VulnerabilityModified
CVE-2020-36475
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.
HIGH 7.5EPSS 1.97%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.97%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.97% probability · 79th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-131
- Affected
- arm/mbed tls · siemens/logo\! cmr2020 firmware · siemens/logo\! cmr2040 firmware · siemens/simatic rtu3031c firmware · siemens/simatic rtu3041c firmware · siemens/simatic rtu3030c firmware · siemens/simatic rtu3000c firmware · debian/debian linux
- Source
- cve@mitre.org
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-756638.pdfPatch, Third Party Advisory
- https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.9Release Notes, Third Party Advisory
- https://github.com/ARMmbed/mbedtls/releases/tag/v2.25.0Release Notes, Third Party Advisory
- https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.18Release Notes, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/11/msg00021.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/12/msg00036.htmlMailing List, Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-756638.pdfPatch, Third Party Advisory
- https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.9Release Notes, Third Party Advisory
- https://github.com/ARMmbed/mbedtls/releases/tag/v2.25.0Release Notes, Third Party Advisory
- https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.18Release Notes, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/11/msg00021.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/12/msg00036.htmlMailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.