CVE-2020-36477
CVSS V2 Medium 4.3
CVSS V3 Medium 5.9
Description
An issue was discovered in Mbed TLS before 2.24.0. The verification of X.509 certificates when matching the expected common name (the cn argument of mbedtls_x509_crt_verify) with the actual certificate name is mishandled: when the subjecAltName extension is present, the expected name is compared to any name in that extension regardless of its type. This means that an attacker could impersonate a 4-byte or 16-byte domain by getting a certificate for the corresponding IPv4 or IPv6 address (this would require the attacker to control that IP address, though).
Overview
- CVE ID
- CVE-2020-36477
- Assigner
- cve@mitre.org
- Vulnerability Status
- Analyzed
- Published Version
- 2021-08-23T02:15:07
- Last Modified Date
- 2023-01-13T19:59:16
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:* | 1 | OR | 2.24.0 |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:M/Au:N/C:N/I:P/A:N
- Access Vector
- NETWORK
- Access Compatibility
- MEDIUM
- Authentication
- NONE
- Confidentiality Impact
- NONE
- Integrity Impact
- PARTIAL
- Availability Impact
- NONE
- Base Score
- 4.3
- Severity
- MEDIUM
- Exploitability Score
- 8.6
- Impact Score
- 2.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- Attack Vector
- NETWORK
- Attack Compatibility
- HIGH
- Privileges Required
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- NONE
- Availability Impact
- NONE
- Base Score
- 5.9
- Base Severity
- MEDIUM
- Exploitability Score
- 2.2
- Impact Score
- 3.6
References
| Reference URL | Reference Tags |
|---|---|
| https://github.com/ARMmbed/mbedtls/issues/3498 | Third Party Advisory |
| https://github.com/ARMmbed/mbedtls/releases/tag/v2.24.0 | Release Notes Third Party Advisory |
| https://security.gentoo.org/glsa/202301-08 |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2020-36477 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-36477 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 06:55:51 | Added to TrackCVE | |||
| 2022-12-05 08:41:27 | 2021-08-23T02:15Z | 2021-08-23T02:15:07 | CVE Published Date | updated |
| 2022-12-05 08:41:27 | 2021-08-26T23:48:23 | CVE Modified Date | updated | |
| 2022-12-05 08:41:27 | Analyzed | Vulnerability Status | updated | |
| 2023-01-12 05:12:42 | 2023-01-11T07:15:11 | CVE Modified Date | updated | |
| 2023-01-12 05:12:42 | Analyzed | Undergoing Analysis | Vulnerability Status | updated |
| 2023-01-12 05:12:43 | References | updated | ||
| 2023-01-13 20:16:37 | 2023-01-13T19:59:16 | CVE Modified Date | updated | |
| 2023-01-13 20:16:37 | Undergoing Analysis | Analyzed | Vulnerability Status | updated |