (CWE-125), which allows attackers to read data from memory outside the intended buffer boundaries. The Treck TCP/IP stack before 6.0.1.66 has an IPv6 Out-of-bounds Read. Affected products include: Treck Tcp\/Ip, Dell Wyse 5050 All-In-One Firmware, Dell Wyse 7030 Firmware, Dell Wyse 5030 Firmware. Version information: before 6.0.1.66.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 5.4 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

Low

Lifecycle Timeline

Added to CISA KEV

Jul 14, 2026 - 04:22 CISA

CVE Published

Jun 17, 2020 - 11:15 nvd

MEDIUM 5.4

DescriptionNVD

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

Threat Intelligence Overview

EPSS Score

18.6%

Top 3% exploitable

Exploit

POC

Public exploit code exists

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

CISA KEV

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV Yes

Public POC Yes

EPSS 18.6%

Patch available No

Active threat Yes

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Out-of-Cycle

Exploitation· derived

Active

System Exposure· derived

Controlled

Automatable· derived

Human Impact· derived

High

Priority Score

116

Low Medium High Critical

KEV: +50

EPSS: +19

CVSS: +27

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.