CVE-2021-21265
October CMS Host Header Poisoning Vulnerability
Description
October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. In October before version 1.1.2, when running on poorly configured servers (i.e. the server routes any request, regardless of the HOST header to an October CMS instance) the potential exists for Host Header Poisoning attacks to succeed. This has been addressed in version 1.1.2 by adding a feature to allow a set of trusted hosts to be specified in the application. As a workaround one may set the configuration setting cms.linkPolicy to force.
INFO
Published Date :
March 10, 2021, 10:15 p.m.
Last Modified :
May 30, 2025, 12:15 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] |
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-21265.
| URL | Resource |
|---|---|
| https://github.com/octobercms/library/commit/f29865ae3db7a03be7c49294cd93980ec457f10d | |
| https://github.com/octobercms/library/commit/f86fcbcd066d6f8b939e8fe897409d152b11c3c6 | Patch Third Party Advisory |
| https://github.com/octobercms/october/commit/555ab61f2313f45d7d5d138656420ead536c5d30 | |
| https://github.com/octobercms/october/commit/f638d3f78cfe91d7f6658820f9d5e424306a3db0 | Patch Third Party Advisory |
| https://github.com/octobercms/october/security/advisories/GHSA-xhfx-hgmf-v6vp | Patch Third Party Advisory |
| https://packagist.org/packages/october/backend | |
| https://github.com/octobercms/library/commit/f86fcbcd066d6f8b939e8fe897409d152b11c3c6 | Patch Third Party Advisory |
| https://github.com/octobercms/october/commit/f638d3f78cfe91d7f6658820f9d5e424306a3db0 | Patch Third Party Advisory |
| https://github.com/octobercms/october/security/advisories/GHSA-xhfx-hgmf-v6vp | Patch Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-21265 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-21265
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-21265 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-21265 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 30, 2025
Action Type Old Value New Value Added Reference https://github.com/octobercms/library/commit/f29865ae3db7a03be7c49294cd93980ec457f10d Added Reference https://github.com/octobercms/october/commit/555ab61f2313f45d7d5d138656420ead536c5d30 Added Reference https://packagist.org/packages/october/backend -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://github.com/octobercms/library/commit/f86fcbcd066d6f8b939e8fe897409d152b11c3c6 Added Reference https://github.com/octobercms/october/commit/f638d3f78cfe91d7f6658820f9d5e424306a3db0 Added Reference https://github.com/octobercms/october/security/advisories/GHSA-xhfx-hgmf-v6vp -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Mar. 18, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:N/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Changed Reference Type https://github.com/octobercms/library/commit/f86fcbcd066d6f8b939e8fe897409d152b11c3c6 No Types Assigned https://github.com/octobercms/library/commit/f86fcbcd066d6f8b939e8fe897409d152b11c3c6 Patch, Third Party Advisory Changed Reference Type https://github.com/octobercms/october/commit/f638d3f78cfe91d7f6658820f9d5e424306a3db0 No Types Assigned https://github.com/octobercms/october/commit/f638d3f78cfe91d7f6658820f9d5e424306a3db0 Patch, Third Party Advisory Changed Reference Type https://github.com/octobercms/october/security/advisories/GHSA-xhfx-hgmf-v6vp No Types Assigned https://github.com/octobercms/october/security/advisories/GHSA-xhfx-hgmf-v6vp Patch, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:octobercms:october:*:*:*:*:*:*:*:* versions up to (excluding) 1.1.2
Vulnerability Scoring Details
Base CVSS Score: 7.5
Base CVSS Score: 4.3
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.47 }} 0.18%
score
0.63498
percentile