CVE-2023-27539
Rack Denial of Service Vulnerability
Description
There is a denial of service vulnerability in the header parsing component of Rack.
INFO
Published Date :
Jan. 9, 2025, 1:15 a.m.
Last Modified :
Oct. 10, 2025, 4:31 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2023-27539
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update the Rack component to the latest version.
- Review Rack's header parsing logic for improvements.
Public PoC/Exploit Available at Github
CVE-2023-27539 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
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-2023-27539.
| URL | Resource |
|---|---|
| https://discuss.rubyonrails.org/t/cve-2023-27539-possible-denial-of-service-vulnerability-in-racks-header-parsing/82466 | Vendor Advisory |
| https://github.com/advisories/GHSA-c6qg-cjj8-47qp | Third Party Advisory Patch |
| https://github.com/rack/rack/commit/231ef369ad0b542575fb36c74fcfcfabcf6c530c | Patch |
| https://github.com/rack/rack/commit/ee7919ea04303717858be1c3f16b406adc6d8cff | Patch |
| https://lists.debian.org/debian-lts-announce/2023/04/msg00017.html | Mailing List Third Party Advisory |
| https://security.netapp.com/advisory/ntap-20231208-0016/ | Third Party Advisory |
| https://www.debian.org/security/2023/dsa-5530 | Mailing List 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-2023-27539 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-2023-27539
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).
None
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2023-27539 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2023-27539 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.
-
Initial Analysis by [email protected]
Oct. 10, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:a:rack:rack:*:*:*:*:*:ruby:*:* versions from (including) 2.0.0 up to (excluding) 2.2.6.4 *cpe:2.3:a:rack:rack:*:*:*:*:*:ruby:*:* versions from (including) 3.0.0 up to (excluding) 3.0.6.1 Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Added Reference Type HackerOne: https://discuss.rubyonrails.org/t/cve-2023-27539-possible-denial-of-service-vulnerability-in-racks-header-parsing/82466 Types: Vendor Advisory Added Reference Type HackerOne: https://github.com/advisories/GHSA-c6qg-cjj8-47qp Types: Patch, Third Party Advisory Added Reference Type HackerOne: https://github.com/rack/rack/commit/231ef369ad0b542575fb36c74fcfcfabcf6c530c Types: Patch Added Reference Type HackerOne: https://github.com/rack/rack/commit/ee7919ea04303717858be1c3f16b406adc6d8cff Types: Patch Added Reference Type HackerOne: https://lists.debian.org/debian-lts-announce/2023/04/msg00017.html Types: Mailing List, Third Party Advisory Added Reference Type HackerOne: https://security.netapp.com/advisory/ntap-20231208-0016/ Types: Third Party Advisory Added Reference Type HackerOne: https://www.debian.org/security/2023/dsa-5530 Types: Mailing List, Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jan. 09, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N -
New CVE Received by [email protected]
Jan. 09, 2025
Action Type Old Value New Value Added Description There is a denial of service vulnerability in the header parsing component of Rack. Added Reference https://discuss.rubyonrails.org/t/cve-2023-27539-possible-denial-of-service-vulnerability-in-racks-header-parsing/82466 Added Reference https://github.com/advisories/GHSA-c6qg-cjj8-47qp Added Reference https://github.com/rack/rack/commit/231ef369ad0b542575fb36c74fcfcfabcf6c530c Added Reference https://github.com/rack/rack/commit/ee7919ea04303717858be1c3f16b406adc6d8cff Added Reference https://lists.debian.org/debian-lts-announce/2023/04/msg00017.html Added Reference https://security.netapp.com/advisory/ntap-20231208-0016/ Added Reference https://www.debian.org/security/2023/dsa-5530