Critical severity · published Apr 8, 2025
CVE-2025-22871
Request smuggling due to acceptance of invalid chunked data in net/http
9.1
CVSS
0.8%
EPSS
No
On KEV
Description
The net/http package improperly accepts a bare LF as a line terminator in chunked data chunk-size lines. This can permit request smuggling if a net/http server is used in conjunction with a server that incorrectly accepts a bare LF as part of a chunk-ext.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 57% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NE
net/http/internal · Go standard library
before 1.23.8; 1.24.0-0 before 1.24.2 · source: vendor
S7
SENTRON 7KT PAC1261 Data Manager · Siemens
before V2.1.0 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-22871
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-22871
go.dev
https://go.dev/cl/652998
go.dev
https://go.dev/issue/71988
groups.google.com
https://groups.google.com/g/golang-announce/c/Y2uBTVKjBQk
pkg.go.dev
https://pkg.go.dev/vuln/GO-2025-3563
www.openwall.com
http://www.openwall.com/lists/oss-security/2025/04/04/4
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/html/ssa-783943.html