HIGH
CVE-2021-4204
CWE-20Published: August 24, 2022· Updated: Jun 17, 2026
7.1
CVSS v3.1
Official Description
An out-of-bounds (OOB) memory access flaw was found in the Linux kernel's eBPF due to an Improper Input Validation. This flaw allows a local attacker with a special privilege to crash the system or leak internal information.
Technical Analysis
CVE-2021-4204 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A successful exploit results in complete confidentiality breach (data exposure), availability disruption (denial of service), with a CVSS base score of 7.1.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Affected Vendors & Products
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (10)
→
https://access.redhat.com/security/cve/CVE-2021-4204Mitigation · Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=2039178Issue Tracking · Third Party Advisory
→
https://security-tracker.debian.org/tracker/CVE-2021-4204Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20221228-0003/Third Party Advisory
→
https://www.openwall.com/lists/oss-security/2022/01/11/4Mailing List · Patch · Third Party Advisory
→
https://access.redhat.com/security/cve/CVE-2021-4204Mitigation · Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=2039178Issue Tracking · Third Party Advisory
→
https://security-tracker.debian.org/tracker/CVE-2021-4204Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20221228-0003/Third Party Advisory
→
https://www.openwall.com/lists/oss-security/2022/01/11/4Mailing List · Patch · Third Party Advisory
Quick Facts
CVE IDCVE-2021-4204
CVSS Score7.1 / 10
SeverityHIGH
WeaknessCWE-20
CISA KEVNo
Affected4 vendor(s)
PublishedAug 24, 2022
Related CVEs (CWE-20)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-4204 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.