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Full vulnerability report · 2020
CVE-2020-11902High confidence

The Treck TCP/IP stack before 6.0.1.66 has an IPv6OverIPv4 tunneling Out-of-bounds Read

n/a · n/a

7.3HighCVSS 3.1
Recommended action
Within 7 days

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

Patch available
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
17 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 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
  • Schneider Electric APC 3-Phase Power Distribution Products: Modular 150 and 175 kVA PDU NAM (XRDP) NMC2 AOS V6.9.4 and earlier
  • Schneider Electric APC 3-Phase Power Distribution Products: 400 and 500 kVA PMM (PMM) NMC2 AOS V6.9.4 and earlier
  • Schneider Electric APC 3-Phase Power Distribution Products: Modular PDU/RPP (XRDP2G) NMC2 AOS V6.9.4 and earlier
  • Schneider Electric APC Rack Power Distribution Units (rPDU) Embedded NMC2: 2G Metered/Switched Rack PDUs with embedded NMC2 NMC2 AOS V6.9.4 and earlier
Summary
Network Management Card Family - 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.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

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-2020-4239

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

High 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 an IPv6OverIPv4 tunneling Out-of-bounds Read.

What

The Treck TCP/IP stack before 6.0.1.66 has an IPv6OverIPv4 tunneling 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 a network path 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 an IPv6OverIPv4 tunneling 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 a network path 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
a network path → Out-of-bounds Read → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
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:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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

AVNetworkAttack vector: The vulnerable component can be reached over a 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.CLowConfidentiality impact: A successful attack can cause a limited loss.ILowIntegrity impact: A successful attack can cause a limited loss.ALowAvailability impact: A successful attack can cause a limited loss.
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.
NetworkUnauthenticatedCWE-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-W-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
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
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
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; Schneider Electric VW3A3720, VW3A3721 Altivar Process Communication Modules All Versions prior to V1.15IE25; Schneider Electric VW3A3720, VW3A3721 Altivar Process Communication Modules version V1.15IE25 and prior; Schneider Electric ACE850 Sepam communication interface all versions; Schneider Electric Acti9 Smartlink EL B A9XELC08 all versions; Schneider Electric Acti9 Smartlink IP all versions; Schneider Electric Acti9 PowerTag Link C (Formerly named Acti9 Smartlink EL D) version V1.7.4 and prior; Schneider Electric Andover Continuum controller models all versions; Schneider Electric Wiser Energy IP module by Schneider Electric (EER31800) version V1.7.4 and prior; Schneider Electric Wiser Energy IP module by Clipsal (EER72600) version V1.7.4 and prior; Schneider Electric Gateway Connector by Elko (EKO01827) version V1.7.4 and prior; Schneider Electric Acti9 PowerTag Link / HD version prior to 001.008.007; Schneider Electric Acti9 Smartlink SI D version prior to 002.004.002; Schneider Electric Acti9 Smartlink SI B version prior to 002.004.002; Schneider Electric EGX150/Link150 Ethernet Gateway version V5.1.15 and prior; Schneider Electric EGX150/Link150 Ethernet Gateway V5.1.18; Schneider Electric eIFE Ethernet Interface for MasterPact MTZ drawout circuit breakers Firmware versions prior to V4.001.000; Schneider Electric EcoStruxure Building SmartX IP RP Controllers All versions; Schneider Electric IFE Gateway Firmware versions prior to V3.011.003; and 4 more
Fixed
Schneider Electric ATV340E Altivar Machine Drives V3.2IE25; Schneider Electric ATV630/650/660/680/6A0/6B0 Altivar Process Drives V3.3IE26; Schneider Electric ATV930/950/960/980/9A0/9B0 Altivar Process Drives V3.3IE26; Schneider Electric ATV6000 Medium Voltage Altivar Process Drives Version 3.3IE26 and later; Schneider Electric SCADAPack 32 RTU version 2.25 and later; Schneider Electric TM3BC bus coupler module – EIP V2.2.1.1; Schneider Electric TM3BC bus coupler module - SL V2.1.1.1; Schneider Electric TM3BC bus coupler module - CANOpen V2.1.1.1; Schneider Electric ZBRCETH Modbus TCP communication <=SV:02.04 | <= PV:02 | <=RL:02; Schneider Electric Acti9 PowerTag Link C (Formerly named Acti9 Smartlink EL D) V6.2; Schneider Electric Wiser Energy IP module by Schneider Electric (EER31800) 6.2; Schneider Electric Wiser Energy IP module by Clipsal (EER72600) 6.2; Schneider Electric Gateway Connector by Elko (EKO01827) 6.2
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-2020-4239
Product sourceVendor CSAF · Schneider Electric CPCERT
Remediation sourceVendor CSAF · Schneider Electric CPCERT
CWE sourceNIST NVD
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Mitigation reference recorded
ENISA EUVD · EUVD-2020-4239↗Vendor CSAF · Schneider Electric CPCERT↗Vendor advisory↗Public exploit reference↗CVE authority or vendor 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-2020-11902 · cve.blacktree.nl