// For flags

CVE-2021-3909

Infinite open connection causes OctoRPKI to hang forever

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

OctoRPKI does not limit the length of a connection, allowing for a slowloris DOS attack to take place which makes OctoRPKI wait forever. Specifically, the repository that OctoRPKI sends HTTP requests to will keep the connection open for a day before a response is returned, but does keep drip feeding new bytes to keep the connection alive.

OctoRPKI no limita la duración de una conexión, permitiendo que se produzca un ataque slowloris DOS que hace que OctoRPKI espere eternamente. En concreto, el repositorio al que OctoRPKI envía peticiones HTTP mantendrá la conexión abierta durante un día antes de que se devuelva una respuesta, pero sigue alimentando con nuevos bytes para mantener viva la conexión

Multiple vulnerabilities were discovered in Cloudflare's RPKI validator, which could result in denial of service or path traversal.

*Credits: Koen van Hove
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-10-26 CVE Reserved
  • 2021-11-11 CVE Published
  • 2024-09-16 CVE Updated
  • 2025-05-07 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-400: Uncontrolled Resource Consumption
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Cloudflare
Search vendor "Cloudflare"
 Octorpki
Search vendor "Cloudflare" for product "Octorpki"
 < 1.3.0
Search vendor "Cloudflare" for product "Octorpki" and version " < 1.3.0"
-
Affected
Debian
Search vendor "Debian"
 Debian Linux
Search vendor "Debian" for product "Debian Linux"
 11.0
Search vendor "Debian" for product "Debian Linux" and version "11.0"
-
Affected