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| Vulnerability ID | VCID-ryyu-er25-v3dt |
| Aliases |
CVE-2021-36647
|
| Summary | Use of a Broken or Risky Cryptographic Algorithm in the function mbedtls_mpi_exp_mod() in lignum.c in Mbed TLS Mbed TLS all versions before 3.0.0, 2.27.0 or 2.16.11 allows attackers with access to precise enough timing and memory access information (typically an untrusted operating system attacking a secure enclave such as SGX or the TrustZone secure world) to recover the private keys used in RSA. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 4.2 |
| Risk | 2.1 |
| Affected and Fixed Packages | Package Details |
| Reference id | Reference type | URL |
|---|---|---|
| https://api.first.org/data/v1/epss?cve=CVE-2021-36647 | ||
| https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-36647 | ||
| cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:* | https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:* | |
| CVE-2021-36647 | https://nvd.nist.gov/vuln/detail/CVE-2021-36647 | |
| Load-Step.pdf | https://kouzili.com/Load-Step.pdf | |
| mbedtls-security-advisory-2021-07-1 | https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-07-1 | |
| releases | https://github.com/ARMmbed/mbedtls/releases/ |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
| Percentile | 0.06802 |
| EPSS Score | 0.0003 |
| Published At | Sept. 9, 2025, 12:55 p.m. |
| Date | Actor | Action | Source | VulnerableCode Version |
|---|---|---|---|---|
| 2025-07-31T09:46:19.794006+00:00 | Vulnrichment | Import | https://github.com/cisagov/vulnrichment/blob/develop/2021/36xxx/CVE-2021-36647.json | 37.0.0 |