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CVE-2020-11637

Automation Runtime TFTP Service DoS Vulnerability

HIGH
7.5
CVSS Score
Published: October 15, 2020 at 03:08 PM UTC
Updated: June 17, 2026 at 02:50 AM UTC
2 products affected across 2 vendorsAutomation RuntimeAutomation Runtime

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Severity
HIGH7.5
Exploit prediction
EPSS 1%

Description

A memory leak in the TFTP service in B&R Automation Runtime versions <N4.26, <N4.34, <F4.45, <E4.53, <D4.63, <A4.73 and prior could allow an unauthenticated attacker with network access to cause a denial of service (DoS) condition.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Automation Runtime· Br Automation
95%
v ≤ 4.104.20 ≤ v < n4.264.30 ≤ v < n4.344.40 ≤ v < f4.454.50 ≤ v < e4.534.60 ≤ v < d4.634.70 ≤ v < a4.73
Affected range stops below a4.73, so it looks safe — our inference, not a vendor statement
Affected range stops below d4.63, so it looks safe — our inference, not a vendor statement
Affected range stops below e4.53, so it looks safe — our inference, not a vendor statement
Affected range stops below f4.45, so it looks safe — our inference, not a vendor statement
Affected range stops below n4.26, so it looks safe — our inference, not a vendor statement
Affected range stops below n4.34, so it looks safe — our inference, not a vendor statement
Automation Runtime· B and R
60%
v ≤ 4.1x4.2x ≤ v < N4.264.3x ≤ v < N4.344.4x ≤ v < F4.454.5x ≤ v < E4.534.6x ≤ v < D4.634.7x ≤ v < A4.734.2x4.3x4.4x4.5x4.6x4.7x
Affected range stops below A4.73, so it looks safe — our inference, not a vendor statement
Affected range stops below D4.63, so it looks safe — our inference, not a vendor statement
Affected range stops below E4.53, so it looks safe — our inference, not a vendor statement
Affected range stops below F4.45, so it looks safe — our inference, not a vendor statement
Affected range stops below N4.26, so it looks safe — our inference, not a vendor statement
Affected range stops below N4.34, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.br-automation.com/downloads_br_productcatalogue/assets/1595163815396-de-original-1.0.pdf

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-401

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