CVE-2021-3907

Octorpki vulnerability

CVSS

7.4

EPSS

4.1%

EPSS pct

90th

Exploited

No known

OctoRPKI does not escape a URI with a filename containing "..", this allows a repository to create a file, (ex. rsync://example.org/repo/../../etc/cron.daily/evil.roa), which would then be written to disk outside the base cache folder. This could allow for remote code execution on the host machine OctoRPKI is running on.

Affected vendor

Cloudflare

Affected product

Octorpki

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H

Weakness type (CWE)

CWE-20 — Improper Input Validation
CWE-22 — Path Traversal

Published

2021-11-11

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, high attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to integrity, high impact to availability.

Its EPSS score of 4.1% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 90% of all scored CVEs.

Check your external exposure to CVE-2021-3907

Confirm whether Cloudflare Octorpki is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2021-3907.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-3907

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-3907 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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