CVE-2020-36478

HIGH
7.5
CVSS Score
Published: August 23, 2021 at 12:00 AM UTC
Updated: June 17, 2026 at 03:15 AM UTC
14 products affected across 3 vendorsDebian Linuxmbed TLSLogo ! CMR2020 Firmware

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Severity
HIGH7.5
Exploit prediction
EPSS 1%

Description

An issue was discovered in Mbed TLS before 2.25.0 (and before 2.16.9 LTS and before 2.7.18 LTS). A NULL algorithm parameters entry looks identical to an array of REAL (size zero) and thus the certificate is considered valid. However, if the parameters do not match in any way, then the certificate should be considered invalid.

Affected

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

v < 2.7.182.17.0 ≤ v < 2.25.02.8.0 ≤ v < 2.16.9
Affected range stops below 2.16.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.25.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.7.18, so it looks safe — our inference, not a vendor statement
v < 2.2
Affected range stops below 2.2, so it looks safe — our inference, not a vendor statement
siemens-logo-cmr2020 (same device)
v < 2.2
Affected range stops below 2.2, so it looks safe — our inference, not a vendor statement
siemens-logo-cmr2040 (same device)
All versions
siemens-simatic-rtu3000c (same device)
All versions
siemens-simatic-rtu3030c (same device)
All versions
siemens-simatic-rtu3031c (same device)
All versions
siemens-simatic-rtu3041c (same device)
All versions
All versions

Remediation

No guide yet

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

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-295

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