An issue was discovered in Mbed TLS before 2.25.0 (and before 2.16.9 LTS and before…
Priority LOW 37CWE-131Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-131 and the CVSS impact.
Summary
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.
Why it matters now
EPSS 0.01917 79th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 15
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:* | before 2.7.18; 2.8.0 to before 2.16.9; 2.17.0 to before 2.25.0 | Vulnerable | Arm |
| cpe:2.3:o:siemens:logo\!_cmr2020_firmware:*:*:*:*:*:*:*:* | before 2.2 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:logo\!_cmr2020:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:logo\!_cmr2040_firmware:*:*:*:*:*:*:*:* | before 2.2 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:logo\!_cmr2040:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:simatic_rtu3031c_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Siemens |
| cpe:2.3:h:siemens:simatic_rtu3031c:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:simatic_rtu3041c_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Siemens |
| cpe:2.3:h:siemens:simatic_rtu3041c:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:simatic_rtu3030c_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Siemens |
- cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:* Versions before 2.7.18; 2.8.0 to before 2.16.9; 2.17.0 to before 2.25.0 Vulnerable ·Arm
- cpe:2.3:o:siemens:logo\!_cmr2020_firmware:*:*:*:*:*:*:*:* Versions before 2.2 Vulnerable ·Siemens
- cpe:2.3:h:siemens:logo\!_cmr2020:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:logo\!_cmr2040_firmware:*:*:*:*:*:*:*:* Versions before 2.2 Vulnerable ·Siemens
- cpe:2.3:h:siemens:logo\!_cmr2040:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:simatic_rtu3031c_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Siemens
- cpe:2.3:h:siemens:simatic_rtu3031c:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:simatic_rtu3041c_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Siemens
- cpe:2.3:h:siemens:simatic_rtu3041c:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:simatic_rtu3030c_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Siemens
Show 5 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:h:siemens:simatic_rtu3030c:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:simatic_rtu3000c_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Siemens |
| cpe:2.3:h:siemens:simatic_rtu3000c:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
- cpe:2.3:h:siemens:simatic_rtu3030c:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:simatic_rtu3000c_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Siemens
- cpe:2.3:h:siemens:simatic_rtu3000c:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2020-36475
- 2026-10-03 Alias added: GHSA-7qm6-rr75-xc68
References
Advisory 5
- https://github.com/ARMmbed/mbedtls/releases/tag/v2.25.0
- https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.9
- https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.18
- [debian-lts-announce] 20211123 [SECURITY] [DLA 2826-1] mbedtls security update
- [debian-lts-announce] 20221225 [SECURITY] [DLA 3249-1] mbedtls security update
Sources
- CVE-2020-36475 · CVE Program
- CVE-2020-36475 · NVD
- FIRST EPSS
- GHSA-7qm6-rr75-xc68 · GitHub Advisory Database · CC BY 4.0
- CVE-2020-36475 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences