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

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

• Documented mitigation — www.kb.cert.org (NIST National Vulnerability Database)

CISA required action CISA

Apply updates per vendor instructions.

US federal deadline: Mar 17, 2022 — passed 1673 day(s) ago

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

1. Identify exposed assets running the affected vendor/product/version combinations (Dell Wyse 5030 Firmware, Dell Wyse 5050 All-in-one Firmware, Dell Wyse 7030 Firmware…).
2. Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
3. Apply the documented mitigations until a definitive fix is available.
4. EPSS ahead of 97% of scored CVEs: prioritize it in the patch queue.
5. Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-125 · Out-of-bounds Read

Other CVEs with this weakness →

CISA KEV details CISA

CISA lists a CVE once it has evidence of exploitation against real targets.

CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a reference date.

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 18.42%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

• Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.
• Hunt retroactively in logs from before Mar 3, 2022 (KEV listing): exploitation may have started earlier.

Timeline

What happened to this CVE, newest first.

• 2026
• Fix documented
  Oct 13, 2026 · NIST National Vulnerability Database
• Affected products added · treck/tcp/ip, dell/wyse 5050 all-in-one firmware, dell/wyse 7030 firmware, dell/wyse 5030 firmware
  Oct 13, 2026 · NIST National Vulnerability Database
• Source status changed · Published → Analyzed
  Oct 13, 2026 · NIST National Vulnerability Database
• Record published
  Oct 13, 2026
• CVSS changed · 5.4
  Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
• Source status changed · → Published
  Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
• SSVC assessment updated
  Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
• Added to CISA KEV (detected)
  Oct 13, 2026 · CISA Known Exploited Vulnerabilities
• Record created in this database
  Oct 13, 2026 · CISA Known Exploited Vulnerabilities
• 2022
• Added to CISA KEV catalog
  Mar 2, 2022 · CISA
• 2020
• CVE published
  Jun 17, 2020 · mitre

Source activity

Repeated readings are counted rather than listed.

• 3× References added · Oct 13, 2026 – Oct 13, 2026
• 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

17 on the record

• www.treck.com
  x_refsource_MISC, Product, Vendor Advisory, CVE Program (cve.org) e CISA ADP
• www.kb.cert.org/vuls/id/257161/
  x_refsource_MISC, Mitigation, Third Party Advisory, US Government Resource, CVE Program (cve.org) e CISA ADP
• www.cisa.gov/known-exploited-vulnerabilities-catalog
  US Government Resource, NIST National Vulnerability Database
• www.jsof-tech.com/ripple20
  GitHub Security Advisories
• security.netapp.com/advisory/ntap-20200625-0006/
  x_refsource_CONFIRM, Third Party Advisory, CVE Program (cve.org) e CISA ADP
• www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00295.html
  x_refsource_CONFIRM, Third Party Advisory, CVE Program (cve.org) e CISA ADP
• github.com/advisories/GHSA-6r3w-c7h6-wfhg
  GitHub Security Advisories
• jsof-tech.com/vulnerability-disclosure-policy/
  x_refsource_MISC, Broken Link, Third Party Advisory, CVE Program (cve.org) e CISA ADP
• www.arubanetworks.com/assets/alert/ARUBA-PSA-2020-006.txt
  x_refsource_CONFIRM, Broken Link, Third Party Advisory, CVE Program (cve.org) e CISA ADP
• jsof-tech.com/vulnerability-disclosure-policy
  GitHub Security Advisories
• www.jsof-tech.com/ripple20/
  x_refsource_MISC, Broken Link, Exploit, Third Party Advisory, CVE Program (cve.org) e CISA ADP
• security.netapp.com/advisory/ntap-20200625-0006
  GitHub Security Advisories
• nvd.nist.gov/vuln/detail/CVE-2020-11899
  GitHub Security Advisories
• www.dell.com/support/article/de-de/sln321836/dell-response-to-the-ripple20-vulnera
  x_refsource_MISC, Third Party Advisory, CVE Program (cve.org) e CISA ADP
• www.kb.cert.org/vuls/id/257161
  third-party-advisory, x_refsource_CERT-VN, Third Party Advisory, US Government Resource, CVE Program (cve.org) e CISA ADP
• cwe.mitre.org/data/definitions/125.html
  x_refsource_MISC, Technical Description, CVE Program (cve.org) e CISA ADP
• tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-treck-ip-stack
  vendor-advisory, x_refsource_CISCO, Third Party Advisory, CVE Program (cve.org) e CISA ADP

Elsewhere on this site

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

• No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
• No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
• No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2020-11899 is "Treck TCP/IP stack Out-of-Bounds Read Vulnerability", rated Medium. It affects Wyse 5030 Firmware (Dell); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 5.4 describes technical severity. EPSS 18.42% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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