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CVE-2023-27539

MEDIUM
Published 2025-01-09T00:33:47.737Z
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CVSS Score

V3.1
5.3
/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.002
probability
of exploitation in the wild

There is a 0.2% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.453
Higher than 45.3% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
LOW
Integrity
NONE
Availability
NONE

Description

There is a denial of service vulnerability in the header parsing component of Rack.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

Rails

Rack

Affected Versions:

2.2.6.4 3.0.6.1

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

✓ GitHub Reviewed LOW

Possible Denial of Service Vulnerability in Rack's header parsing

GHSA-c6qg-cjj8-47qp

Advisory Details

There is a denial of service vulnerability in the header parsing component of Rack. This vulnerability has been assigned the CVE identifier CVE-2023-27539. Versions Affected: >= 2.0.0 Not affected: None. Fixed Versions: 2.2.6.4, 3.0.6.1 # Impact Carefully crafted input can cause header parsing in Rack to take an unexpected amount of time, possibly resulting in a denial of service attack vector. Any applications that parse headers using Rack (virtually all Rails applications) are impacted. # Workarounds Setting Regexp.timeout in Ruby 3.2 is a possible workaround.

Affected Packages

RubyGems rack
ECOSYSTEM: ≥2.0.0 <2.2.6.4
RubyGems rack
ECOSYSTEM: ≥3.0.0 <3.0.6.1

CVSS Scoring

CVSS Score

2.5

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2023-27539
WEB https://github.com/rack/rack/commit/231ef369ad0b542575fb36c74fcfcfabcf6c530c
WEB https://github.com/rack/rack/commit/ee7919ea04303717858be1c3f16b406adc6d8cff
WEB https://discuss.rubyonrails.org/t/cve-2023-27539-possible-denial-of-service-vulnerability-in-racks-header-parsing/82466
PACKAGE https://github.com/rack/rack
WEB https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2023-27539.yml
WEB https://lists.debian.org/debian-lts-announce/2023/04/msg00017.html
WEB https://security.netapp.com/advisory/ntap-20231208-0016
WEB https://www.debian.org/security/2023/dsa-5530

Advisory provided by GitHub Security Advisory Database. Published: March 15, 2023, Modified: January 9, 2025

References

https://discuss.rubyonrails.org/t/cve-2023-27539-possible-denial-of-service-vulnerability-in-racks-header-parsing/82466
https://github.com/advisories/GHSA-c6qg-cjj8-47qp
https://github.com/rack/rack/commit/231ef369ad0b542575fb36c74fcfcfabcf6c530c
https://github.com/rack/rack/commit/ee7919ea04303717858be1c3f16b406adc6d8cff
https://lists.debian.org/debian-lts-announce/2023/04/msg00017.html
https://security.netapp.com/advisory/ntap-20231208-0016/
https://www.debian.org/security/2023/dsa-5530

HackerOne Reports

[CVE-2023-27539] Possible Denial of Service Vulnerability in Rack’s header parsing Medium
ooooooo_q
Internet Bug Bounty
$2540.00
View Report
Published: 2025-01-09T00:33:47.737Z
Last Modified: 2025-01-09T21:24:51.396Z
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