BlackTreeIndependent security intelligence

Full vulnerability report · 2021

CVE-2021-31345High confidence

A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303), PLUSCONTROL 1st Gen (All versions)

Siemens · Capital Embedded AR Classic 431-422

7.5HighCVSS 3.1

Recommended action

Within 7 days

High technical severity; 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.

4 current

SSA-620288 · CSAF 2.0 · revision 4 · interimSiemens ProductCERTSSA-620288: Multiple Vulnerabilities (NUCLEUS:13) in Capital Embedded AR Classic

2 known affected

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

Capital Embedded AR Classic 431-422
Capital Embedded AR Classic R20-11

Summary: The total length of an UDP payload (set in the IP header) is unchecked. This may lead to various side effects, including Information Leak and Denial-of-Service conditions, depending on a user-defined applications that runs on top of the UDP protocol. (FSMD-2021-0006)
Remediation: Update to V2303 or later version

SSA-114589 · CSAF 2.0 · revision 4 · interimSiemens ProductCERTSSA-114589: Multiple Vulnerabilities in Nucleus RTOS based APOGEE, TALON and Desigo PXC/PXM Products

23 known affected

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

APOGEE MBC (PPC) (BACnet)
APOGEE MBC (PPC) (P2 Ethernet)
APOGEE MEC (PPC) (BACnet)
APOGEE MEC (PPC) (P2 Ethernet)
APOGEE PXC Compact (BACnet)
APOGEE PXC Compact (P2 Ethernet)
APOGEE PXC Modular (BACnet)
APOGEE PXC Modular (P2 Ethernet)
Desigo PXC00-E.D
Desigo PXC00-U
Desigo PXC001-E.D
Desigo PXC12-E.D

Summary: The total length of an UDP payload (set in the IP header) is unchecked. This may lead to various side effects, including Information Leak and Denial-of-Service conditions, depending on a user-defined applications that runs on top of the UDP protocol. (FSMD-2021-0006)
Remediation: Update to V3.5.4 or later version

SSA-845392 · CSAF 2.0 · revision 1 · finalSiemens ProductCERTSSA-845392: Multiple Vulnerabilities in Nucleus RTOS based Siemens Energy PLUSCONTROL 1st Gen Devices

1 known affected

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

PLUSCONTROL 1st Gen

Summary: The total length of an UDP payload (set in the IP header) is unchecked. This may lead to various side effects, including Information Leak and Denial-of-Service conditions, depending on a user-defined applications that runs on top of the UDP protocol. (FSMD-2021-0006)
Remediation: PLUSCONTROL devices are typically located in a separate LAN segment of energy transmission solutions, where an attacker could use these vulnerabilities to disrupt SER messages or Trace functionalities. Therefore, review the status of the defense in depth recommendations that apply to your specific deployment and align as needed. Especially the measures on the network layer to prevent accessibility from other network segments.

SSA-044112 · CSAF 2.0 · revision 2 · finalSiemens ProductCERTSSA-044112: Multiple Vulnerabilities (NUCLEUS:13) in the TCP/IP Stack of Nucleus RTOS

3 known affected

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

Nucleus NET
Nucleus ReadyStart V3
Nucleus Source Code

Summary: The total length of an UDP payload (set in the IP header) is unchecked. This may lead to various side effects, including Information Leak and Denial-of-Service conditions, depending on a user-defined applications that runs on top of the UDP protocol. (FSMD-2021-0006)
Remediation: Update to V2017.02.4 or later version

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-2021-18255

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; prioritise exposed affected systems while verifying vendor guidance.

Patch available

What, why and how

A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303), PLUSCONTROL 1st Gen (All versions). The total length of an UDP payload (set in the IP header) is unchecked. This may lead to various side effects, including Information Leak and Denial-of-Service conditions, depending on a user-defined applications that runs on top of the UDP protocol. (FSMD-2021-0006)

What

Why

The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties.

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

Why

The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties.

How

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.

None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path: a network path → Improper Validation of Specified Quantity in Input → 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-1284 ↗
CWE-1284: Improper Validation of Specified Quantity in Input. The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties.
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:H/I:N/A:N
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.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.

NetworkUnauthenticatedCWE-1284

Official authority intelligence

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

ENISA EUVD · EUVD-2021-18255Official EUVD mapping

0 linked advisory records.

Official EUVD record

CERT-FR · French · CERTFR-2022-AVI-018Multiples vulnérabilités dans les produits Siemens

De multiples vulnérabilités ont été découvertes dans les produits Siemens. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, un déni de service à distance et un contournement de la politique de sécurité.

Official advisory

CERT-FR · French · CERTFR-2022-AVI-002Multiples vulnérabilités dans Google Android

d?id=CVE-2021-30285 Référence CVE CVE-2021-30287 https://www.cve.org/CVERecord?id=CVE-2021-30287 Référence CVE CVE-2021-30300 https://www.cve.org/CVERecord?id=CVE-2021-30300 Référence CVE CVE-2021-30301 https://www.cve.org/CVERecord?id=CVE-2021-30301 Référence CVE CVE-2021-30307 https://www.cve.org/CVERecord?id=CVE-2021-30307 Référence CVE CVE-2021-30308 https://www.cve.org/CVERecord?id=CVE-2021-30308 Référence CVE CVE-2021-30311 https://www.cve.org/CVERecord?id=CVE-2021-30311 Référence CVE CVE-2021-30319 https://www.cve.org/CVERecord?id=CVE-2021-30319 Référence CVE CVE-2021-30353 https://www.cve.org/CVERecord?id=CVE-2021-30353 Référence CVE CVE-2021-31345 https://www.cve.org/CVERecord?id=CVE-2021-31345 Référence CVE CVE-2021-31346 https://www.cve.org/CVERecord?id=CVE-2021-31346 Référence CVE CVE-2021-31889 https://www.cve.org/CVERecord?id=CVE-2021-31889 Référence CVE CVE-2021-31890 https://www.cve.org/CVERecord?id=CVE-2021-31890 Référence CVE CVE-2021-39618 https://www.cve.org/CVERecord?id=CVE-2021-39618 Référence CVE CVE-2021-39620 https://www.cve.org/CVERecord?id=CVE-2021-39620 Référence CVE CVE-2021-39621 https://www.cve.org/CVERecord?id=CVE-2021-39621 Référence CVE CVE-2021-39622 https://www.cve.org/CVERecord?id=CVE-2021-39622 Référence CVE CVE-2021-39623 https://www.cve.org/CVERecord?id=

Official advisory

CERT-FR · French · CERTFR-2021-AVI-949Multiples vulnérabilités dans les produits Siemens

d?id=CVE-2020-14396 Référence CVE CVE-2020-14397 https://www.cve.org/CVERecord?id=CVE-2020-14397 Référence CVE CVE-2020-14398 https://www.cve.org/CVERecord?id=CVE-2020-14398 Référence CVE CVE-2020-14401 https://www.cve.org/CVERecord?id=CVE-2020-14401 Référence CVE CVE-2020-14402 https://www.cve.org/CVERecord?id=CVE-2020-14402 Référence CVE CVE-2020-14403 https://www.cve.org/CVERecord?id=CVE-2020-14403 Référence CVE CVE-2020-14404 https://www.cve.org/CVERecord?id=CVE-2020-14404 Référence CVE CVE-2020-14405 https://www.cve.org/CVERecord?id=CVE-2020-14405 Référence CVE CVE-2021-31344 https://www.cve.org/CVERecord?id=CVE-2021-31344 Référence CVE CVE-2021-31345 https://www.cve.org/CVERecord?id=CVE-2021-31345 Référence CVE CVE-2021-31346 https://www.cve.org/CVERecord?id=CVE-2021-31346 Référence CVE CVE-2021-31881 https://www.cve.org/CVERecord?id=CVE-2021-31881 Référence CVE CVE-2021-31882 https://www.cve.org/CVERecord?id=CVE-2021-31882 Référence CVE CVE-2021-31883 https://www.cve.org/CVERecord?id=CVE-2021-31883 Référence CVE CVE-2021-31884 https://www.cve.org/CVERecord?id=CVE-2021-31884 Référence CVE CVE-2021-31885 https://www.cve.org/CVERecord?id=CVE-2021-31885 Référence CVE CVE-2021-31886 https://www.cve.org/CVERecord?id=CVE-2021-31886 Référence CVE CVE-2021-31887 https://www.cve.org/CVERecord?id=

Official advisory

CERT-FR · French · CERTFR-2021-AVI-854Multiples vulnérabilités dans les produits Siemens

d?id=CVE-2020-27736 Référence CVE CVE-2020-27737 https://www.cve.org/CVERecord?id=CVE-2020-27737 Référence CVE CVE-2020-27738 https://www.cve.org/CVERecord?id=CVE-2020-27738 Référence CVE CVE-2020-28388 https://www.cve.org/CVERecord?id=CVE-2020-28388 Référence CVE CVE-2021-25663 https://www.cve.org/CVERecord?id=CVE-2021-25663 Référence CVE CVE-2021-25664 https://www.cve.org/CVERecord?id=CVE-2021-25664 Référence CVE CVE-2021-25677 https://www.cve.org/CVERecord?id=CVE-2021-25677 Référence CVE CVE-2021-27393 https://www.cve.org/CVERecord?id=CVE-2021-27393 Référence CVE CVE-2021-31344 https://www.cve.org/CVERecord?id=CVE-2021-31344 Référence CVE CVE-2021-31345 https://www.cve.org/CVERecord?id=CVE-2021-31345 Référence CVE CVE-2021-31346 https://www.cve.org/CVERecord?id=CVE-2021-31346 Référence CVE CVE-2021-31881 https://www.cve.org/CVERecord?id=CVE-2021-31881 Référence CVE CVE-2021-31882 https://www.cve.org/CVERecord?id=CVE-2021-31882 Référence CVE CVE-2021-31883 https://www.cve.org/CVERecord?id=CVE-2021-31883 Référence CVE CVE-2021-31884 https://www.cve.org/CVERecord?id=CVE-2021-31884 Référence CVE CVE-2021-31885 https://www.cve.org/CVERecord?id=CVE-2021-31885 Référence CVE CVE-2021-31886 https://www.cve.org/CVERecord?id=CVE-2021-31886 Référence CVE CVE-2021-31887 https://www.cve.org/CVERecord?id=

Official advisory

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: Capital Embedded AR Classic 431-422; Capital Embedded AR Classic R20-11
Fixed: No fixed version is explicitly recorded in the structured CVE data.
Action: Update to V2303 or later version
Workaround: No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.

Evidence and provenance

Published 9 Nov 2021 · Last source change 11 Mar 2025, 09:47 UTC · CWE-1284 · Improper Validation of Specified Quantity in Input

CVE recordCVE.org · 5.1

CVSS sourceCNA

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-2021-18255

Product sourceVendor CSAF · Siemens ProductCERT

Remediation sourceVendor CSAF · Siemens ProductCERT

CWE sourceCNA

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.

2021-11-09CVE published

ENISA EUVD · EUVD-2021-18255↗Vendor CSAF · Siemens ProductCERT↗CVE authority or vendor reference↗Vendor advisory↗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.

A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303), PLUSCONTROL 1st Gen (All versions)

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

EUVD-2021-18255

What, why and how

Exploit reality and attack path

Official authority intelligence

Patch and workaround

Evidence and provenance

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