BlackTreeCVE Intelligence
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Full vulnerability report · 2020
CVE-2020-11905High confidence

The Treck TCP/IP stack before 6.0.1.66 has a DHCPv6 Out-of-bounds Read

Unknown · Unknown

6.5MediumCVSS 3.1
Recommended action
Within 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:Medium, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • A structured source references public exploit or proof-of-concept material.
  • EPSS is 1.99% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs Unknown Unknown and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: As exposure requiresRemediation target: Within 365 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

2 current
sevd-2020-175-01 · CSAF 2.0 · revision 2.18.0 · finalSchneider Electric CPCERTTreck TCP/IP Vulnerabilities (Ripple20)
34 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • Schneider Electric ATV340E Altivar Machine Drives prior to 3.2IE25
  • Schneider Electric ATV630/650/660/680/6A0/6B0 Altivar Process Drives prior to 3.3IE33
  • Schneider Electric ATV930/950/960/980/9A0/9B0 Altivar Process Drives prior to V3.3IE26
  • Schneider Electric ATV6000 Medium Voltage Altivar Process Drives prior to V1.6IE01
  • Schneider Electric SCADAPack 32 RTU prior to V2.25
  • Schneider Electric TM3BC bus coupler module – EIP prior to V2.2.1.1
  • Schneider Electric TM3BC bus coupler module - SL prior to V2.1.1.1
  • Schneider Electric TM3BC bus coupler module - CANOpen prior to V2.1.1.1
  • Schneider Electric VW3A3310 Altivar 61/71 Modbus TCP option version 2.1IE09 and prior
  • Schneider Electric VW3A3310D Altivar 61/71 Ethernet daisy chain option Version 3.0IE11 and prior
  • Schneider Electric VW3A3320 Altivar 61/71 Ethernet IP RSTP option version V1.1IE19 and prior
  • Schneider Electric VW3A3320 Altivar 61/71 Ethernet IP option Version V1.2IE14 and prior
Summary
Additional details on these specific vulnerabilities can be found on the ICS-CERT Advisory at https://www.us-cert.gov/ics/advisories/ICSA-20-168-01.
Remediation
A fix is now available in product releases V3.2IE25 and above. For product release prior to V3.2IE25, apply the mitigations detailed in the Recommended Mitigations section and contact your local technical support for more information.
SEVD-2020-174-01 · CSAF 2.0 · revision 2.3.0 · finalSchneider Electric CPCERTAPC by Schneider Electric Network Management Cards (NMC) and NMC Embedded Devices
33 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • Schneider Electric Uninterruptible Power Supply (UPS) using NMC2 1-Phase and 3-Phase UPS models including Smart-UPS, Symmetra, and Galaxy with Network Management Card 2 (NMC2): AP9630/AP9630CH/AP9630J NMC2 AOS V6.9.4 and earlier
  • Schneider Electric Uninterruptible Power Supply (UPS) using NMC2 1-Phase and 3-Phase UPS models including Smart-UPS, Symmetra, and Galaxy with Network Management Card 2 (NMC2): AP9631/AP9631CH/AP9631J NMC2 AOS V6.9.4 and earlier
  • Schneider Electric Uninterruptible Power Supply (UPS) using NMC2 1-Phase and 3-Phase UPS models including Smart-UPS, Symmetra, and Galaxy with Network Management Card 2 (NMC2): AP9635/AP9635CH NMC2 AOS V6.9.4 and earlier
  • Schneider Electric Uninterruptable Power Supply (UPS) using NMC1 - SUMX AP9617 (discontinued in Nov 2011) Smart-UPS NMC1 v3.9.2 and earlier
  • Schneider Electric Uninterruptable Power Supply (UPS) using NMC1 - SUMX AP9619 (discontinued in Sep 2012) Smart-UPS NMC1 v3.9.2 and earlier
  • Schneider Electric Uninterruptable Power Supply (UPS) using NMC1 - SUMX AP9618 (discontinued in Jan 2017) Smart-UPS NMC1 v3.9.2 and earlier
  • Schneider Electric Uninterruptable Power Supply (UPS) using NMC1 - SUMX Smart-UPS models embedded with NMC1 Smart-UPS NMC1 v3.9.2 and earlier
  • Schneider Electric Uninterruptible Power Supply (UPS) using NMC3 Network Management Card 3 (NMC3) SmartSlot card models: AP9640/AP9640J NMC3 AOS V1.3.0.6 and earlier
  • Schneider Electric Uninterruptible Power Supply (UPS) using NMC3 Network Management Card 3 (NMC3) SmartSlot card models: AP9641/AP9641J NMC3 AOS V1.3.0.6 and earlier
  • Schneider Electric Battery Management Embedded NMC2 - Battery Manager - AP9922 NMC2 AOS V6.9.4 and earlier
  • Schneider Electric APC 3-Phase Power Distribution Products: InfraStruXure 150kVA PDU with 84 poles (X84P) NMC2 AOS V6.9.4 and earlier
  • Schneider Electric APC 3-Phase Power Distribution Products: InfraStruXure 40 and 60 kVA PDU (XPDU) NMC2 AOS V6.9.4 and earlier
Summary
Network Management Card Family - Network Management Card 1 (NMC1), Network Management Card 2 (NMC2), Network Management Card 3 (NMC3)
Remediation
Patches for the vulnerabilities have begun being released for applications running on the NMC2 platforms. Customers are urged to upgrade to applications using NMC2 AOS V6.9.6 or later. Note: AOS V6.9.2/6.9.4 addressed 14 of the 15 CVEs. AOS V6.9.6 addresses CVE-2020-11901. Refer to this link for the latest information on application patch availability: https://www.apc.com/us/en/faqs/FA410359/
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2020-4242

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

The Treck TCP/IP stack before 6.0.1.66 has a DHCPv6 Out-of-bounds Read.

What

The Treck TCP/IP stack before 6.0.1.66 has a DHCPv6 Out-of-bounds Read.

Why

The product reads data past the end, or before the beginning, of the intended buffer.

How

An attacker operating through the affected interface may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

The Treck TCP/IP stack before 6.0.1.66 has a DHCPv6 Out-of-bounds Read.

Why

The product reads data past the end, or before the beginning, of the intended buffer.

How

An attacker operating through the affected interface may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
the affected interface → Out-of-bounds Read → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Unspecified
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-125 ↗

CWE-125: Out-of-bounds Read. The product reads data past the end, or before the beginning, of the intended buffer.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVAdjacentAttack vector: The attacker must be on an adjacent or logically close network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.INoneIntegrity impact: No direct loss is represented by this metric.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
UnauthenticatedCWE-125Public exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-2023-0683Treck TCP/IP-Stack: Mehrere Schwachstellen

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Produkten, die die Treck TCP/IP-Stack-Bibliothek verwenden, ausnutzen, um beliebigen Programmcode auszuführen oder einen Denial of Service Zustand herbeizuführen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20200624Security Bulletin 24 Jun 2020

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 24 Jun 2020, published on 24 June 2020. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2020-AVI-375[MàJ] Multiples vulnérabilités dans la pile TCP/IP de Treck

Le 16 juin 2020, des chercheurs ont annoncé la découverte de dix-neuf vulnérabilités dans l'implémentation de la pile TCP/IP de Treck. Ce composant est utilisé dans de nombreux systèmes embarqués et objets connectés, dont certains équipements médicaux et équipements de contrôle industriel. Les vulnérabilités les plus critiques permettent une exécution de code arbitraire à distance. Lorsque des vulnérabilités sont découvertes dans un composant d'aussi bas niveau, il est très difficile de compiler une liste exhaustive de produits vulnérables. De plus, la simple présence de ce composant dans un produit n'implique pas forcément que celui-ci est vulnérable, parce que la vulnérabilité a déjà été corrigée ou encore parce que ce composant a été modifié et que la vulnérabilité n'est pas forcément atteignable. Le CERT Carneggie Mellon ainsi que les chercheurs ont proposé sur leurs sites respectifs une liste de produits vulnérables et certains éditeurs ont déjà communiqué sur le statut de leurs produits (cf. section Documentation). Parmi les dix-neuf vulnérabilités, les trois les plus critiques sont identifiées comme : CVE-2020-11896 : des datagrammes UDP fragmentés sur plusieurs paquets IP peuvent permettre un exécution de code arbitraire à distance ou un déni de service à distance sur des équipements avec une fonction d'IP Tunneling activée ; CVE-2020-11897 : des paquets IPv6 mal formés permettent une exécution de code arbitraire à distance [1] ; CVE-2020-11901 : une réponse DNS mal formée permet une exécution de code arbitraire à distance. Si ces vulnérabilités sont jugées critiques, leur impact est atténué par les conditions d’exploitabilité. Il convient donc de vérifier dans un premier temps si les équipements en bordure de réseau sont dans une configuration vulnérable. Si c'est le cas, il faut alors appliquer les mises à jour si elles sont disponibles ou mettre en œuvre les mesures de contournement. [mise à jour du 26 octobre 2020] Les avis de sécurité Schneider Electric SEVD-2020-174-01 et SEVD-2020-175-01 ont été mis à jour le 22 octobre 2020 suite à la découverte d'impacts supplémentaires sur les produits Schneider. Des correctifs sont en cours de développement, certains ont déjà été publiés et des mesures de contournement sont identifiées et listées dans les avis à jour. [1] cette vulnérabilité a été corrigée dans la version 5.0.1.35, sans être accompagnée d'un avis de sécurité à l'époque de sa mise à disposition.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2020-006765Treck TCP/IP stack における境界外読み取りに関する脆弱性

Treck TCP/IP stack には、境界外読み取りに関する脆弱性が存在します。

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
Action
A fix is now available in product releases V3.2IE25 and above. For product release prior to V3.2IE25, apply the mitigations detailed in the Recommended Mitigations section and contact your local technical support for more information.
Workaround
A mitigation or workaround reference is available from the source linked below; validate it against the affected product and version.
04

Evidence and provenance

Published 17 Jun 2020 · Last source change 4 Aug 2024, 11:42 UTC · CWE-125 · Out-of-bounds Read

CVE recordCVE.org · 5.1
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2020-4242
Product sourceVendor CSAF · Schneider Electric CPCERT
Remediation sourceVendor CSAF · Schneider Electric CPCERT
CWE sourceNIST NVD
NVD statusNVD modified after enrichment

Missing structured fields: affected product. Missing data is not evidence of low risk; review the primary advisory.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    n/a · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    n/a · Fixed: A fix is now available in product releases V3.2IE25 and above. For product release prior to V3.2IE25, apply the mitigations detailed in the Recommended Mitigations section and contact your local technical support for more information.
    Schneider Electric CPCERT ↗
  2. Remediation statusRemediation status changed from Mitigation available to Patch available.
    Before
    Mitigation available
    After
    Patch available
    Schneider Electric CPCERT ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Mitigation reference recorded
Fixed release recorded from official guidance
ENISA EUVD · EUVD-2020-4242↗Schneider Electric CPCERT security advisory↗CVE authority or vendor reference↗Vendor advisory↗Public exploit reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2020-11905 · cve.blacktree.nl