Medium severity · published Jan 9, 2025
CVE-2023-27539
There is a denial of service vulnerability in the header parsing component of Rack
5.3
CVSS
1.1%
EPSS
No
On KEV
Description
There is a denial of service vulnerability in the header parsing component of Rack.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 64% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RA
Rack · Rails
2.2.6.4 before 2.2.6.4; 3.0.6.1 before 3.0.6.1 · source: vendor, NVD
DL
Debian Linux · Debian
10.0; 11.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-27539
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-27539
Vendor Advisory
https://discuss.rubyonrails.org/t/cve-2023-27539-possible-denial-of-service-vulnerability-in-racks-header-parsing/82466
Patch
https://github.com/advisories/GHSA-c6qg-cjj8-47qp
Patch
https://github.com/rack/rack/commit/231ef369ad0b542575fb36c74fcfcfabcf6c530c
Patch
https://github.com/rack/rack/commit/ee7919ea04303717858be1c3f16b406adc6d8cff
Mailing List
https://lists.debian.org/debian-lts-announce/2023/04/msg00017.html
Third Party Advisory
https://security.netapp.com/advisory/ntap-20231208-0016/