{"schemaVersion":3,"id":"CVE-2025-54764","aliases":["ALPINE-CVE-2025-54764","UBUNTU-CVE-2025-54764","DEBIAN-CVE-2025-54764"],"status":"published","duplicateOf":null,"title":null,"description":"Mbed TLS before 3.6.5 allows a local timing attack against certain RSA operations, and direct calls to mbedtls_mpi_mod_inv or mbedtls_mpi_gcd.","dates":{"published":"2025-10-20T00:00:00.000Z","modified":"2025-10-21T13:55:01.934Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":6.2,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":6.2,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Alpine","score":6.2,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","exploitability":6.4,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":6.2,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","exploitability":6.4,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":6.2,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","exploitability":6.4,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":6.2,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00221,"percentile":0.11922,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00221},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00206,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00206,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00206,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00206,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00206,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00206,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00221,"percentile":0.11922}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00221,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00221,"percentile":0.11922}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[{"id":"REF_C24D73182B444BA5","name":"Exploit Reference (mbed-tls.readthedocs.io)","source":"reference","url":"https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-10-ssbleed-mstep/","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-208","name":"Observable Timing Discrepancy","description":"Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/208.html"}],"affected":[{"vendor":"alpine","product":"mbedtls","name":"mbedtls","label":"mbedtls","ecosystem":"Alpine Linux","cpePart":null,"purl":"pkg:apk/alpine/mbedtls","purlType":"apk","versions":[{"text":"< 3.6.5-r0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.6.5-r0","eol":null,"hubHref":null},{"vendor":"arm","product":"mbed_tls","name":"mbed tls","label":"mbed_tls","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 3.6.5","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.6.5","eol":null,"hubHref":"/vendor/arm/mbed_tls"},{"vendor":"debian","product":"mbedtls","name":"mbedtls","label":"mbedtls","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/mbedtls","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 3.6.5-0.1~deb13u1","noFixRecorded":false,"fixedIn":null},{"text":"< 3.6.5-0.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 3.6.5-0.1~deb13u1 | < 3.6.5-0.1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"mbedtls","name":"mbedtls","label":"mbedtls","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/mbedtls","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null}],"affectedCount":4,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/","label":"mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/","hostname":"mbed-tls.readthedocs.io","tags":["REPORT","Vendor Advisory"]},{"url":"https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-10-ssbleed-mstep/","label":"mbed-tls.readthedocs.io/en/…","hostname":"mbed-tls.readthedocs.io","tags":["REPORT","Exploit","Vendor Advisory"]},{"url":"https://security.alpinelinux.org/vuln/CVE-2025-54764","label":"security.alpinelinux.org/vuln/CVE-2025-54764","hostname":"security.alpinelinux.org","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2025-54764","label":"ubuntu.com/security/CVE-2025-54764","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-54764","label":"www.cve.org/CVERecord?id=CVE-2025-54764","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://github.com/Mbed-TLS/mbedtls/compare/8f4779c6fa40374f88404787bebad85cc7e9969b..eb346801263ba4612b5e29633bd55fe18943ca65","label":"github.com/Mbed-TLS/…","hostname":"github.com","tags":["REPORT"]},{"url":"https://github.com/Mbed-TLS/mbedtls/compare/9b54f934588bc373f3c3f5d45b5a3ad0ae003082..99270322ffac3546f813b1069fd6efb667cdce3f","label":"github.com/Mbed-TLS/…","hostname":"github.com","tags":["REPORT"]},{"url":"https://github.com/Mbed-TLS/mbedtls/compare/246d86b941ef2d2bdeabd7035efe7200bc609b91..a08faf90700e46f6aa2a6e3fee8a6a71ddb816ce","label":"github.com/Mbed-TLS/…","hostname":"github.com","tags":["REPORT"]},{"url":"https://github.com/Mbed-TLS/mbedtls/compare/246d86b941ef2d2bdeabd7035efe7200bc609b91..30f073236922fe4e528fdf82eb442babb50516fa","label":"github.com/Mbed-TLS/…","hostname":"github.com","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2025-54764","label":"security-tracker.debian.org/tracker/CVE-2025-54764","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2025:15747-1","OPENSUSE-SU-2026:21144-1"],"duplicates":[],"related":["OPENSUSE-SU-2025:15747-1","OPENSUSE-SU-2026:21144-1"]},"timeline":[{"kind":"published","date":"2025-10-20T00:00:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2025-10-21T13:55:01.934Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":35,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T17:26:31.694Z","stale":false,"partial":false}}