VulnerabilityModified
CVE-2020-36478
An issue was discovered in Mbed TLS before 2.25.0 (and before 2.16.9 LTS and before 2.7.18 LTS).
HIGH 7.5EPSS 1.18%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.18%). 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). 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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 1.18% probability · 66th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-295
- 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/issues/3629Exploit, 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/issues/3629Exploit, 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.