CVE-2020-11899

Exp

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

Published: 2020-06-17 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-11899 is rated Active Exploitation (75.5/100): CVSS Medium severity, with high exploitation likelihood (EPSS 18.42%, 97th percentile). CISA KEV confirms active exploitation (added 2022-03-03) affecting Treck TCP/IP stack / IPv6. a weakness (CWE-125) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2020-11899

Name: Treck TCP/IP stack Out-of-Bounds Read Vulnerability · CISA KEV detail

Exploit added: 2022-03-03

Action due: 2022-03-17

Required action: Apply updates per vendor instructions.

Public exploit references (Exploit-DB) for CVE-2020-11899

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2020-11899

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 35.27% 18.42% -16.85%
2 2026-05-28 33.81% 35.27% +1.46%
3 2026-05-22 — 33.81% —

Full EPSS history (33 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-11899

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.4 3.1 MEDIUM
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 2.8 2.5 [email protected]
5.4 3.1 MEDIUM
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 2.8 2.5 134c704f-9b21-4f2e-91b3-4a467353bcc0
4.8 2.0 MEDIUM
AV:A/AC:L/Au:N/C:N/I:P/A:P Click to expand
Access vector (AV:A)
Requires access to an adjacent network segment.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 6.5 4.9 [email protected]

Weakness enumeration for CVE-2020-11899

Affected software / configurations for CVE-2020-11899

Vendor Product Version Raw CPE
treck tcp\/ip < 6.0.1.66 cpe:2.3:a:treck:tcp\/ip:*:*:*:*:*:*:*:*
dell wyse_5050_all-in-one_firmware — cpe:2.3:o:dell:wyse_5050_all-in-one_firmware:-:*:*:*:*:*:*:*
dell wyse_7030_firmware — cpe:2.3:o:dell:wyse_7030_firmware:-:*:*:*:*:*:*:*
dell wyse_5030_firmware — cpe:2.3:o:dell:wyse_5030_firmware:-:*:*:*:*:*:*:*

References for CVE-2020-11899

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