CVE-2021-3909— Infinite open connection causes OctoRPKI to hang forever
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I. Basic Information for CVE-2021-3909
Vulnerability Information
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Vulnerability Title
Infinite open connection causes OctoRPKI to hang forever
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Cloudflare OctoRPKI 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cloudflare OctoRPKI是美国cloudflare（Cloudflare）的Cloudflare平台的RPKI工具箱。 Cloudflare OctoRPKI 存在安全漏洞，攻击者可以发送慢速DOS攻击，这使得OctoRPKI一直处于等待状态。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Cloudflare | octorpki | unspecified ~ 1.4.0 | - |
II. Public POCs for CVE-2021-3909
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Cloudflare · 2021-11-11 · 6 CVEs total
| CVE-2021-3907 | 7.4 HIGH | Arbitrary filepath traversal via URI injection |
| CVE-2021-3908 | 5.9 MEDIUM | Infinite certificate chain depth results in OctoRPKI running forever |
| CVE-2021-3910 | 4.4 MEDIUM | NUL character in ROA causes OctoRPKI to crash |
| CVE-2021-3912 | 4.2 MEDIUM | OctoRPKI crashes when processing GZIP bomb returned via malicious repository |
| CVE-2021-3911 | 4.2 MEDIUM | Misconfigured IP address field in ROA leads to OctoRPKI crash |
IV. Related Vulnerabilities
Same product: octorpki
- CVE-2021-3978
Improper Preservation of Permissions in github.com/cloudflar - CVE-2022-3616
OctoRPKI crash when maximum iterations number is reached - CVE-2021-3912
OctoRPKI crashes when processing GZIP bomb returned via mali - CVE-2021-3911
Misconfigured IP address field in ROA leads to OctoRPKI cras - CVE-2021-3910
NUL character in ROA causes OctoRPKI to crash
Same vendor: Cloudflare
- CVE-2026-2836
Cache poisoning via insecure-by-default cache key - CVE-2026-2835
HTTP Request Smuggling via HTTP/1.0 and Transfer-Encoding Mi - CVE-2026-2833
HTTP Request Smuggling via Premature Upgrade - CVE-2026-1229
Incorrect calculation in CIRCL secp384r1 CombinedMult - CVE-2026-0933
OS Command Injection in `wrangler pages deploy`
Same weakness: CWE-400
- CVE-2026-8187
Open5GS UPF gtp-path.c _gtpv1_u_recv_cb resource consumption - CVE-2026-42343
FastGPT: Uncontrolled Resource Consumption leading to Sandbo - CVE-2026-42212
SolidCAM-GPPL-IDE: XML External Entity (XXE) and billion-lau - CVE-2026-32686
Unbounded exponent in decimal enables unauthenticated DoS - CVE-2026-20188
Cisco Crosswork Network Controller and Cisco Network Service
V. Comments for CVE-2021-3909
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