Home/CVE/The net/http package improperly accepts a bare LF as a line terminator in chunked data chunk-size lines. This can permit
CVE
CVE-2025-22871
The net/http package improperly accepts a bare LF as a line terminator in chunked data chunk-size lines. This can permit
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.
CRITICAL · CVSS 9.1
EPSS 0.00294
Act now
- Public exploit or PoC is available
- SSVC automatable: yes - attacks can be scripted at scale
- CVSS base score ≥ 7.0
Sigma rules0
YARA rules0
Look this up elsewhere - one-click external pivots
▸
How to read a CVE - triage first, then detect and patch
This page is every public fact about CVE-2025-22871, cross-linked. Its job is to answer one question fast - does this need my attention now? - and then hand you the two things you do about it. Here is how an analyst reads it.
Triage: should I act now? Four signals, and they are not interchangeable:
CVSSseverity - how bad it is IF exploited, 0-10. A high CVSS alone is not urgency; a flaw can be a perfect 10 and never actually be attacked.
EPSSprobability - a model’s estimate of the chance it is exploited in the next 30 days, 0-1. This is the “will it actually happen” signal.
CISA KEVconfirmed - it is being exploited in the wild right now. The strongest signal on the page; KEV beats any score.
Weaponisedavailability - public exploits / PoCs, and especially Metasploit modules rated Excellent / Great. Reliable, packaged exploit code means low-skill attackers can use it today.
How they combine: KEV, or a dependable Metasploit module, means patch now regardless of CVSS. High CVSS + low EPSS + no exploit is real but not an emergency - schedule it. Low CVSS but KEV-listed still gets patched now. The verdict above already weighed these for you; this is how it got there.
Then what - two workflows:
Detectwhen you cannot patch today, follow this CVE to the ATT&CK techniques it enables, then Build a SIEM detection (the green button) - author a rule, test it in Atomic, deploy it. That buys visibility while the patch waits.
PatchAffected products / packages tell you if you are exposed; Fixed versions by distribution and Vendor advisories give the exact version that closes it.
Reading order for the panels below: verdict + badges, then Public exploits / Metasploit (is it weaponised), then ATT&CK techniques + Sigma / IDS rules (can I detect it), then Affected products / packages + Fixed versions (am I exposed, what patches it), then Threat actors / IOCs (who uses it), then Scoring & timeline / references (the evidence).
◆
ATT&CK techniques
1Techniques this CVE enables - linked via CWECAPECATT&CK. High◆ = named directly in ATT&CK or Nuclei templates.
▤ Build a SIEM detection for these techniques▤
Affected Packages
2Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Go
stdlib
fixed in 1.23.8, 1.24.2
Packagist
spiral/roadrunner
CRITICAL
fixed in 2025.1.0
⚠
Public Exploits & PoCs
10These PoC and exploit links come from public sources and are not verified to be safe or functional. Review the code before running anything, and treat unverified entries as untrusted.
📦
Fixed versions by distribution
80The package version that resolves this CVE on each Linux distribution, from the vendor’s published security data. fixed in shows a patched version exists; open means the package is listed as affected with no fix yet.
alpine edgego fixed in 1.24.2-r0
oracle allaardvark-dns fixed in 2:1.10.1-2.module+el8.10.0+90618+4905d84b
oracle allbuildah fixed in 2:1.39.4-2.0.1.el9_6
oracle allbuildah-tests open
oracle allcockpit-podman fixed in 0:84.1-1.module+el8.10.0+90618+4905d84b
oracle allconmon open
oracle allcontainer-selinux fixed in 2:2.229.0-2.module+el8.10.0+90618+4905d84b
oracle allcontainernetworking-plugins fixed in 1:1.6.2-2.el9_6
oracle allcontainers-common fixed in 2:1-82.0.1.module+el8.10.0+90618+4905d84b
oracle allcrit open
oracle allcriu fixed in 0:3.18-5.module+el8.10.0+90618+4905d84b
oracle allcriu-devel fixed in 0:3.18-5.module+el8.10.0+90618+4905d84b
oracle allcriu-libs open
oracle allcrun open
oracle alldelve open
oracle allfuse-overlayfs open
oracle allgit-lfs open
oracle allgo-toolset fixed in 0:1.23.9-1.el9_6
oracle allgolang fixed in 0:1.23.9-1.el9_6
oracle allgolang-bin open
oracle allgolang-docs fixed in 0:1.23.9-1.el9_6
oracle allgolang-misc fixed in 0:1.23.9-1.el9_6
oracle allgolang-race open
oracle allgolang-src fixed in 0:1.23.9-1.el9_6
oracle allgolang-tests fixed in 0:1.23.9-1.el9_6
oracle allgrafana open
oracle allgrafana-pcp fixed in 0:5.1.1-11.el9_6
oracle allgrafana-selinux open
oracle allgvisor-tap-vsock open
oracle allgvisor-tap-vsock-gvforwarder open
oracle allipp-usb fixed in 0:0.9.27-3.el10_0
oracle alllibslirp open
oracle alllibslirp-devel open
oracle allnetavark fixed in 2:1.10.3-1.module+el8.10.0+90618+4905d84b
oracle alloci-seccomp-bpf-hook fixed in 0:1.2.10-1.module+el8.10.0+90618+4905d84b
oracle allosbuild-composer open
oracle allosbuild-composer-core open
oracle allosbuild-composer-worker open
oracle allpodman fixed in 5:5.4.0-10.0.1.el9_6
oracle allpodman-catatonit open
oracle allpodman-docker open
oracle allpodman-gvproxy open
oracle allpodman-plugins fixed in 5:5.4.0-10.0.1.el9_6
oracle allpodman-remote open
oracle allpodman-tests fixed in 5:5.4.0-10.0.1.el9_6
oracle allpython3-criu fixed in 0:3.18-5.module+el8.10.0+90618+4905d84b
oracle allpython3-podman fixed in 0:4.9.0-3.module+el8.10.0+90618+4905d84b
oracle allrunc open
oracle allskopeo open
oracle allskopeo-tests open
oracle allslirp4netns open
oracle alludica open
oracle allweldr-client fixed in 0:35.12-4.el9_6
rhel 8aardvark-dns fixed in 2:1.10.1-2.module+el8.10.0+23250+94af2c8e
rhel 8buildah open
rhel 8buildah-tests open
rhel 8cockpit-podman open
rhel 8conmon fixed in 3:2.1.10-1.module+el8.10.0+23250+94af2c8e
rhel 8container-selinux fixed in 2:2.229.0-2.module+el8.10.0+23250+94af2c8e
rhel 8containernetworking-plugins open
rhel 8containers-common fixed in 2:1-82.module+el8.10.0+23250+94af2c8e
rhel 8crit fixed in 0:3.18-5.module+el8.10.0+23250+94af2c8e
rhel 8criu fixed in 0:3.18-5.module+el8.10.0+23250+94af2c8e
rhel 8criu-devel fixed in 0:3.18-5.module+el8.10.0+23250+94af2c8e
rhel 8criu-libs fixed in 0:3.18-5.module+el8.10.0+23250+94af2c8e
rhel 8crun fixed in 0:1.14.3-2.module+el8.10.0+23250+94af2c8e
rhel 8delve fixed in 0:1.24.1-1.module+el8.10.0+22945+b2c96a17
rhel 8fuse-overlayfs fixed in 0:1.13-1.module+el8.10.0+23250+94af2c8e
rhel 8git-lfs fixed in 0:3.4.1-5.el8_10
rhel 8go-toolset fixed in 0:1.23.9-1.module+el8.10.0+23162+9223a61a
rhel 8golang fixed in 0:1.23.9-1.module+el8.10.0+23162+9223a61a
rhel 8golang-bin fixed in 0:1.23.9-1.module+el8.10.0+23162+9223a61a
rhel 8golang-docs fixed in 0:1.23.9-1.module+el8.10.0+23162+9223a61a
rhel 8golang-misc open
rhel 8golang-src open
rhel 8golang-tests open
rhel 8grafana fixed in 0:9.2.10-25.el8_10
rhel 8grafana-pcp fixed in 0:5.1.1-10.el8_10
rhel 8grafana-selinux open
rhel 8libslirp open
▣
Scoring & Timeline
9.1
CRITICAL · CVSS v3.1 · [email protected]
Attack Vector
Network
Adjacent
Local
Physical
Attack Complexity
Low
High
Privileges Required
None
Low
High
User Interaction
None
Required
Scope
Unchanged
Changed
Confidentiality
None
Low
High
Integrity
None
Low
High
Availability
None
Low
High
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑
Vendor Advisories
30cisa-aa-advisoriesicsa-26-134-14
siemens-csafSSA-783943
msrcCVE-2025-22871
suse-csafSUSE-SU-2025:03159-1
🔗
References & Sources
6Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.