CVE-2020-11899
MediumExploitedPublic exploitThe Treck TCP/IP stack before 6.0.1.66 has an IPv6 Out-of-bounds Read.
Published Jun 17, 2020 · Updated Nov 7, 2025
Key Facts
Patch immediately- CVE-2020-11899 is a medium-severity vulnerability (CVSS 5.4 v3.1) affecting Tcp\/ip (Treck), Wyse 5030 Firmware (Dell), Wyse 5050 All-In-One Firmware (Dell) and 1 more product.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 3, 2022. Public exploit code is available.
- EPSS estimates a 18% probability of exploitation in the next 30 days.
- Fixed versions are available, including Tcp\/ip 6.0.1.66.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
5.4
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
EPSS (30-day exploit likelihood)
18%
Higher than 97.2% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2020-11899 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
The Treck TCP/IP stack before 6.0.1.66 has an IPv6 Out-of-bounds Read.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Mar 3, 2022 | Mar 17, 2022 | Not reported |
| Industry KEV feed | Mar 3, 2022 | Mar 17, 2022 | Not reported |
| CIRCL KEV | Mar 3, 2022 | Mar 17, 2022 | Not reported |
| ENISA EUVD | Mar 3, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
4 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Tcp\/ipTreck | See advisory | 6.0.1.66 |
| Wyse 5030 FirmwareDell | See advisory | n/a |
| Wyse 5050 All-In-One FirmwareDell | See advisory | n/a |
| Wyse 7030 FirmwareDell | See advisory | n/a |
Patched Releases
Tcp\/ip
6.0.1.66
Timeline
Publicly disclosed
Jun 17, 2020
Added to CISA KEV
Mar 3, 2022
Added to Industry KEV feed
Mar 3, 2022
Added to CIRCL KEV
Mar 3, 2022
Added to ENISA EUVD
Mar 3, 2022
Last updated
Nov 7, 2025
Weakness Type
- CWE-125 Out-of-bounds Read
References
- advisoryhttps://jsof-tech.com/vulnerability-disclosure-policy/
- advisoryhttps://security.netapp.com/advisory/ntap-20200625-0006/
- advisory20200617 Multiple Vulnerabilities in Treck IP Stack Affecting Cisco Products: June 2020
- advisoryhttps://www.dell.com/support/article/de-de/sln321836/dell-response-to-the-ripple20-vulnerabilities
- advisoryhttps://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00295.html
FAQ
Common Questions.
The Treck TCP/IP stack before 6.0.1.66 has an IPv6 Out-of-bounds Read.
Affected: Tcp\/ip (Treck); Wyse 5030 Firmware (Dell); Wyse 5050 All-In-One Firmware (Dell), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 3, 2022.
Yes. It was added on Mar 3, 2022 with a federal remediation due date of Mar 17, 2022.
Public exploit code is available.
Fixed versions are available, including Tcp\/ip 6.0.1.66.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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