HIGH
CVE-2021-3905
CWE-401Published: August 23, 2022· Updated: Jun 17, 2026
7.5
CVSS v3.1
Official Description
A memory leak was found in Open vSwitch (OVS) during userspace IP fragmentation processing. An attacker could use this flaw to potentially exhaust available memory by keeping sending packet fragments.
Technical Analysis
CVE-2021-3905 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Vendors & Products
Canonical1 product(s)
ubuntu linux
Fedora1 product(s)
fedora
openvswitch1 product(s)
openvswitch
Red Hat1 product(s)
enterprise linux fast datapath
Source: NVD CPE · 5 total CPE entries
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 (12)
→
https://access.redhat.com/security/cve/CVE-2021-3905Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=2019692Issue Tracking · Patch · Third Party Advisory
→
https://github.com/openvswitch/ovs-issues/issues/226Exploit · Issue Tracking · Patch · Third Party Advisory
→
https://github.com/openvswitch/ovs/commit/803ed12e31b0377c37d7aa8c94b3b92f2081e349Patch · Third Party Advisory
→
https://ubuntu.com/security/CVE-2021-3905Patch · Third Party Advisory
→
https://access.redhat.com/security/cve/CVE-2021-3905Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=2019692Issue Tracking · Patch · Third Party Advisory
→
https://github.com/openvswitch/ovs-issues/issues/226Exploit · Issue Tracking · Patch · Third Party Advisory
→
https://github.com/openvswitch/ovs/commit/803ed12e31b0377c37d7aa8c94b3b92f2081e349Patch · Third Party Advisory
→
https://ubuntu.com/security/CVE-2021-3905Patch · Third Party Advisory
Quick Facts
CVE IDCVE-2021-3905
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-401
CISA KEVNo
Affected4 vendor(s)
PublishedAug 23, 2022
Related CVEs (CWE-401)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-3905 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.COM. CVE data is provided under the NVD usage policy.