CVE-2021-36371
CVSS V2 Medium 4.3
CVSS V3 Low 3.7
Description
Emissary-Ingress (formerly Ambassador API Gateway) through 1.13.9 allows attackers to bypass client certificate requirements (i.e., mTLS cert_required) on backend upstreams when more than one TLSContext is defined and at least one configuration exists that does not require client certificate authentication. The attacker must send an SNI specifying an unprotected backend and an HTTP Host header specifying a protected backend. (2.x versions are unaffected. 1.x versions are unaffected with certain configuration settings involving prune_unreachable_routes and a wildcard Host resource.)
Overview
- CVE ID
- CVE-2021-36371
- Assigner
- cve@mitre.org
- Vulnerability Status
- Analyzed
- Published Version
- 2021-07-09T21:15:08
- Last Modified Date
- 2021-07-14T14:57:33
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:a:getambassador:emissary-ingress:*:*:*:*:*:*:*:* | 1 | OR | 1.13.9 |
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:L/A:N
- Attack Vector
- NETWORK
- Attack Compatibility
- HIGH
- Privileges Required
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- NONE
- Availability Impact
- NONE
- Base Score
- 3.7
- Base Severity
- LOW
- Exploitability Score
- 2.2
- Impact Score
- 1.4
References
| Reference URL | Reference Tags |
|---|---|
| https://github.com/emissary-ingress/emissary/issues/3340 | Exploit Third Party Advisory |
| https://github.com/emissary-ingress/emissary/releases/tag/v2.0.0-ea | Release Notes Third Party Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-36371 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-36371 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 07:07:20 | Added to TrackCVE | |||
| 2022-12-05 05:43:23 | 2021-07-09T21:15Z | 2021-07-09T21:15:08 | CVE Published Date | updated |
| 2022-12-05 05:43:23 | 2021-07-14T14:57:33 | CVE Modified Date | updated | |
| 2022-12-05 05:43:23 | Analyzed | Vulnerability Status | updated |