CVE-2020-36475
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 2%
Description
An issue was discovered in Mbed TLS before 2.25.0 (and before 2.16.9 LTS and before 2.7.18 LTS). The calculations performed by mbedtls_mpi_exp_mod are not limited; thus, supplying overly large parameters could lead to denial of service when generating Diffie-Hellman key pairs.
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
Debian Linux· Debiandrupal
95%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)
Logo! Cmr2020· Siemensdevice
80%All versions
Logo! Cmr2040· Siemensdevice
80%All versions
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (6)
PatchThird Party Advisory
Source: [email protected]
https://cert-portal.siemens.com/productcert/pdf/ssa-756638.pdfRelease NotesThird Party Advisory
Source: [email protected]
https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.9Release NotesThird Party Advisory
Source: [email protected]
https://github.com/ARMmbed/mbedtls/releases/tag/v2.25.0Release NotesThird Party Advisory
Source: [email protected]
https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.18Mailing ListThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2021/11/msg00021.htmlMailing ListThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2022/12/msg00036.htmlCVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-131
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