{"id":"CVE-2020-36475","aliases":["DEBIAN-CVE-2020-36475","DLA-2826-1","DLA-3249-1","EUVD-2020-23961","GHSA-7qm6-rr75-xc68","JLSEC-2025-210","UBUNTU-CVE-2020-36475"],"status":"published","title":"An issue was discovered in Mbed TLS before 2.25.0 (and before 2.16.9 LTS and before 2.7.18 LTS)....","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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.01917,"percentile":0.80138,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-131"],"published":"2021-08-23T00:00:00Z","modified":"2026-10-26T12:02:49Z","fixes":[{"ecosystem":"Debian:12","package":"mbedtls","fixed_in":["2.16.9-0.1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"mbedtls","fixed_in":["2.16.9-0.1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"mbedtls","fixed_in":["2.16.9-0.1"],"sources":["osv"]},{"ecosystem":"Julia","package":"MbedTLS_jll","fixed_in":["2.25.0+0"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"mbedtls","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.16.9-0.1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"mbedtls","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.16.9-0.1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"mbedtls","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.16.9-0.1"}]}]},{"source":"osv","ecosystem":"Debian:9","package":"mbedtls","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.2-1+deb9u4"}]}],"versions":["2.4.2-1","2.4.2-1+deb9u1","2.4.2-1+deb9u1~bpo8+1","2.4.2-1+deb9u2","2.4.2-1+deb9u3"],"bundled":6},{"source":"osv","ecosystem":"Debian:10","package":"mbedtls","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.16.9-0~deb10u1"}]}],"versions":["2.16.0-1","2.16.2-1","2.16.3-1","2.16.4-1","2.16.5-1"],"bundled":18},{"source":"osv","ecosystem":"Julia","package":"MbedTLS_jll","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.25.0+0"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"mbedtls","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1.2-1","2.2.0-1","2.2.1-1","2.2.1-2","2.2.1-2ubuntu0.1","2.2.1-2ubuntu0.2","2.2.1-2ubuntu0.3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"mbedtls","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.5.1-1ubuntu1","2.6.0-1","2.7.0-2","2.8.0-1","2.8.0-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"mbedtls","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.16.2-1","2.16.3-1","2.16.4-1ubuntu2","2.16.4-1ubuntu2+esm1"]}],"products":[{"vendor":"arm","product":"mbed_tls"},{"vendor":"debian","product":"debian_linux"},{"vendor":"siemens","product":"logo\\!_cmr2020_firmware"},{"vendor":"siemens","product":"logo\\!_cmr2040_firmware"},{"vendor":"siemens","product":"simatic_rtu3000c_firmware"},{"vendor":"siemens","product":"simatic_rtu3030c_firmware"},{"vendor":"siemens","product":"simatic_rtu3031c_firmware"},{"vendor":"siemens","product":"simatic_rtu3041c_firmware"}],"references":[{"url":"https://github.com/ARMmbed/mbedtls/releases/tag/v2.25.0","tags":["x_transferred","Release Notes","Third Party Advisory","advisory","web","report"]},{"url":"https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.9","tags":["x_transferred","Release Notes","Third Party Advisory","advisory","web","report"]},{"url":"https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.18","tags":["x_transferred","Release Notes","Third Party Advisory","advisory","web","report"]},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-756638.pdf","tags":["x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://lists.debian.org/debian-lts-announce/2021/11/msg00021.html","tags":["mailing-list","x_transferred","Mailing List","Third Party Advisory","advisory","web"]},{"url":"https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html","tags":["mailing-list","x_transferred","Mailing List","Third Party Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-36475"},{"url":"https://github.com/advisories/GHSA-7qm6-rr75-xc68"},{"url":"https://security-tracker.debian.org/tracker/CVE-2020-36475","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-36475","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-36475","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2020-36475","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.","status":"published","published":"2021-08-23T00:00:00Z","modified":"2024-08-04T17:30:08.223Z","updated_at":"2026-11-02T14:35:55.128961Z"}],"euvd":[{"id":"EUVD-2020-23961","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.","status":"published","published":"2021-08-23T00:00:00Z","modified":"2024-08-04T17:30:08Z","updated_at":"2026-11-03T03:07:03.010139Z"}],"ghsa":[{"id":"GHSA-7qm6-rr75-xc68","title":"An issue was discovered in Mbed TLS before 2.25.0 (and before 2.16.9 LTS and before 2.7.18 LTS)....","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.","status":"published","published":"2022-05-24T19:11:59Z","modified":"2023-02-03T05:01:30Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-131"],"updated_at":"2026-11-02T14:52:59.355645Z"}],"nvd":[{"id":"CVE-2020-36475","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.","status":"published","published":"2021-08-23T02:15:06.93Z","modified":"2026-06-17T03:15:34.277Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-131"],"updated_at":"2026-11-02T14:06:45.704484Z"}],"osv":[{"id":"CVE-2020-36475","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.","status":"published","published":"2021-08-23T02:15:06.93Z","modified":"2026-10-24T10:47:50.006721226Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:16.936975Z"},{"id":"DEBIAN-CVE-2020-36475","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.","status":"published","published":"2021-08-23T02:15:06.93Z","modified":"2026-10-26T12:02:49.328315287Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:34.019707Z"},{"id":"JLSEC-2025-210","title":"An issue was discovered in Mbed TLS before 2.25.0 (and before 2.16.9 LTS and before 2.7.18 LTS)","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.","status":"published","published":"2025-11-21T15:59:04.054Z","modified":"2026-07-23T22:30:18.889770985Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:47:17.805107Z"},{"id":"UBUNTU-CVE-2020-36475","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.","status":"published","published":"2021-08-23T02:15:00Z","modified":"2026-04-22T12:42:00.699006Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:25.179924Z"},{"id":"DLA-2826-1","title":"mbedtls - security update","status":"published","published":"2021-11-23T00:00:00Z","modified":"2026-03-09T01:19:10.52461Z","updated_at":"2026-11-02T15:46:11.189256Z"},{"id":"DLA-3249-1","title":"mbedtls - security update","status":"published","published":"2022-12-26T00:00:00Z","modified":"2026-03-09T01:22:32.743764Z","updated_at":"2026-11-02T15:46:11.734021Z"}]}}