CVE-2021-3761
CVSS V2 Medium 5
CVSS V3 High 7.5
Description
Any CA issuer in the RPKI can trick OctoRPKI prior to 1.3.0 into emitting an invalid VRP "MaxLength" value, causing RTR sessions to terminate. An attacker can use this to disable RPKI Origin Validation in a victim network (for example AS 13335 - Cloudflare) prior to launching a BGP hijack which during normal operations would be rejected as "RPKI invalid". Additionally, in certain deployments RTR session flapping in and of itself also could cause BGP routing churn, causing availability issues.
Overview
- CVE ID
- CVE-2021-3761
- Assigner
- cna@cloudflare.com
- Vulnerability Status
- Analyzed
- Published Version
- 2021-09-09T14:15:09
- Last Modified Date
- 2022-04-04T13:41:19
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:a:cloudflare:octorpki:*:*:*:*:*:*:*:* | 1 | OR | 1.3.0 | |
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | 1 | OR |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:L/Au:N/C:N/I:N/A:P
- Access Vector
- NETWORK
- Access Compatibility
- LOW
- Authentication
- NONE
- Confidentiality Impact
- NONE
- Integrity Impact
- NONE
- Availability Impact
- PARTIAL
- Base Score
- 5
- Severity
- MEDIUM
- Exploitability Score
- 10
- Impact Score
- 2.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Attack Vector
- NETWORK
- Attack Compatibility
- LOW
- Privileges Required
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- NONE
- Availability Impact
- HIGH
- Base Score
- 7.5
- Base Severity
- HIGH
- Exploitability Score
- 3.9
- Impact Score
- 3.6
References
| Reference URL | Reference Tags |
|---|---|
| https://github.com/cloudflare/cfrpki/security/advisories/GHSA-c8xp-8mf3-62h9 | Patch Third Party Advisory |
| https://www.debian.org/security/2022/dsa-5041 | Third Party Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-3761 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3761 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 06:30:07 | Added to TrackCVE | |||
| 2022-12-05 10:14:40 | 2021-09-09T14:15Z | 2021-09-09T14:15:09 | CVE Published Date | updated |
| 2022-12-05 10:14:40 | 2022-04-04T13:41:19 | CVE Modified Date | updated | |
| 2022-12-05 10:14:40 | Analyzed | Vulnerability Status | updated |